Chemistry tools
Solution chemistry, gases, and composition calculators
- formula calculator
Activation energy from two (k, T) points
Ea from ln(k₂/k₁) and two temperatures.
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Actual yield calculator
Back-calculate actual yield from theoretical yield and percent yield.
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AI concept explainer (roadmap)
Planned tutoring-style explanations by topic.
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AI equation balancer (roadmap)
Planned AI feature — use the integer reaction balance tool today.
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AI lab assistant (roadmap)
Planned protocol checklists from summaries.
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AI MCQ generator (roadmap)
Planned topic-based MCQs with explanations.
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AI mechanism explainer (roadmap)
Planned curved-arrow walkthroughs.
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AI reaction predictor (roadmap)
Planned AI feature — use mechanism and functional-group hints for study.
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AI study planner (roadmap)
Planned adaptive schedules — use revision planner spacing today.
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Alkane isomer count
Tabulated constitutional isomer counts for C_nH_{2n+2}, n = 1–10.
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Alkane name to formula
Choose a parent alkane name and get condensed formula C_nH_{2n+2}.
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Arrhenius equation calculator
k = A exp(−Ea/RT); solve k, Ea, T, or A (Ea in kJ/mol in the form).
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Atomic mass lookup
Look up standard atomic weight (g/mol) by element symbol.
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Atomic radius comparison
Compare tabulated covalent radii (H–Xe subset) for two elements.
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Attempt analyzer
Accuracy and guessed negative marking impact.
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Battery efficiency calculator
Round-trip or energy efficiency η = 100 × (useful out / energy in) with consistent units.
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Boiling point elevation calculator
ΔT_b from molality, van’t Hoff factor i, and K_b (ebullioscopic constant).
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Bond energy calculator
Estimate ΔH from totals of bond dissociation energies broken minus bonds formed.
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Boyle’s law calculator
P₁V₁ = P₂V₂ at constant temperature and amount.
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Buffer capacity calculator
Approximate β ≈ 2.303 [HA][A⁻]/([HA]+[A⁻]) in mol/L per pH unit.
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Buffer solution calculator
pH of a buffer from K_a, [HA], and [A⁻] (Henderson–Hasselbalch).
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Calorimetry calculator
Heat from a calorimeter constant and measured ΔT: Q = C_cal · ΔT.
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Cell potential calculator
E_cell = E_cathode(reduction) − E_anode(reduction) from two half-cell potentials.
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Charge required calculator
Coulombs needed for a target amount: Q = n · n_e · F.
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Charles’s law calculator
V₁/T₁ = V₂/T₂ at constant pressure; T in kelvin.
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Chemical production rate
Production from batch size and batch time (toy rate).
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Chemical storage compatibility
Rough incompatible-pair hints for common lab families.
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Chemistry formula sheet
Copy-friendly list of common formulas by topic.
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Combined gas law calculator
P₁V₁/T₁ = P₂V₂/T₂ — solve for any one state variable.
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Concentration calculator
Molarity (M), mass concentration (g/L), or mass percent (% w/w) in one tool.
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Coordination number → geometry
Typical geometry name for CN 1–12.
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Cost estimation (materials)
Raw material cost from unit price and mass.
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Crystal field (octahedral dⁿ)
High vs low spin using Δo/P for d⁴–d⁷; d¹–d³, d⁸–d¹⁰ notes.
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Dalton’s law calculator
Total pressure from partial pressures or P_i = X_i P_total.
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Degree of unsaturation calculator
DBE from a molecular formula (halogens as H).
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Dilution calculator
Solve C₁V₁ = C₂V₂ for any missing concentration or volume (consistent units).
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Effective nuclear charge calculator
Z_eff = Z − σ with screening σ you supply (e.g. from Slater rules).
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Electrolysis mass calculator
Mass deposited or dissolved: m = (Q·M)/(n·F) with Q in coulombs.
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Electron configuration lookup
Ground-state configuration string for Z = 1–118 (teaching data).
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Electron shell summary
K/L/M… occupancy from atomic number.
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Electron transfer (moles e⁻)
Moles of electrons from |ΔOS| × moles of atoms.
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Element comparison
Side-by-side mass, EN, radius, configuration for two elements.
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Element property finder
Look up symbol, Z, mass, and configuration snippet.
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Empirical formula calculator
Empirical formula from mole amounts or from mass percent composition.
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Energy converter
J, kJ, and kcal (thermochemical).
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Enthalpy change calculator (ΔH from formation data)
Reaction enthalpy ΔH° from standard formation enthalpies: Σ ν ΔH_f°(products) − Σ ν ΔH_f°(reactants).
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Entropy change calculator (ΔS from S° data)
Reaction entropy ΔS° from standard molar entropies S° in J/(mol·K) for products and reactants.
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Equilibrium constant K_p and K_c calculator
Convert K_p ↔ K_c using Δn_gas and RT (gas-phase reactions).
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Equivalent weight calculator
Equivalent weight (g/eq) from molar mass and equivalents per mole.
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Exam cutoff check (toy)
Compare your toy score to a guessed cutoff.
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Excess reagent calculator
After reaction goes to completion, see how much of the non-limiting (excess) reactant remains.
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Faraday’s law (average EMF magnitude)
|ε|_avg = N |ΔΦ/Δt|.
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Flashcard prompts
Front/back prompts for spaced repetition.
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Formula to alkane name (linear)
If the formula is C_nH_{2n+2}, return the parent alkane name.
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Freezing point depression calculator
ΔT_f from molality, i, and K_f (cryoscopic constant).
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Functional group hints (formula)
Heuristic hints from DBE and heteroatoms — not identification.
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Gas density calculator
ρ = PM/(RT) in g/L from P (atm), M (g/mol), T (K).
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GATE chemistry score (weighted toy)
Weighted sections for rough composite — unofficial.
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Gay-Lussac’s law calculator
P₁/T₁ = P₂/T₂ at constant volume; T in kelvin.
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Gibbs free energy calculator (ΔG = ΔH − TΔS)
Gibbs energy change from ΔH (kJ/mol), ΔS (J/mol·K), and temperature in kelvin.
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Half-life calculator (0/1/2 order)
t½ for zeroth, first, or second order in a single reactant.
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Heat capacity calculator
C = Q/ΔT from measured heat and temperature change (J/K).
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Heat energy calculator (Q = mcΔT)
Heat in joules from mass (g), specific heat J/(g·K), and temperature change.
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Henderson–Hasselbalch calculator
Same buffer relation with pK_a and ratio [A⁻]/[HA] made explicit.
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Hess law calculator
Sum enthalpy steps with multipliers (reverse a step with −1, double it with 2, …).
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Hybridization from steric number
sp, sp², sp³ from VSEPR steric number 2–4.
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ICE table calculator
Solve x for A ⇌ B + C from K and initial [A]₀ (quadratic ICE).
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Ideal gas law calculator (PV = nRT)
Solve for P, V, n, or T with P in atm, V in L, T in K.
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Ideal gas moles calculator
Estimate moles from pressure (atm), volume (L), and temperature (K) using PV = nRT.
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Interactive periodic table
Browse Z, symbol, name, and atomic mass.
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Internal energy calculator (ΔU = q + w)
First law for a closed system: internal energy change from heat and work in joules.
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IUPAC linear alkane names
Parent names for unbranched alkanes C₁–C₂₀.
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JEE rank predictor (toy)
Logistic-style rank estimate from percentile — illustrative only.
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Lab dilution planner
Step dilutions or single-shot dilution from stock to target.
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Lattice energy estimator
Kapustinskii-type estimate from charges and ionic radii.
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Limiting reagent calculator
Find the limiting reactant for two species using moles and stoichiometric coefficients; shows extent and leftovers.
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Mass from moles calculator
Convert moles to grams using molar mass (g/mol).
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Molality calculator
Compute molality (mol/kg) from moles of solute and kilograms of solvent.
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Molarity ↔ molality
Relate M and m using solution density (kg/L) and solute molar mass.
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Molarity calculator
Find molarity (mol/L) from moles of solute and solution volume in liters.
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Mole ratio calculator
Mole ratio from balanced coefficients and optional conversion from moles of A to moles of B.
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Molecular formula calculator
Molecular formula from an empirical formula and experimental molar mass.
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Molecular geometry (VSEPR)
Same VSEPR engine with geometry-focused title.
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Molecular mass calculator
Molar mass (g/mol) from a molecular formula (parentheses and subscripts supported).
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Moles ↔ grams converter
Convert using molar mass (g/mol).
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Moles from mass calculator
Convert grams to moles using molar mass (g/mol).
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NEET chemistry score (weighted toy)
Weighted average across sections — not official scoring.
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Nernst equation calculator
Cell potential E from E°, n, T (K), and reaction quotient Q using E = E° − (RT/nF) ln Q.
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Neutralization calculator
Volume or mole balance for acid–base neutralization with optional stoichiometric z.
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Normality calculator
Calculate normality (eq/L) from equivalents and volume, or from molarity and equivalents per mole.
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Notes outline
Topic skeletons to expand into your own notes.
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Orbital diagram (one subshell)
Text boxes for one subshell with Hund’s rule and pairing.
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Osmotic pressure calculator
π = iMRT from molarity (mol/L), temperature (K), and i.
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Oxidation state calculator
One unknown element with default rules (O, H, F, group 1/2…).
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Oxidizing / reducing agent strength
Compare standard reduction potentials from a teaching table.
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Percent yield calculator
Percent yield from actual and theoretical yield (same units—grams or moles).
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Periodic trend (EN)
Compare Pauling electronegativity between two elements.
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pH calculator
pH from [H⁺] or [H⁺] from pH.
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pH from K_a calculator
Weak-acid pH from K_a and analytical concentration (common approximations).
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pOH calculator
pOH from [OH⁻] or [OH⁻] from pOH; optional pH at 25 °C.
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ppm ↔ mg/L
For dilute aqueous solutions using density ρ (g/mL).
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Pressure converter
atm, bar, and Pa.
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Process efficiency calculator
Mass or mole efficiency vs theoretical stoichiometry.
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Quantum number checker
Validate n, l, m_l, m_s and relate to subshell capacity.
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Raoult’s law calculator
Vapor pressure lowering P = X_solvent P° for ideal solutions.
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Rate law calculator
rate = k[A]^a[B]^b — solve rate, k, or a concentration.
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Reaction balance checker
Verify whether your integer coefficients and molecular formulas conserve each element (parses formulas like H2O, Ca(OH)2).
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Reaction conversion calculator
Percent conversion of a reactant from initial moles and either remaining moles or moles reacted.
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Reaction mechanism pattern guide
SN1, SN2, E1, E2 summary — not a structure-based predictor.
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Reaction order summary
Integrated laws and half-life formulas for orders 0–1–2 in [A].
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Reaction quotient Q calculator
Q from partial pressures or concentrations for aA + bB ⇌ cC + dD pattern.
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Reaction summary
Named reaction templates for organic revision.
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Reactor yield calculator
Conversion and selectivity → yield for A → P with side product.
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Reagent mixing calculator
Mix two solutions to an intermediate concentration (same solute).
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Redox electron balance (LCM)
Multipliers to match electrons between two half-reactions.
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Revision planner
Exam date and list of topics → spaced review dates.
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RMS molecular speed calculator
u_rms = √(3RT/M) with M in g/mol and T in K.
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Safety hazard hints
GHS-style pictogram reminders from keywords (not a substitute for SDS).
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Scale-up calculator
Linear geometric scale from pilot volume to plant volume.
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Solubility from K_sp calculator
Molar solubility s for simple stoichiometries from K_sp (e.g. MA, MA₂).
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Solubility product (K_sp) calculator
K_sp = [M⁺][A⁻] for MA(s) ⇌ M⁺ + A⁻ at saturation.
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Solution preparation calculator
Stock volume to pipette for a target molarity and final volume (dilution).
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Spectroscopy hints (IR / ¹H NMR)
Rough region tables — not spectrum simulation.
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Standard cell potential calculator
E°_cell from two standard reduction potentials E° (cathode − anode).
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Stoichiometry calculator
Convert mass of reactant A to mass of product or related species B using molar masses and balanced coefficients.
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Strong acid / strong base calculator
pH for strong monoprotic acid or pOH/pH for strong monobasic hydroxide.
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Temperature converter
Kelvin, °C, and °F.
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Theoretical yield calculator
Theoretical mass of product from moles of limiting reactant, coefficients, and product molar mass.
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Titration calculator
Equivalence V_a C_a = V_b C_b — solve for any one of the four (mono–mono).
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Titration curve (strong–strong)
pH vs volume for strong acid titrated with strong base (or swap).
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Van’t Hoff factor calculator
Solve i from measured colligative ΔT and K, m (or related combinations).
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VSEPR shape predictor
Molecular shape from bonding domains and lone pairs on central atom.
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Weak acid / weak base calculator
pH from K_a and C (acid) or pOH/pH from K_b and C (base).
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