ChemDigiT is a chemical calculator. No approximations made. All calculated variables show their exact values. The algorithm used for calculations is based on a full set of equations describing acid/base and salt dissociation equlibrium solved with Newton–Raphson method.
- pH Acid-Base Section
Find exact pH and equilibrium concentrations of all dissociated and undissociated species of any solution of strong/weak/polyprotic acid and base. Built-in database of over 60 weak acids and bases with pka and pkb editable tables
- pH Hydrolysis Section
Find exact pH and equilibrium concentrations of all dissociated and undissociated species of any solution of salt.
- pH Mixtures Section
Find exact pH and equilibrium concentrations of all dissociated and undissociated species of any mixture of two acids or two bases
- Titration Section
Trace titration curve and find pH and volume of titrant added at equivalent points of any combination of strong/weak acid-base
- Balance Section
Balance chemical equations (max 8 reagents and 8 products). If Weight or mole of one specie is entered, amounts of all reagents and products will be calculated. If more than one value is entered, then ChemDigiT checks if there is a limiting reagent. If so this value is used for the stoichiometric calculation.
- Concentration Section
Calculate and convert concentration (molarity, molality, percent concentrations and molar fractions). All calculations will automatically take solution density into account. Built-in editable database of over 300 compounds with density tables Calculator for dilution and solution mixing calculations.
- Buffer Section
Calculate A) buffer composition (acid and conjugated base concentration) or B) desired pH and total concentration. ChemDigiT doesn't use Henderson-Hasselbach equation, but exactly solves a sixth degree equation. Ionic Strength option to consider activities. Davies equation parameters editable. Calculate new pH after addition of strong acid/base.
- Solubility Section
Calculate solubility, pH and Ionic Strength of any solution of poorly soluble strong electrolyte. Built-in editable database of over 120 compounds with Solubility Product Constants. Evaluate effects of Hydrolysis (Anion), pH and Ionic Strength on the Solubility
Source : http://rodomontano.altervista.org/chemdigit.php
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