Important Downloads
Online Chemistry Tools
The following free online calculators and reference tools are recommended for MS and PhD students at
DChy, PIEAS for use in coursework, laboratory preparation, and research calculations. All listed tools
are accessible directly in the browser with no installation required.
Solution Chemistry
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Molarity Calculator
— Calculate the molar concentration of a solution from solute mass, molar mass, and solution
volume. Essential for preparing standard solutions and serial dilutions in the laboratory.
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pH Calculator
— Determine pH, pOH, and the acidity or alkalinity of a solution from hydrogen ion concentration
[H⁺], hydroxide ion concentration [OH⁻], or direct pOH input. Useful for acid-base equilibrium
and buffer calculations.
Stoichiometry & Mass Calculations
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Molar Mass Calculator
— Compute moles, mass, or molar mass using the fundamental relation n = m / M. Indispensable for
stoichiometric calculations and accurate reagent preparation.
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Percent Yield Calculator
— Evaluate the efficiency of a chemical reaction by calculating percent yield from actual and
theoretical yield values. Widely used in synthetic and analytical chemistry.
Physical Chemistry
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Density Calculator
— Compute density, mass, or volume using ρ = m/V with support for multiple unit systems.
Applicable in material science, fluid mechanics, and physical chemistry experiments.
Reference Databases
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NIST Chemistry WebBook
— Authoritative thermochemical, thermophysical, and spectroscopic data for a large number of
chemical compounds, maintained by the National Institute of Standards and Technology (USA).
Widely used in research for obtaining standard property values.
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Wolfram Alpha — Chemistry
— Computational knowledge engine covering chemical formulas, reaction balancing, thermodynamic
properties, and molecular structure data. Useful for verifying calculations and exploring
chemical properties interactively.