Concentration (Moles) Calculator
Concentration in moles per unit volume.
Formula first
Overview
Molar concentration, often called molarity, defines the amount of a solute (measured in moles) per unit volume of the resulting solution. It is a fundamental calculation in stoichiometry that allows chemists to convert between the volume of a liquid mixture and the chemical quantity of the substance it contains.
Symbols
Variables
c = Concentration, n = Moles, V = Volume
Apply it well
When To Use
When to use: Apply this formula when you need to determine the strength of a solution or calculate the volume required for a specific chemical reaction. It is the standard method for expressing concentration in laboratory settings and titration analysis where volumes are easily measured.
Why it matters: Molar concentration ensures that chemical reactions are performed with precise ratios of reactants, which is vital for everything from manufacturing medicine to water treatment. Without accurate concentration calculations, reactions could be dangerous, ineffective, or economically wasteful.
Avoid these traps
Common Mistakes
- Using volume in cm³.
- Confusing with mass concentration.
One free problem
Practice Problem
A laboratory technician dissolves 0.5 moles of sodium chloride in enough water to create a total solution volume of 2.0 liters. Calculate the molar concentration of the solution.
Solve for:
Hint: Divide the amount of substance in moles by the total volume in liters.
The full worked solution stays in the interactive walkthrough.
References
Sources
- IUPAC Gold Book: Molar concentration
- Atkins' Physical Chemistry
- Wikipedia: Molar concentration
- IUPAC Gold Book
- IUPAC Gold Book (Amount Concentration)
- AQA GCSE Chemistry Specification
- Edexcel GCSE Chemistry — Quantitative Chemistry