Solutions in School Chemistry


This is a series of lectures in videos covering Chemistry topics commonly taught in schools.

Related Pages
Chemistry Lessons




Share this page to Google Classroom

There are several ways to calculate concentration in chemistry, depending on the type of concentration you’re dealing with and the information you have available. Here are the most common methods:

  1. Mass Concentration:
    Concentration units: grams per liter (g/L), milligrams per liter (mg/L), parts per million (ppm), etc.
    Formula: Concentration = Mass of solute / Volume of solution
    Example: You dissolve 5 grams of salt in 100 milliliters of water. What is the concentration of the salt solution?
    Concentration = 5 g / 0.1 L = 50 g/L

  2. Molar Concentration (Molarity):
    Concentration units: moles per liter (mol/L)
    Formula: Molarity = Moles of solute / Volume of solution (in liters)
    Example: You dissolve 10 grams of sodium hydroxide (NaOH) in water to make 250 milliliters of solution. What is the molarity of the solution?
    First, calculate the moles of NaOH: 10 g / 40 g/mol = 0.25 mol
    Then, calculate the molarity: 0.25 mol / 0.25 L = 1.0 mol/L

  3. Percent Concentration (Mass/Volume):
    Concentration units: percent weight per volume (% w/v)
    Formula: % w/v = (Mass of solute / Volume of solution) x 100%
    Example: You mix 20 grams of sugar with 100 milliliters of water. What is the percent concentration of sugar in the solution? % w/v = (20 g / 0.1 L) x 100% = 20%




Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
Mathway Calculator Widget



We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.