- Units & Notation
- Moles per litre
- Grams per litre
- Percent solutions
- Parts per million
- Practice problems
Moles per litre
Activity 1
Find the molarity of a solution in which 80g of sodium hydroxide (NaOH) is dissolved in 1 litre of solution.
Try to attempt this problem yourself. You may wish to follow the steps identified in the example provided in the previous section to solve problems like these. Type-in your answer (digits only) in the text box given below and then check your answer by clicking the 'Check Answer' link button.
M r for NaOH is approximately 40 and remembering the formula:
the amount of solute in moles is 80 ÷ 40 = 2 moles.
As formula for determining molarity or concentration of a solution is:
therefore by placing the values in the formula we get 2 moles ÷ 1 Litre = 2M
If you have got the answer right then try Activity 2, or else the video below shows a detailed step by step approach to solve the above problem.
This video contains sound.
