Question #10c19
1 Answer
You also need the percent composition of the solution. Here's how to do the calculation with a specific example.
Explanation:
Example
What is the molarity of an 87.0 % (m/m) solution of phosphoric acid that has a molality of 68.3 mol/kg and a density of 1.46 g/mL?
Solution
Step 1: Assume some convenient amount of phosphoric acid solution.
I choose to assume a mass of 1 kg of the solution. Then
Step 2: Calculate the mass of water
Step 3: Calculate the moles of
Step 4: Calculate the volume of the solution
Step 5: Calculate the molarity of the solution