Question
12.5 g NaCl is dissolved in water and the volume is made exactly 250 cc. What is the weight percentage of the solution? [Ans. 5%]
Answer
Mass of solute = 12.5 g
Volume of solution = 250 cc
Step 1 : Calculation of mass of solution
mass of solution = 250 cc × 1 g/cc = 250 g
Step 2 : Calculation of weight percentage
Weight percentage = mass\ of\ solute\over mass\ of\ solution × 100%
= 12.5\over 250 × 100% = 5%
Therefore, the weight percentage of the solution is 5%.
