Answer:
There is 11.40 grams of NaCl are required to prepare the solution
Explanation:
* Lets explain how to solve the problem
- We want to prepare 60 mL of 19% solution of NaCl
- The concentration of NaCl is 19%
- The volume of solution is 60 mL
- We need to find the mass of NaCl
- We must to understand the meaning of concentration %
- Concentration % means x grams of solute in 100 mL of solution
- So, 19% of NaCl means 19 grams of NaCl in 100 mL of solution.
∵ In 100 mL of solution, we need 19 grams of NaCl
∴ Find how many gram in 60 mL by using cross multiplication
∵ 19 grams ⇒ 100 mL
x grams ⇒ 60 mL
- By using cross multiplication
∴ x × 100 = 19 × 60
∴ 100 x = 1140
- Divide both sides by 100
∴ x = 11.40
∵ x represents the NaCl grams in the solution
∴ There is 11.40 grams of NaCl are required to prepare the solution