Question

How many milliliters of a​ 1:50 sodium chloride solution contain 300 milligrams of sodium​ chloride?

A.

37.5 mL

B.

375 mL

C.

15 mL

D.

24 mL

Answer 1

1:50 means 1 g of sodium chloride in 50 ml of solution

1 g = 1000 milligram

Therefore, 1000 milligrams of sodium chloride are found in 50 ml of solution.

1 milligram is found in 50/1000 ml of solution

Hence, 300 milligrams are found in 50/1000 X 300 = 0.05 X 300 = 15 ml of solution

So, the correct answer is option C- 15 ml.