Question

A 5.45 g sample of a laboratory solution contains 1.74 g of acid. What is the concentration of the solution as a mass percentage

Answer 1

30.5%

Step-by-step explanation:

A solution's percent concentration by mass,

% m/m

, tells you how many grams of solute, which in your case is an unknown acid, are present in 100 g of solution

• % m/m = grams of solute / 100 g of solution

As you know, a solution contains a solute and a solvent, which more often than not is water. This means that a solution's

% m/m

concentration tells you how many grams of solute and grams of solvent must be mixed to get

100 g

of solution.

In your case, you know that you get

1.32 g

of acid in

4.33 g

of solution. To find the solution's percent concentration by mass, use this as a conversion factor to figure out how many grams of solute you'd get in

100 g

of solution