Question

Concentrated nitric acid is labelled as 75% by mass. The volume in mL of the solution which contains 30 g of nitric acid is: 
Given: Density of nitric acid solution is 1.25 g/mL.

• A. 55
• B. 45
• C. 40
• D. 32

Hint:

When solving mass and volume problems, use the relationship \( {Density} = \frac{{Mass}}{{Volume}} \) to find the missing values.

Answer 1

The Correct Option is C

The nitric acid solution has a mass concentration of 75%. This indicates that 100 g of solution contains 75 g of nitric acid. The objective is to determine the volume of solution containing 30 g of nitric acid. Initially, compute the total mass of solution necessary for 30 g of nitric acid: \[ {Mass of solution} = \frac{30 \, {g}}{0.75} = 40 \, {g} \] Subsequently, using the solution's density of 1.25 g/mL, calculate the solution's volume: \[ {Volume} = \frac{40 \, {g}}{1.25 \, {g/mL}} = 32 \, {mL} \] Therefore, the required volume is 32 mL.