Question

What is the amount of water need to make a 5.0% w/v NaCl solution if 10 g of NaCl are dissolved?

A. 20 mL
B. 500 mL
C. 50 mL
D. 200 mL

Answer 1

To make a 5.0% w/v NaCl solution with 10 g of NaCl, you would need 200 mL of water.

Step-by-step explanation:

To calculate the amount of water needed to make a 5.0% w/v NaCl solution, we can use the formula:

Mass of solute (NaCl) = volume of solution (water) × mass/volume percentage

Given that 10 g of NaCl are dissolved, we need to find the volume of water needed. Rearranging the formula:

Volume of solution (water) = Mass of solute (NaCl) / mass/volume percentage

Plugging the values into the formula:

Volume of solution (water) = 10 g / 5.0% = 200 mL

Therefore, 200 mL of water is needed to make a 5.0% w/v NaCl solution.