Question

If 200 mL of water is evaporated from 400 mL of 0.5 M aqueous salt solution, what is the resulting concentration? 1. 2.5 × 10−1 M 2. 2.5 × 101 M 3. 2.5 × 100 M 4. 2.5 × 10−2 M 5. None of these

Answer 1

Answer:

None of these

Explanation:

Using the dilution formula;

M1V1 = M2V2

where M1 is the initial concentration, V1 is the initial volume, M2 is the concentration attained while V2 is the new volume.

Therefore;

M2 = M1V1/V2

     = (400 mL × 0.5) / 200 mL

     = 1 M

Therefore, the resulting concentration is 1M

Thus, the correct answer is "none of these"

Answer 2

If 200 mL of water is evaporated from 400 mL of 0.5 M aqueous salt solution, the resulting concentration is 1.0 M.

What is evaporation?

Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase.

A 400 mL solution has a concentration of 0.5 M. After 200 mL of water evaporate, 200 mL of solution remain. We can calculate the final concentration using the following expression.

C1 . V1 = C2 . V2

C2 = C1 . V1 / V2

C2 = 0.5 M . 400 mL / 200 mL = 1.0 M

where,

• C1 and V1 are the initial concentration and volume.
• C2 and V2 are the final concentration and volume.

If 200 mL of water is evaporated from 400 mL of 0.5 M aqueous salt solution, the resulting concentration is 1.0 M.

Learn more about evaporation here: https://brainly.com/question/25310095