Question

A student dilutes 50.0 mL of a 0.10 mol/L solution of HCl to 0.010 mol/L by adding water. Which statement is true?

Select one:

a.
The total amount of solute remain the same.


b.
The volume of the solution remains the same.


c.
The volume of the solvent remain the same.

d is wrong.

Answer 1

Here’s the step-by-step:

1. Originally we have 50.0 mL of a 0.10 mol/L HCl solution.

2. This means we originally have 0.10 mol/L * 0.0500 L = 0.0050 moles of HCl.

3. The question states we dilute this to 0.010 mol/L.

4. Dilution means we are adding more solvent (water) but not adding any more solute (HCl).

5. Therefore, the amount of HCl (0.0050 moles) remains the same.

6. The volume, however, increases as we add more water

7. So the correct answer is that the total amount of solute (HCl) remains the same after dilution.

8. So the correct answer is a.