Diluting Solutions

Question 1 of 1

Question 1-530ml

4 points

You have 353 mL of a 1.25 M potassium chloride solution, but you need to make a 0.50 M potassium chloride solution. How many milliliters of water must you add to the original 1.25 M solution to make the 0.50 M potassium chloride solution?
(Where appropriate, enter your answer using the format 8.050e-3 for 8.050 × 10^-3.)

mL of water need to be added

Your answer is incorrect. Please try again or try a hint.

Hint 1

Remember that only water is added in a dilution. The amount of solute in the final (more dilute) solution is the same as the amount of solute in the original concentrated solution. Top of page

Hint 2

moles1 (before dilution) = moles2 (after dilution) To find moles1 --Select--multiplydivide the original volume by the original --Select--molesmolar massmassmolarity. Your extra effort will pay off! Top of page

Hint 3

Be sure that your units agree for moles1 and moles2. Pay particular attention to the volume units. Top of page

Hint 4

Top of page

Question 1 of 1