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10.5 mL of an unknown solution are diluted to 80.0 mL. The concentration of the
new solution was determined to be 0.172 M. What was the molarity of the
unknown solution? (Report your answer to two places past the decimal point.
Moodle is looking for a number only, no units.)


Sagot :

The molarity of the unknown solution prior to dilution is calculated to be 1.31M.

How to calculate molarity?

The molarity of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

  • C1 = initial molarity
  • C2 = final molarity
  • V1 = initial volume
  • V2 = final volume

10.5 × C1 = 80 × 0.172

10.5C1 = 13.76

C1 = 13.76/10.5

C1 = 1.31M

Therefore, the molarity of the unknown solution prior to dilution is calculated to be 1.31M.

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