The molarity of the unknown solution prior to dilution is calculated to be 1.31M.
The molarity of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
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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