Dr. Sweeney is a research chemistry who recently discovered an old bottle labele

Question

Dr. Sweeney is a research chemistry who recently discovered an old bottle labeled perchloric acid (HCIO4) in the back of his research laboratory. After verifying that the contents of the bottle were indeed HCIO4 Dr Sweeney was interested in determining the concentration of HCIO4 in the bottle. To determine the concentration of HCIO4 Dr Sweeney performed a titration using 20 ml of HCIO4 and phenolphthalein. Dr Sweeney determined that it took 24 ml of 0.040 M NaOH to reach the endpoint of the titration. What is the concentration of HCIO4 in the bottle that Dr. Sweeney found?

Explanation / Answer

Given that 20 ml of HCIO4 requires 24 ml of 0.040 M NaOH

The equation for the reaction is

HClO4 + NaOHNaClO4 + H2O

From the equation it is evident that 1 equiv. of NaOH is required to neutralize 1 equiv. of HClO4

Concentration of HCIO4 in the bottle can be

Therefore using the formula

M1V1 = M2V2

0.040 M X 24 mL = M2 X 20 mL

M2 = 0.040 M X 24 mL/ 20 mL = 0.048 M

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