The ache, or \"burn\", you feel in your muscles during strenuous exercise is cau

Question

The ache, or "burn", you feel in your muscles during strenuous exercise is caused by the accumulation of lactic acid, which has the structure shown below. The hydrogen atom in the COOH group is acidic, and it can be removed using base to form a COO^- group. To determine the concentration of a solution of lactic acid, a chemist titrates a 21.75 mL sample of it with 0.1010 M NaOH, and finds that 13.40 mL of titrant are required to reach the equivalence point. What is the concentration of the lactic acid solution in moles per liter?

Explanation / Answer

Ans

An equimolar concentration of both acid and base are required for the complete titration reaction .
So the molarity of the acid can be determined by using the formula ,

M1 V1 = M2 V2

where M is the molarity and V is the volume .

Putting the values in the formula ,

M1 x 21.75 = 0.1010 x 13.40

M1 = 0.0622 M

So the molarity of the acid is 0.0622 M

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