The ache , or burn , you feel in your muscles during strenuoius exercise is caus

Question

The ache , or burn , you feel in your muscles during strenuoius exercise is caused by the accumilation of factic 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 0.1010M NaOH,and feinds that 15.60mL of titrant are required yto reach the equivalence point . What is the concentration of the lacticv acid solution in moles per liter?

Explanation / Answer

lactic acid is only one acidic proton.

so both lactic acid and NaOH reacts in 1: 1 milli mole ratio

milli moles = Volume x Concentration in Molarity

milli moles of NaOH = 15.60 x 0.1010 = 1.5756 .

so 1.5756 milli moles lactic acid reacts with NaOH

1.5756 = 21.75 x M

M = 1.5756 / 21.75 = 0.07M

concentration of lactic acid = 0.07 M

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