1.

Calculate the pKa of lactic acid, given that when the concentration of lactic acid is 0.010M and the concentration of lactate is 0.087M, the pH is 4.80.

Answer»

pH = pKa + log [lactate]/[lactic acid] 

pKa = pH – log [lactate]/[lactic acid] 

= 4.80 – log (0.087/0.010) 

= 4.80 – log 8.7

= 3.9.



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