4. Phenylacetic acid, C7H7COOH, builds up in the blood of people with phenylketonuria. The pKa of...

Question

Question

4. Phenylacetic acid, C7H7COOH, builds up in the blood of people with phenylketonuria. The pKa of phenylacetic acid is 4.32 a

science chemistry

Answer 1

Answer #1

pH of salt of weak acid and strong base is

pH = 7 + $\frac{1}{2}$ ( pKa + log Csalt)

given , Csalt = 0.15 M

pKa = 4.32

therefore,

pH = 7 + $\frac{1}{2}$ (4.32 + log 0.15)

or, pH = 7 +1.75

or, pH = 8.75

Hence pH of the solution is 8.75

Ca(C7H7COO)2 is a salt of strong base Ca(OH)2 and weak base C7H7COOH

pH = 7 + $\frac{1}{2}$ ( pKa + log Csalt)

pH = 7 + $\frac{1}{2}$ (pKa + log 0.15)

pH = 7 + $\frac{1}{2}$ (4.32 - 0.824)

pH = 8.75

Answer 2

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