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Part E A diprotic acid has a pKa1 -2.80 and pka2 6.50. What is the pH of a 0.10 M solution of thi...

Question

Part E A diprotic acid has a pKa1 -2.80 and pka2 6.50. What is the pH of a 0.10 M solution of thi...

Part E A diprotic acid has a pKa1 -2.80 and pka2 6.50. What is the pH of a 0.10 M solution of this acid that has been one qua

Part E A diprotic acid has a pKa1 -2.80 and pka2 6.50. What is the pH of a 0.10 M solution of this acid that has been one quarter neutralized? 97 ΑΣΦ Submit Request Answer

Answers

Answer

pH = 2.80

Explanation

Dissociation of diprotic acid is as follows

H2A <------> HA- + H+ pKa1 = 2.80

HA- <-------> A2- + H+ pKa2 = 6.50

at half neutralization

H2A = HA-

Henderson - Hasselbalch equation is

pH = pKa + log([HA-]/[H2A])

pH = 2.80 + log1

pH = 2.80

Therefore

at quarter neutralization point , pH = 2.80


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