DISSOCIATION OF THE CARBOXYL GROUP (pKa) R C COO￾NH3 + H H NH3 + R C COOH + H+ H + K1 = H NH3 + R C COO￾R C COOH NH3 + H H + = K1 H NH3 + R C COOH R C COO￾NH3 + H pH = pK1 Log H NH3 + R C COO￾R C COOH NH3 + H [ ] +DISSOCIATION OF THE CARBOXYL GROUP (pKa) R C COO￾NH3 + H H NH3 + R C COOH + H+ H + K1 = H NH3 + R C COO￾R C COOH NH3 + H H + = K1 H NH3 + R C COOH R C COO￾NH3 + H pH = pK1 Log H NH3 + R C COO￾R C COOH NH3 + H [ ] +