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If we mix 50.0mL of 0.20M NaOH with 50.0mL of 0.10M citric acid, what is the...

If we mix 50.0mL of 0.20M NaOH with 50.0mL of 0.10M citric acid, what is the resulting pH? For citric acid: K1 = 7.4E-4, K2 = 1.7E-5 and K3 = 4.0E-7.

The answer is suppose to be 5.58 but I can't get it.

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