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how would you calculate the pH when a 5 mL solution of 15 mLHC2H3O2 + 15...

how would you calculate the pH when a 5 mL solution of 15 mLHC2H3O2 + 15 mL NaC2H3O2 is diluted with 25 mL of H2O? The pH of 15 mL HC2H3O2 + 15 mL NaC2H3O2 solution is 4.74 & pKa= 4.74

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