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What would be the pH values when (a) 0.0090molHCl and (b) 0.0090molNaOH, added to 0.300L of a buffer solution that is 0.250MHC2H3O2 and 0.560MNaC2H3O2 ?

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What would be the pH values when (a) 0.0090molHCl and (b) 0.0090molNaOH, added to 0.300L of a buffer solution that is 0.250MHC2H3O2 and 0.560MNaC2H3O2 ? If . pKa(HC2H3O2) is 4.74 3.14,3.04 5.17,5.02 2.14,2.04 4.14,4.04

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