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In the titration of 0.04 M weak base B of 50mL with 0.100 M HCl, what...

In the titration of 0.04 M weak base B of 50mL with 0.100 M HCl, what is the solution pH after 3 mL HCl is added? pka of the conjugate acid of base (B) is 7.9

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