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## Homework Statement

Calculate the end point pH when 50 mL 0.2 mol/L HCl solution reacts exactly with 50 mL 0.2 mol/L NH3 (equivalent to NH4OH) solution.

NH3 Kb=1.8x10^-5

## The Attempt at a Solution

I have no idea how to even attempt this question. Can someone please help me? Thanks.