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Consider the titration: .30 M HCl versus .30 M methlamine (CH3NH2). What is the concentration of CH3NH3+ at the equivalence point?
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Since you are titrating 0.3 M with 0.3 M, the concn of the salt will be 0.3/2 = 0.15M (it will be diluted because you have added an equal volume of acid to base.)
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