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PH at eqivilance point

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Calculate the pH at the equivalence point in the titration of 66 mL of 0.10 M methylamine with a 0.20 M HCl solution.

i found the kb of Methylamine to be 4.4 X 10^-4. but you use the ka of CH3NH3+ which is 2.3 X 10^-11. I thought it should be 10.94 but its incorrect.

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The pH of an equivalence point are determined.

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pH at eqivilance point
Calculate the pH at the equivalence point in the titration of 66 mL of 0.10 M methylamine with a 0.20 M HCl solution. I found the kb of Methylamine to be 4.4 X 10^-4. but you use the ka of CH3NH3+ which is 2.3 X 10^-11

CH3NH2 + H+ ↔ CH3NH3+
Initial ...

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