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What is the pH of a solution prepared by mixing 50.00 mL of 0.10 M NH3...

What is the pH of a solution prepared by mixing 50.00 mL of 0.10 M NH3 with 25 mL of 0.10 M NH4+? Assume that the volumes of the solutions are additive and that the Ka NH4+ = 5.6 x 10-10. Please help thank you

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