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What is the pH of a solution if 10.78mL of 0.10MHCl is added to the buffer obtained by mixing 133.40mL of 0.50MCH3NH2 and 222.32mL of

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What is the pH of a solution if 10.78mL of 0.10MHCl is added to the buffer obtained by mixing 133.40mL of 0.50MCH3NH2 and 222.32mL of 1.0MCH3NH3+Cl? (Kb(CH3NH2)=5.2104) Input your answer to 2 decimal places. For example, if your answer is pH=12, enter 12.00

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