1) Calculate the pH of a solution formed by mixing 65 mL of a solution that...

Question

Question

1) Calculate the pH of a solution formed by mixing 65 mL of a solution that is 0.15 M in NaHCO3 with 75 mL of a solution that is 0.10 M in Na2CO3.

Express your answer to two decimal places.

Answer 1

Answer #1

The number of millimoles of NaHCO3 = molarity* volume in mL = 0.15*65 = 9.75 mmoles

The number of millimoles Na2CO3 = 0.1*75 = 7.5 mmoles

pH of acidic buffer = pKa + log(Na2CO3/ NaHCO3)

= 10.3 + log(7.5/9.75) = 10.19

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Answer 2

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