Part a a solution is made by mixing 9.00 mmol (millimoles) of ha and 3.00 mmol of the strong base. what is the resulting ph? express the ph numerically to two decimal places.

Question

Diana Rivers

Chemistry

30 September, 08:27

Part a a solution is made by mixing 9.00 mmol (millimoles) of ha and 3.00 mmol of the strong base. what is the resulting ph? express the ph numerically to two decimal places.

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Answers (1)

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Kylie Nash · Answer 1

Assuming that the reaction is unimolecular on both reactant and product sides such that:

HA + OH - - - > A - + H2O

Therefore the amount of A - left is:

mmol HA = 9.00 - 3.00 = 6.00

mmol A - = 3.00

pKa = - log Ka = 5.25

Calculating for pH:

pH = 5.25 + log 3.00/6.00

pH = 4.95