How to calculate the absorbance at ph

Reference no: EM13288679

A solution of a weak acid, HA, is prepared by dissolving 4.8 mmol of HA in 10.0 liters of a solution.
The following values of absorbances were measured in a 1.0 cm cell in various buffers.

pH: 1.00, A=1.25
pH:2.00, A= 1.25
pH:7.38, A=0.45
pH:11.0, A= 0.29
pH:12.0, A=0.29

a) Assuming that at low pH the principle species in solution is HA and at high pH the principle species is A-, calculate the pKa of the indicator.

b) calculate the absorbance at pH 6.50.

Reference no: EM13288679

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