Problem: HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.00 L solution. The pH of the solution was 4.93 at 25°C. The Ka of HZ is___a) 6.9x10-9b) 1.4x10-10c) 1.2x10-5d) 2.8x10-12e) 9.9x10-2

FREE Expert Solution

Remember that weak acids partially dissociate in water and that acids donate H+ to the base (water in this case). 


The dissociation of HA is as follows:

HA(aq) + H2O(l) ⇌ H3O+(aq) + A–(aq)


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Problem Details

HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.00 L solution. The pH of the solution was 4.93 at 25°C. The Ka of HZ is___

a) 6.9x10-9

b) 1.4x10-10

c) 1.2x10-5

d) 2.8x10-12

e) 9.9x10-2

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