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A weak acid, HA, has a Ka of 1.00 x 10-5. If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to 

(a) 1.00% 

(b) 99.9% 

(c) 0.100% 

(d) 99.0%

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Best answer

The correct option is: (a) 1.00% 


For a weak acid, degree of dissociation,

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