Question

The pH of 0.1 M solution of cyanic acid (HCNO) is 2.34. Calculate the ionisation constant of the acid and its degree of ionisation in the solution.

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Solution

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therefore space space space straight K subscript straight a space equals space fraction numerator left parenthesis straight H to the power of plus right parenthesis thin space open square brackets CNO to the power of minus close square brackets over denominator open square brackets HCNO close square brackets end fraction space space space space space space space equals space fraction numerator left parenthesis 4.57 space cross times space 10 to the power of negative 3 end exponent right parenthesis thin space left parenthesis 4.57 space cross times space 10 to the power of negative 3 end exponent right parenthesis over denominator 0.1 end fraction space space space space space space space equals 2.09 space cross times space 10 to the power of negative 4 end exponent We space know comma straight alpha space equals square root of straight K subscript straight a over straight C end root space equals space square root of fraction numerator 2.09 space cross times space 10 to the power of negative 4 end exponent over denominator 0.1 end fraction end root space equals space 0.0457

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Equilibrium

The pH of 0.1 M solution of cyanic acid (HCNO) is 2.34. Calculate the ionisation constant of the acid and its degree of ionisation in the solution.

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