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Question

A 0.03M solution of pyridinium hydrochloride has a pH of 3.50. Calculate the ionization constant of this substance.

Expert Answer

It is required to calculate the ionization constant of the pyridinium hydrochloride. Since, pyridinium hydrochloride is a salt of strong acid and weak base, it can be calculated by the following equation,

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MathML (base64):PG1hdGggbWF0aHNpemU9IjE2Ij4KICAgIDxtc3ViPgogICAgICAgIDxtaT5wSzwvbWk+CiAgICAgICAgPG1yb3c+CiAgICAgICAgICAgIDxtdGV4dD53PC9tdGV4dD4KICAgICAgICA8L21yb3c+CiAgICA8L21zdWI+CiAgICA8bW8+PTwvbW8+CiAgICA8bW4+MTwvbW4+CiAgICA8bW4+NDwvbW4+CjwvbWF0aD4=

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MathML (base64):PG1hdGg+CiAgICA8bXJvdz4KICAgICAgICA8bXRleHQgbWF0aHNpemU9IjE2Ij5TdWJzdGl0dXRpbmcgYWxsIHRoZSB2YWx1ZXMgaW4gdGhlIGVxdWF0aW9uPC9tdGV4dD4KICAgIDwvbXJvdz4KPC9tYXRoPg==

MathML (base64):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

The ionization constant for pyridinium hydrochloride was found to be 3 x 10^-9