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Methanol self-ionizes as CH3OH <=> CH3O- + H+. For a 0.5 M methanol solution, the equilibrium concentration of H+ is found to be 2.5 x 10⁻⁴ M. Calculate the percentage dissociation of methanol.

1. 0.025%
2. 0.05%
3. 0.5%
4. 5%

Correct answer: 0.05%

Solution

Since each ionized methanol produces one H+, the fraction dissociated is [H+]/0.5, and multiplying by 100 gives 0.05%.

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