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What is the concentration of H3O+ ions in a solution with a pH of 3?

1. H3O+ concentration is 1 × 10^-3 moles per litre
2. H3O+ concentration equals 1 × 10^-3 moles per litre
3. The value of H3O+ is 1 × 10^-3 moles per litre
4. The concentration of H3O+ ions is 1 × 10^-3 moles per litre

Correct answer: H3O+ concentration is 1 × 10^-3 moles per litre

Solution

The pH of a solution is defined as -log[H3O+]. For pH = 3, [H3O+] = 10^-3 moles/litre.

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