Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.The second solution turns purple. A possible hydrogen ion concentration for this solution is: 1 × 10-2 M7× 10-3 M1 × 10-7 M7 × 10-4 M

Purple cabbage indicator suggests the solution is approximately neutral, with a pH near 7. Since pH = −log₁₀[H⁺], a pH of 7 corresponds to a hydrogen ion concentration of 1 × 10⁻⁷ M. So the possible concentration is 1 × 10⁻⁷ M.

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