Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.One solution turns blue. A possible hydrogen ion concentration for this solution is:1 × 10-2 M5 × 10-2 M5 × 10-4 M1 × 10-8 M

Blue cabbage indicator suggests the solution is basic. A basic solution has a hydrogen ion concentration below 1 × 10⁻⁷ M. Of the choices, 1 × 10⁻⁸ M is below that value, so it is a possible concentration.

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