Question

question 24 (1 point)
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which of the following must be true if a solution is to be considered acidic?

1. $\ce{h+}$ is greater than $\ce{oh-}$
2. $\ce{h+}$ is less than $\ce{oh-}$
3. ph should be less than 7.0
4. both a and c are correct
5. both b and c are correct

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: In an acidic solution, the concentration of hydrogen ions ($\ce{[H+]}$) is greater than the concentration of hydroxide ions ($\ce{[OH-]}$). This is a fundamental definition of an acidic solution.
• Option 2: If $\ce{[H+]}$ is less than $\ce{[OH-]}$, the solution is basic, not acidic. So this is incorrect.
• Option 3: The pH scale is a measure of acidity. A pH less than 7.0 indicates an acidic solution (at 25°C, the standard temperature for this scale).
• Option 4: Since both Option 1 (correct definition of acidity in terms of ion concentrations) and Option 3 (correct definition in terms of pH) are correct, this option is valid.
• Option 5: Option 2 is incorrect, so this combination is wrong.

Answer:

1. Both a and c are correct