Which of the following does not describe an acidic solution?
The $[OH^{-}]$ is greater than $1.0 \times 10^{-7}$
The pH is less than 7.0
The $[OH^{-}]$ is $6.0 \times 10^{-10}$
The $[H_3 O^{-}]$ is greater than the $[OH^{-}]$
Answer (2)
The statement that does not describe an acidic solution is that the [ O H − ] is greater than 1.0 × 1 0 − 7 . An acidic solution has a pH less than 7 and a higher concentration of hydronium ions than hydroxide ions. Thus, it contradicts the criteria for acidity.
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An acidic solution has a pH less than 7 and a higher concentration of hydronium ions ( [ H 3 O + ] ) than hydroxide ions ( [ O H − ] ).
The concentration of hydroxide ions in an acidic solution is less than 1.0 × 1 0 − 7 .
The statement 'The [ O H − ] is greater than 1.0 × 1 0 − 7 ' does not describe an acidic solution.
Therefore, the answer is: The [ O H − ] is greater than 1.0 × 1 0 − 7
Explanation
Analyzing the Statements We need to identify which statement does NOT describe an acidic solution. Let's analyze each option:
The [ O H − ] is greater than 1.0 × 1 0 − 7 : In an acidic solution, the concentration of hydroxide ions [ O H − ] is less than 1.0 × 1 0 − 7 . Therefore, this statement does not describe an acidic solution.
The pH is less than 7.0: Acidic solutions have a pH less than 7.0. This statement describes an acidic solution.
The [ O H − ] is 6.0 × 1 0 − 10 : Since 6.0 × 1 0 − 10 is less than 1.0 × 1 0 − 7 , this statement describes an acidic solution.
The [ H 3 O − ] is greater than the [ O H − ] : In an acidic solution, the concentration of hydronium ions [ H 3 O − ] is greater than the concentration of hydroxide ions [ O H − ] . This statement describes an acidic solution.
Examples
Understanding acidity is crucial in many real-world applications. For example, in agriculture, knowing the pH of the soil helps farmers choose the right crops and fertilizers. In medicine, the pH of bodily fluids like blood is carefully monitored to ensure proper bodily functions. Even in cooking, the acidity of ingredients like lemon juice or vinegar affects the taste and texture of dishes. By understanding the properties of acidic solutions, we can better understand and control these processes.
