Select the best answer for the question.
20. On the pH scale, which value is considered neutral?
A. 5
B. 7
C. 2
D. 11
Answer (2)
pH scale measures acidity or basicity of a solution.
A pH of 7 indicates a neutral solution.
Values below 7 are acidic, and values above 7 are basic.
Therefore, the neutral pH value is 7 .
Explanation
Understanding pH Scale The pH scale is used to specify the acidity or basicity of an aqueous solution. A pH of 7 is considered neutral, meaning it is neither acidic nor basic. Values below 7 are acidic, and values above 7 are basic (or alkaline).
Identifying Neutral pH We are given the options A. 5, B. 7, C. 2, and D. 11. We need to identify which of these values corresponds to a neutral solution.
Determining the Answer Since a neutral solution has a pH of 7, the correct answer is B. 7.
Examples
Understanding pH 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, maintaining the correct pH balance in our blood is vital for our health. Even in everyday life, the pH of our drinking water and cleaning products affects their safety and effectiveness. The concept of pH, representing acidity or alkalinity, is fundamental in chemistry and biology, influencing countless processes around us.
The pH scale measures how acidic or basic a solution is, with a neutral value of 7. Among the options given, B. 7 represents the neutral solution. Thus, the correct answer is B. 7.
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