Which pH value represents an alkaline substance?

Which pH value represents an alkaline substance?

• A. pH 5-6
• B. pH 1-2
• C. pH 7-8
• D. pH 3-4

Answer: (C)

An alkaline substance is defined by its pH value, which indicates how basic a solution is. The pH scale ranges from 0 to 14, with values below 7 considered acidic, values at 7 considered neutral, and values above 7 considered alkaline or basic. A pH value of 7 indicates pure water, which is neutral. Therefore, a pH value of 7-8 reflects a slightly basic nature, making it alkaline. In contrast, pH values that fall below 7 are indicative of acidic substances, while a neutral pH (7) does not reflect alkalinity. As a result, the range specified in the correct answer aligns with the definition of alkaline substances, confirming that this is the appropriate choice.

An alkaline substance is defined by its pH value, which indicates how basic a solution is. The pH scale ranges from 0 to 14, with values below 7 considered acidic, values at 7 considered neutral, and values above 7 considered alkaline or basic. A pH value of 7 indicates pure water, which is neutral. Therefore, a pH value of 7-8 reflects a slightly basic nature, making it alkaline.

In contrast, pH values that fall below 7 are indicative of acidic substances, while a neutral pH (7) does not reflect alkalinity. As a result, the range specified in the correct answer aligns with the definition of alkaline substances, confirming that this is the appropriate choice.