Which statement about the pH scale is incorrect?

Which statement about the pH scale is incorrect?

• A. -7 indicates a neutral substance
• B. Values below 7 indicate more acidity
• C. Values below 7 indicate more alkalinity
• D. -logarithmic scale that identifies the degree of acidity or alkalinity of a substance

Answer: (C)

The pH scale is a crucial concept in both chemistry and esthetics, as it measures the acidity or alkalinity of a solution. The scale typically ranges from 0 to 14, where values below 7 signify acidity, 7 represents neutrality, and values above 7 indicate alkalinity. When a substance has a pH of 7, it is considered neutral. Therefore, stating that a pH of -7 indicates a neutral substance is incorrect because pH values cannot be negative; the scale starts from 0. Additionally, as the pH decreases below 7, the substance becomes increasingly acidic, which aligns with the statement regarding values below 7 indicating higher acidity. The pH scale is indeed a logarithmic scale, meaning that each whole number change on the scale represents a tenfold change in acidity or alkalinity. Thus, this provides a clear context for estimating how acidic or alkaline a substance is based on its pH reading. The statement asserting that values below 7 indicate more alkalinity is incorrect because it contradicts the foundational principle of the pH scale. Values less than 7 show greater acidity, not alkalinity. Therefore, identifying that statement helps clarify the proper understanding of pH levels in various

The pH scale is a crucial concept in both chemistry and esthetics, as it measures the acidity or alkalinity of a solution. The scale typically ranges from 0 to 14, where values below 7 signify acidity, 7 represents neutrality, and values above 7 indicate alkalinity.

When a substance has a pH of 7, it is considered neutral. Therefore, stating that a pH of -7 indicates a neutral substance is incorrect because pH values cannot be negative; the scale starts from 0. Additionally, as the pH decreases below 7, the substance becomes increasingly acidic, which aligns with the statement regarding values below 7 indicating higher acidity.

The pH scale is indeed a logarithmic scale, meaning that each whole number change on the scale represents a tenfold change in acidity or alkalinity. Thus, this provides a clear context for estimating how acidic or alkaline a substance is based on its pH reading.

The statement asserting that values below 7 indicate more alkalinity is incorrect because it contradicts the foundational principle of the pH scale. Values less than 7 show greater acidity, not alkalinity. Therefore, identifying that statement helps clarify the proper understanding of pH levels in various