pH

Question

pH

BlackTom AI · Accepted Answer

Question restatement: The prompt asks about pH and provides several statements to judge their truthfulness.

Option 1: 'increases with acidity.' This is misleading. In fact, pH decreases as acidity increases; higher acidity means more H+ and lower pH, so this statement is false.

Option 2: 'is measured on a scale of 0 to 10.' The standard pH scale ranges from 0 to about 14 in aqueous solutions, not limited to 0–10, so this claim is incorrect.

Option 3: 'is a measure of the hydrogen ion concentration.' This is correct. pH is defined as the negative logarithm of the hydrogen ion activity/concentration in a solution, so it directly reflects H+ levels.

Option 4: 'reflects sodium content of body fluids.' Sodium content is not what pH measures; pH relates to hydrogen ion concentration, not electrolyte quantity like sodium, so this is false.

Option 5: 'is not related to amounts of carbon dioxide in the body.' This is inaccurate. In biological systems, CO2 forms carbonic acid in solution and influences hydrogen ion concentration, thereby affecting pH; thus pH is related to CO2 levels, so this statement is false.

Summary of reasoning: Each option is evaluated against the fundamental definition of pH as a log-scale measure of hydrogen ion concentration, and its dependence on factors like acidity and carbon dioxide. The correct understanding is that pH indicates H+ concentration, not a simple 0–10 scale, not sodium content, and it is indeed related to CO2 through carbonic acid dynamics.

pH单项选择题

类似问题

The scale that is used to represent hydrogen ion concentrations in water, and differentiates acids and bases, is the scale.

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A solution with a pH of 3 is:

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