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What does the pH scale measure, and what does a value of 7 represent?

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1. What does the pH scale measure, and what does a value of 7 represent?

How acidic or basic a substance is, with 7 representing neutral

Only how basic a substance is, with no measurement of acidity

A substance’s temperature, with 7 representing boiling point

The pH scale measures density, with 7 representing water’s exact density

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