The pH Scale (HSC SSCE Chemistry): Quizzes

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The pH Scale
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What does the term 'pH' stand for?

Hydrogen power or power of hydrogen

What is the pH value of a neutral solution at 25°C25°\text{C}?

77

An increase of 1 unit on the pH scale represents what change in [H+][\text{H}^+]?

10-fold decrease

What is the mathematical formula for calculating pH?

pH=−log⁡10[H+]\text{pH} = -\log_{10}[\text{H}^+]

If [H+]=1×10−3[\text{H}^+] = 1 \times 10^{-3} M, what is the pH?

3.03.0

Over what range does each indicator typically change colour?

About 2 pH units

What is universal indicator?

A mixture of several indicators

What is an advantage of pH meters over indicators?

Greater accuracy when properly calibrated

At any pH, adding the exponents of [H+][\text{H}^+] and [OH−][\text{OH}^-] (ignoring negatives) equals what?

1414

In a pH value, which digits are significant figures?

Only digits after the decimal point

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