Multiple Choice
Ammonium thioglycolate (often used in hair relaxers) is basic. Which pH range best matches ammonium thioglycolate relaxers?
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17. Acid and Base Equilibrium
The pH Scale
Multiple Choice
Distilled water at (at ) is considered which of the following?
A
Strongly acidic
B
Basic
C
Acidic
D
Neutral
Verified step by step guidance1
Understand that pH is a measure of the hydrogen ion concentration in a solution, defined as \(\mathrm{pH} = -\log[\mathrm{H}^+]\).
Recognize that distilled water at 25\(\degree\) C has a pH of 7, which means the concentration of hydrogen ions \([\mathrm{H}^+]\) is \(1 \times 10^{-7}\) M.
Recall that a pH of 7 is considered neutral because the concentrations of hydrogen ions \([\mathrm{H}^+]\) and hydroxide ions \([\mathrm{OH}^-]\) are equal in pure water.
Note that solutions with pH less than 7 are acidic (higher \([\mathrm{H}^+]\)), and those with pH greater than 7 are basic (lower \([\mathrm{H}^+]\)).
Therefore, distilled water at pH 7 is classified as neutral, neither acidic nor basic.
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