The pH Scale (Leaving Cert Chemistry): Flashcards

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The pH Scale
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pH scale range

0 to 14

pH below 7 indicates

Acidic solutions

pH above 7 indicates

Basic (alkaline) solutions

Nature of pH scale

Logarithmic

Change in acidity per pH unit

Ten-fold change

Year pH scale developed

1909

pH scale developer

Søren Sørensen

Formula for pH

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

What 'p' in pH stands for

Power (of 10)

Effect of higher [H+][\text{H}^+] on pH

Lower pH (more acidic)

pH of pure water at 25°C

7

pH of pure water at 0°C

7.47

Neutrality means

[H+]=[OH−][\text{H}^+] = [\text{OH}^-]

Methods to measure pH

Digital meters and universal indicators

Convert pH to [H+][\text{H}^+]

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

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