The Ionic Product of Water (AQA A-Level Chemistry): Flashcards

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The Ionic Product of Water
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Formula for KwK_w

Kw=[extH+][extOH]K_w = [ ext{H}^+][ ext{OH}^-]

Value of KwK_w at 25°C

1.00imes10141.00 imes 10^{-14} mol² dm⁻⁶

Units of KwK_w

mol² dm⁻⁶

Why KwK_w increases with temperature

Water dissociation is endothermic

Equilibrium position in water dissociation

Far to the left

[extH+][ ext{H}^+] vs [extOH][ ext{OH}^-] in pure water

Equal concentrations

[extH+][ ext{H}^+] in pure water (using KwK_w)

[extH+]=sqrtKw[ ext{H}^+] = sqrt{K_w}

Effect of temp. increase on pH of pure water

pH decreases slightly

[extH+][ ext{H}^+] from [extOH][ ext{OH}^-] using KwK_w

[ ext{H}^+] = rac{K_w}{[ ext{OH}^-]}

Dissociation of strong bases like NaOH

Fully dissociates

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