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Acids and bases (A-level only)

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Question 17

Values of the ionic product of water (KwK_wKw​) at different temperatures are given:

  • Kw=3.60×10−15 mol2 dm−6K_w = 3.60 \times 10^{-15} \text{ mol}^2 \text{ dm}^{-6}Kw​=3.60×10−15 mol2 dm−6 at 10 ∘C10\ ^\circ\text{C}10 ∘C
  • Kw=1.00×10−14 mol2 dm−6K_w = 1.00 \times 10^{-14} \text{ mol}^2 \text{ dm}^{-6}Kw​=1.00×10−14 mol2 dm−6 at 25 ∘C25\ ^\circ\text{C}25 ∘C

Which statement is correct?

The concentration of hydrogen ions in pure water at 10 ∘C10\ ^\circ\text{C}10 ∘C is 6.00×10−8 mol dm−36.00 \times 10^{-8} \text{ mol dm}^{-3}6.00×10−8 mol dm−3

The dissociation of water into ions is an exothermic process.

The pH of pure water is the same at 25 ∘C25\ ^\circ\text{C}25 ∘C and at 10 ∘C10\ ^\circ\text{C}10 ∘C

Water becomes less acidic as the temperature is raised.

Acids and bases (A-level only) Questions

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