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Physical Chemistry (PI5.2 Acid-base equilibria)

Quick questions on Acid-Base Equilibria (PI5.2) - Eduqas A-Level Chemistry

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is indicator choice?
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Match the indicator's range to the vertical part of the curve; phenolphthalein is wrong for a strong-acid/weak-base titration.
What is KwK_w temperature dependence?
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Kw=1.0×10−14K_w = 1.0 \times 10^{-14} only at 298 K298\ \text{K}; because the ionisation of water is endothermic, KwK_w rises with temperature, so neutral pH is below 7 at higher temperatures.
What is q1?
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Calculate the pH of 0.0500 mol dm−30.0500\ \text{mol dm}^{-3} hydrochloric acid. [1 mark]
What is q2?
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Calculate the pH of 0.100 mol dm−30.100\ \text{mol dm}^{-3} sodium hydroxide (Kw=1.0×10−14K_w = 1.0 \times 10^{-14}). [2 marks]

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