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QLDChemistryQuick questions

Unit 2: Molecular interactions and reactions

Quick questions on The pH scale and introduction to acid-base chemistry (QCE Chemistry Unit 2)

7short 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 calculating pH of a strong acid solution?
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Strong acid fully ionises, so [H_3O+] equals the formal acid concentration.
What is calculating pH of a strong base solution?
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Strong base fully ionises, so [OH-] equals the formal base concentration. Then either:
What are reactions of acids?
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Three reaction types are required at QCE Unit 2 level. All produce a salt; two also produce a gas; one also produces only water (neutralisation).
What are indicators?
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pH indicators are weak acids or bases whose protonated and deprotonated forms have different colours. Common ones for QCE level:
What is q1?
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Calculate the pH of a 5.0×10−3 mol L−15.0 \times 10^{-3} \, \text{mol L}^{-1} HCl solution. [2 marks]
What is q2?
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A sample of rainwater at Cairns has pH=4.40\text{pH} = 4.40. Calculate [H+][\text{H}^+] and identify the likely acidic species. [3 marks]
What is q3?
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Compare HCl and acetic acid solutions both at 0.10 mol L−10.10 \, \text{mol L}^{-1}. (a) Predict pH of each. (b) Justify the difference.

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