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6.2 Quantitative analysis

6.2 Quantitative analysis

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Question 45

Ammonium sulfate, (NH4)2SO4(\text{NH}_4)_2\text{SO}_4(NH4​)2​SO4​, is a widely used industrial fertilizer. It can be manufactured by two different methods:

  • Method 1: Direct neutralization of ammonia with sulfuric acid

    2NH3+H2SO4→(NH4)2SO4 2\text{NH}_3 + \text{H}_2\text{SO}_4 \rightarrow (\text{NH}_4)_2\text{SO}_4 2NH3​+H2​SO4​→(NH4​)2​SO4​

    atom economy = 100%

  • Method 2: Reaction between ammonium carbonate and gypsum (calcium sulfate)

    (NH4)2CO3+CaSO4→(NH4)2SO4+CaCO3 (\text{NH}_4)_2\text{CO}_3 + \text{CaSO}_4 \rightarrow (\text{NH}_4)_2\text{SO}_4 + \text{CaCO}_3 (NH4​)2​CO3​+CaSO4​→(NH4​)2​SO4​+CaCO3​

    atom economy = 56.9%

State why Method 1 has an atom economy of 100% [1].

[1]
Markscheme

6.2 Quantitative analysis Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Quantitative analysis

157 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.

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