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6.2 Quantitative analysis

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Question 46

Sodium sulfate is manufactured using the reaction

H2SO4+2NaOH→Na2SO4+2H2O\mathrm{H_2SO_4 + 2NaOH \rightarrow Na_2SO_4 + 2H_2O}H2​SO4​+2NaOH→Na2​SO4​+2H2​O

The atom economy for sodium sulfate is 80%. One batch has a percentage yield of 76%.

Which statement is consistent with both percentages?

[1]
A

Water formed lowers the percentage yield, and sodium sulfate lost during transfer lowers the atom economy.

B

Water formed lowers both the atom economy and the percentage yield of sodium sulfate.

C

Unreacted sodium hydroxide lowers the atom economy, and sodium sulfate lost during transfer lowers the percentage yield.

D

Water formed lowers the atom economy, and some sodium sulfate left in the apparatus lowers the percentage yield.

Markscheme

6.2 Quantitative analysis Questions

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

151 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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