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6.2 Quantitative analysis

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Question 9

A student prepares lead iodide by mixing solutions of lead nitrate and potassium iodide.

Pb(NO3)2(aq)+2KI(aq)→PbI2(s)+2KNO3(aq)\mathrm{Pb(NO_3)_2(aq) + 2KI(aq) \rightarrow PbI_2(s) + 2KNO_3(aq)}Pb(NO3​)2​(aq)+2KI(aq)→PbI2​(s)+2KNO3​(aq)

The student uses 0.0400 mol of potassium iodide and excess lead nitrate. The percentage yield of pure, dry lead iodide is 80.0%.

What is the mass of lead iodide collected?

(Relative atomic masses: I = 127, Pb = 207)

[1]
A

1.84 g1.84\,\mathrm{g}1.84g

B

7.38 g7.38\,\mathrm{g}7.38g

C

9.22 g9.22\,\mathrm{g}9.22g

D

14.8 g14.8\,\mathrm{g}14.8g

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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