Two clear solutions are mixed in a stoppered flask. A yellow solid forms and the mixture becomes cloudy.
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)| Measurement | Mass / g |
|---|---|
| stoppered flask | 82.4 |
| lead nitrate solution | 36.2 |
| potassium iodide solution | 28.7 |
Calculate the total mass of the flask and solutions before they are mixed.
Give the total mass of the stoppered flask and its contents after the reaction.
Explain your answer to (b).
142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.