A recycling plant recovers an iron nitrate, salt P. A sample of salt P contains 2.79 g of iron ions and 9.30 g of nitrate ions.
Relative atomic masses: Fe = 55.8, N = 14.0, O = 16.0
| Ion | Formula and charge |
|---|---|
| nitrate | NO3−\mathrm{NO_{3}^{-}}NO3− |
| sulfate | SO42−\mathrm{SO_{4}^{2-}}SO42− |
| hydroxide | OH−\mathrm{OH^{-}}OH− |
Deduce the charge on the iron ions in salt P. Show your working.
The same iron ions also form a sulfate and a hydroxide.
Write the formula of each of these compounds.
134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.