Ion-exchange reactions
Answers are for parents and teachers.
1
Write the net ionic equation for FeCl₃ + 3NaOH.
Fe³⁺ + 3OH⁻ → Fe(OH)₃↓ (brown precipitate).
2
Write K₂CO₃ + 2HNO₃ in molecular, full ionic and net ionic form.
K₂CO₃ + 2HNO₃ → 2KNO₃ + H₂O + CO₂↑; 2K⁺ + CO₃²⁻ + 2H⁺ + 2NO₃⁻ → 2K⁺ + 2NO₃⁻ + H₂O + CO₂↑; CO₃²⁻ + 2H⁺ → H₂O + CO₂↑.
3
Which single reagent can distinguish colourless KCl and K₂SO₄ solutions?
BaCl₂ solution: K₂SO₄ gives white BaSO₄, KCl shows no change (demonstrated by the teacher).
4
How many grams of AgCl can be obtained from 34 g AgNO₃ (0.2 mol)? (M(AgCl) = 143.5 g/mol)
28.7 g
5
In which cases does the reaction go to completion: a) CaCl₂ + Na₂CO₃; b) NaNO₃ + KCl; c) H₂SO₄ + BaCl₂?
a) CaCO₃↓ forms and c) BaSO₄↓ forms; b) does not occur.