Concentration Calculations

Please note: Only red cells need to be completed and can be checked.
In the reaction equation stoichiometric coefficients of 1 also need to be stated explicitly.

Exercise a
Exercise b
Exercise c
Exercise d
Exercise e

Calculate what amount (mass) of AgNO₃ is required to prepare 250 mL of a AgNO₃ solution with c(AgNO₃) = 0.06 mol/L.
First balance the reaction equation for dissolving the salt AgNO₃ in water.

AgNO₃ (s) + H₂O (l) → Ag⁺ (aq) + NO₃⁻ (aq)
Molar Mass (g/mol)
Concentration (mol/L)
Volume (L)
Amount (mol)
Mass (g)

5 g of the salt ammonium sulphate (NH₄)₂SO₄ are dissolved in 250 mL of water.
• Balance the reaction equation that describes this process
• Calculate the molar concentration of ammonium ions c(NH₄⁺) in the solution.

(NH₄)₂SO₄ (s) + H₂O (l) → NH₄⁺ (aq) + SO₄²⁻ (aq)
(NH₄)₂SO₄ H₂O NH₄⁺ SO₄²⁻
Molar Mass (g/mol)
Amount of Substance (mol)
Volume (L)
Concentration (mol/L)
Mass (g)

25 g Aluminium chloride AlCl₃ is dissolved in 200 mL water. Calculate c(AlCl₃), c(Al³⁺) and c(Cl⁻)
• Balance the reaction equation for the process of dissolving the salt in water

AlCl₃(s) + H₂O (l) → Al³⁺ (aq) + Cl⁻ (aq)
AlCl₃ H₂O Al³⁺ Cl⁻
Molar Mass (g/mol)
Amount of Substance (mol)
Volume (L)
Concentration (mol/L)
Mass (g)

350 mL of a solution containing 4 g of magnesium nitrate Mg(NO₃)₂ and 200 mL of a potassium nitrate KNO₃ solution with c(KNO₃) = 0.35 mol/L are mixed. Calculate the total molar concentration c(NO₃⁻)

Mg(NO₃)₂(s) KNO₃(s) H₂O NO₃⁻(aq)
Mass (g)
Molar Mass (g/mol)
Amount of NO₃⁻ (mol)
Total Volume (L)
Concentration of NO₃⁻ (mol/L)

To a solution of 10 g lithium bromide (LiBr) in 150 mL water are added 100 mL of sodium bromide c(NaBr) = 0.05 mol/L solution. Calculate c(Br⁻) and c(Li⁺) in the resulting solution.

LiBr (s) NaBr (aq) H₂O Br⁻ (aq)
Mass (g)
Molar Mass (g/mol)
Amount of Substance (mol)
Amount of Br⁻ (mol)
Total Volume (L)
Final Concentration (mol/L)