Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Calculations with equations involving solutions
19 practice questions
Practice questions
11–19 of 19
Question 11
3 marks · Normal
Answer and see the solution →What mass of magnesium sulfate, MgSO₄, is produced when 25 cm³ of 0.50 mol/dm³ sulfuric acid, H₂SO₄, reacts with excess magnesium oxide, MgO?
(Ar: Mg = 24, S = 32, O = 16)
Question 12
3 marks · Normal
Answer and see the solution →A student dissolves 0.015 mol of silver nitrate in 100 cm³ of water.
Explain how to work out the concentration of this solution in mol/dm³. Show your calculation.
Question 13
4 marks · Normal
Answer and see the solution →A student carries out a reaction between sodium hydroxide and hydrochloric acid:
Results table Experiment Volume of NaOH (cm³) Concentration of NaOH (mol/dm³) 1 20 0.25 2 15 0.25 3 25 0.50 (a)[2 marks]For experiment 2, calculate the number of moles of NaOH used.
(b)[2 marks]Using the equation, state the number of moles of HCl needed to react with the NaOH in experiment 2 and explain your answer.
Question 14
1 mark · Normal
Answer and check →Which of the following shows the correct mass of sodium chloride produced when 0.020 mol of hydrochloric acid, HCl, reacts with excess sodium hydroxide, NaOH? (Ar: Na = 23, Cl = 35.5)
- A.0.585 g
- B.1.17 g
- C.2.34 g
- D.0.2925 g
Question 15
2 marks · Normal
Answer and see the solution →Calculate the number of moles of copper(II) sulfate in 200 cm³ of solution with concentration 0.050 mol/dm³.
Question 16
4 marks · Normal
Answer and see the solution →Potassium permanganate reacts with iron(II) sulfate as shown:
(a)[2 marks]Calculate the number of moles of FeSO₄ in 50 cm³ of 0.20 mol/dm³ solution.
(b)[2 marks]Use the equation to find the number of moles of KMnO₄ needed to react with this amount of FeSO₄.
Question 17
2 marks · Hard
Answer and see the solution →Sodium carbonate reacts with hydrochloric acid according to the following equation:
If 0.06 mol of hydrochloric acid, HCl, are used in the reaction, calculate the number of moles of sodium carbonate, Na2CO3, that will completely react.
Question 18
5 marks · Hard
Answer and see the solution →Ethanoic acid reacts with sodium hydroxide as follows:
A student mixes 30 cm³ of 0.40 mol/dm³ ethanoic acid with excess sodium hydroxide.
(a)[2 marks]Calculate the number of moles of ethanoic acid used.
(b)[3 marks]Calculate the mass of sodium acetate (CH₃COONa) produced. (Relative formula mass: CH₃COONa = 82)
Question 19
2 marks · Hard
Answer and see the solution →Calculate the number of moles of sulfuric acid, H₂SO₄, in 75 cm³ of solution with concentration 0.20 mol/dm³.