Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Other alkaline solutions
18 practice questions
Practice questions
11–18 of 18
Question 11
4 marks · Normal
Answer and see the solution →The following table shows the concentration of hydrogen ions in different solutions.
Solution [H^+] (mol/dm³) A 1.0 × 10^{-2} B 1.0 × 10^{-6} C 1.0 × 10^{-4} D 1.0 × 10^{-8} (a)[2 marks]Which solution is the most acidic? Explain your answer.
(b)[1 mark]Which solution is likely to have a pH above 7? Give the letter.
(c)[1 mark]State the relationship between hydrogen ion concentration and acidity.
Question 12
1 mark · Normal
Answer and check →Which of the following substances forms an alkaline solution by reacting with water to produce hydroxide ions?
- A.Sodium chloride
- B.Potassium carbonate
- C.Calcium sulfate
- D.Ethanoic acid
Question 13
2 marks · Normal
Answer and see the solution →State the formula of the ion present in all alkaline solutions and give its charge.
Question 14
4 marks · Normal
Answer and see the solution →Some cleaning products are described as 'alkaline'.
(a)[2 marks]Ammonia is commonly found in cleaning products. State the ions that are produced when ammonia reacts with water.
(b)[2 marks]Explain why solutions of ammonia are described as alkaline.
Question 15
3 marks · Normal
Answer and see the solution →A student adds hydrochloric acid (HCl), at a concentration of 0.020 mol/dm³, to water. Hydrochloric acid completely dissociates into ions:
Calculate the concentration of hydrogen ions (H⁺) in the solution after the HCl fully dissociates. Explain your reasoning.
Question 16
2 marks · Hard
Answer and see the solution →State the name and the full chemical formula of the ion that is present in all acidic solutions and causes acidity.
Question 17
5 marks · Hard
Answer and see the solution →The following table shows two acids and their reactions in water.
Acid Equation in water Acid A Acid B (a)[1 mark]For Acid A, explain what the presence of H^+ ions in solution tells you about the nature of the solution.
(b)[1 mark]For Acid B, how many moles of H^+ ions are formed from 1 mole of HB_2?
(c)[2 marks]Both Acid A and Acid B are added separately to water to make solutions.
Describe in terms of ions what occurs in each solution and which property they share.
(d)[1 mark]Explain, using one example from above, what is meant by the 'replaceable hydrogen' in acids.
Question 18
2 marks · Hard
Answer and see the solution →Name one metal compound (other than ammonia or sodium hydroxide) that makes water alkaline and write a balanced equation to show the formation of hydroxide ions in this solution.