Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Other alkaline solutions
18 practice questions
Practice questions
1–10 of 18
Question 1
1 mark · Easy
Answer and see the solution →State the ion responsible for the alkalinity of sodium hydroxide solution.
Question 2
3 marks · Easy
Answer and see the solution →Potassium carbonate ([32mK_2CO_3[0m) can make water alkaline without containing hydroxide ions in its formula.
(a)[1 mark]Write the formula of the ion that makes a solution alkaline.
(b)[2 marks]Explain, using a chemical equation, how potassium carbonate forms an alkaline solution in water.
Question 3
2 marks · Easy
Answer and see the solution →Magnesium hydroxide ([32mMg(OH)_2[0m) is often used as an antacid. It does not dissolve well in water, but any dissolved part is alkaline. Explain why a solution of magnesium hydroxide is alkaline.
Question 4
1 mark · Easy
Answer and see the solution →Name a substance, other than ammonia, that forms an alkaline solution when dissolved in water.
Question 5
3 marks · Easy
Answer and see the solution →Read the passage and answer the questions below. Acids release hydrogen ions ([32mH^+[0m) in water, making the solution acidic.
(a)[1 mark]Name the ion formed in solution when hydrochloric acid is added to water.
(b)[1 mark]Give the symbol for this ion.
(c)[1 mark]Explain, using the equation, what happens when [32mHCl[0m is dissolved in water.
Question 6
3 marks · Easy
Answer and see the solution →The following table shows the formulae of several acids. Use the table to answer the questions below.
Table 1. Some common acids and their formulae. Acid Formula Hydrochloric acid HCl Nitric acid HNO₃ Sulfuric acid H₂SO₄ Phosphoric acid H₃PO₄ Ethanoic acid CH₃COOH (a)[1 mark]Identify the ion that all acids in the table produce when dissolved in water.
(b)[1 mark]State the chemical symbol and charge of this ion.
(c)[1 mark]Explain, using the formulae in the table, how you know that each acid can form this ion.
Question 7
2 marks · Easy
Answer and see the solution →A student dissolves 0.20 mol of sodium carbonate (Na_2CO_3) in enough water to make 1.0 dm³ of solution. Sodium carbonate forms an alkaline solution because it reacts to produce hydroxide ions.
Calculate the concentration of carbonate ions (CO_3^{2-}) present in the solution. Give your answer in mol/dm³.
Question 8
2 marks · Normal
Answer and see the solution →State the name and the formula of the ion responsible for acidity in aqueous solutions.
(a)[1 mark]Name of the ion:
(b)[1 mark]Formula of the ion:
Question 9
4 marks · Normal
Answer and see the solution →Potassium carbonate and ammonia both form alkaline solutions in water.
(a)[2 marks]Write a balanced chemical equation to show how ammonia forms an alkaline solution when dissolved in water.
(b)[2 marks]State the name and formula of the ion responsible for alkalinity in these solutions.
Question 10
3 marks · Normal
Answer and see the solution →Explain why a solution of sodium carbonate in water is alkaline, even though sodium carbonate does not contain hydroxide ions in its original formula.