Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
251–260 of 374 · Normal
Question 251
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 252
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 253
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.
Question 254
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 255
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 256
2 marks · Normal
Answer and see the solution →State the formula of the ion present in all alkaline solutions and give its charge.
Question 257
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 258
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 259
2 marks · Normal
Answer and see the solution →State the piece of apparatus used to measure out a precise volume of liquid in a titration, and the apparatus used to hold the liquid that is being titrated.
Question 260
4 marks · Normal
Answer and see the solution →A student wants to find out how much sodium hydroxide solution is needed to neutralise 25.0 cm³ of dilute hydrochloric acid using phenolphthalein as the indicator. Describe the main steps to carry out this titration accurately.
(a)[1 mark]State the first step to prepare the acid sample for titration.
(b)[1 mark]Describe how the student should handle the burette and indicator.
(c)[2 marks]Explain how to know when the endpoint is reached and what to do as it approaches.