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 359 · Easy
Question 251
3 marks · Easy
Answer and see the solution →(a)[1 mark]Titration Results Titration Initial burette reading / cm³ Final burette reading / cm³ 1 0.70 18.35 2 1.40 19.80 3 2.00 20.45 Calculate the titre (volume delivered) for Titration 1.
(b)[1 mark]Which titration is likely to be the rough (trial) titration? Give a reason for your answer.
(c)[1 mark]Suggest why the average titre is calculated using only concordant results.
Question 252
1 mark · Easy
Answer and see the solution →State the name of the procedure used to determine the volume of acid needed to neutralise a fixed volume of alkali.
Question 253
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe how you would add the alkali during a titration to obtain an accurate result.
(b)[1 mark]Explain why the conical flask should be swirled during the titration.
(c)[1 mark]State how the endpoint of the titration is recognised.
Question 254
2 marks · Easy
Answer and see the solution →A student starts a titration with the burette reading at 3.55 cm³. When the reaction is complete, the reading is 20.00 cm³. Calculate the volume of solution added from the burette.
Question 255
5 marks · Easy
Answer and see the solution →Vinegar and household ammonia are tested using two different indicators:
(a)[1 mark]State which solution is acidic and which is alkaline.
(b)[1 mark]A drop of vinegar is placed on blue litmus paper. Describe what is observed.
(c)[2 marks]Household ammonia is tested with universal indicator. Name the colour you would expect and explain what this indicates about its pH.
(d)[1 mark]Explain how universal indicator is used to measure the pH of a solution.
Question 256
5 marks · Easy
Answer and see the solution →The table below shows the colours of three indicators in different solutions.
Indicator results for solutions A, B and C. Solution Litmus Phenolphthalein Methyl orange A Red Colourless Red B Blue Pink Yellow C Purple Colourless Yellow (a)[3 marks]Using the table, state which solution is acidic, which is alkaline, and which is neutral. Explain your answers using indicator colours.
(b)[2 marks]For solution B, state what the pH is likely to be, and justify your answer.
Question 257
5 marks · Easy
Answer and see the solution →Two solutions, X and Y, are tested:
Test results with universal indicator and methyl orange. Solution Universal indicator colour Methyl orange colour X Orange Red Y Blue Yellow (a)[2 marks]Estimate the pH value for each solution from the universal indicator colour. Show your reasoning.
(b)[2 marks]Classify each solution as strongly acidic, weakly acidic, neutral, weakly alkaline, or strongly alkaline based on your estimated pH values.
(c)[1 mark]Referring to the methyl orange results, explain whether your classifications are supported. Give reasons for your answer.
Question 258
5 marks · Easy
Answer and see the solution →A student tests a sample of rainwater using universal indicator paper. The paper turns yellow-green.
(a)[2 marks]What does the colour yellow-green indicate about the pH of the rainwater? Estimate the pH value.
(b)[1 mark]Is the rainwater acidic, neutral or alkaline? Explain your answer.
(c)[2 marks]Describe how you would use universal indicator solution, rather than paper, to measure the pH of rainwater.
Question 259
1 mark · Easy
Answer and see the solution →State the products formed when iron reacts with dilute hydrochloric acid.
Question 260
3 marks · Easy
Answer and see the solution →Answer the following questions about acids and bases in terms of proton transfer.
(a)[1 mark]Define an acid in terms of proton transfer.
(b)[1 mark]Define a base in terms of proton transfer.
(c)[1 mark]State whether ammonia (NH₃) acts as an acid or a base when it reacts with hydrogen chloride gas. Explain your answer in terms of proton transfer.