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
561–570 of 869
Question 561
4 marks · Normal
Answer and see the solution →The table shows the effect of three indicators in different solutions.
Solution Litmus Methyl orange Phenolphthalein Vinegar red red colourless Soapy water blue yellow pink (a)[2 marks]State which solution is acidic. Explain your answer using the indicator results.
(b)[2 marks]State which solution is alkaline. Explain your answer using the indicator results.
Question 562
1 mark · Normal
Answer and check →Which pH value shows a strongly alkaline solution?
- A.pH 2
- B.pH 6
- C.pH 9
- D.pH 13
Question 563
2 marks · Normal
Answer and see the solution →Name two indicators that can distinguish between an acid and an alkali, and state the colour each shows in an alkali.
Question 564
4 marks · Normal
Answer and see the solution →A teacher gives three solutions: X with pH 3, Y with pH 7, and Z with pH 12.
(a)[3 marks]Classify each solution as acidic, neutral, or alkaline.
(b)[1 mark]State which solution is strongly acidic and which is strongly alkaline.
Question 565
2 marks · Hard
Answer and see the solution →State the colours that phenolphthalein and methyl orange turn in a strongly alkaline solution.
Question 566
5 marks · Hard
Answer and see the solution →An unknown solution is tested with universal indicator. The indicator turns blue-green and the estimated pH is 8.
(a)[2 marks]Use the pH scale to classify the solution as strongly acidic, weakly acidic, neutral, weakly alkaline, or strongly alkaline. Give a reason for your answer.
(b)[1 mark]State what the pH value tells you about the concentration of hydrogen ions compared to a solution of pH 7.
(c)[2 marks]Describe how you would use universal indicator to estimate the pH of an aqueous solution. Include what you would observe and what you would compare it to.
Question 567
2 marks · Hard
Answer and see the solution →Explain how adding an acid to an alkaline solution changes its pH. State what happens to the indicator colour if universal indicator is used throughout.
Question 568
1 mark · Easy
Answer and see the solution →State the pH value that classifies a solution as neutral.
Question 569
3 marks · Easy
Answer and see the solution →A student is given a solution and asked to measure its pH using universal indicator.
(a)[2 marks]Describe how the student should use universal indicator solution to estimate the pH of the solution.
(b)[1 mark]Explain how the student can decide on the pH value after adding the indicator.
Question 570
2 marks · Easy
Answer and see the solution →Table 1 shows the colour changes of three common indicators in different solutions.
Table 1: Indicator colours in acid and alkali Indicator Colour in Acid Colour in Alkali Litmus red ? Methyl orange red yellow Phenolphthalein ? pink (a)[2 marks]Complete the table by giving the colour of litmus in alkali and phenolphthalein in acid.