Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Acids, Alkalis and Titrations
83 practice questions
Topics covered
Practice questions
1–10 of 35 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State what colour phenolphthalein turns in an acidic solution.
Question 2
3 marks · Easy
Answer and see the solution →Classify each solution by its pH.
(a)[1 mark]A solution has a pH of 2. State whether it is strongly acidic, weakly acidic, neutral, weakly alkaline, or strongly alkaline.
(b)[1 mark]A solution has a pH of 9. What type of solution is this according to the pH scale?
(c)[1 mark]A solution has a pH of 7. What type of solution is this?
Question 3
2 marks · Easy
Answer and see the solution →A student tests two solutions with litmus paper. Solution X turns blue litmus red. Solution Y turns red litmus blue. How many solutions are acidic?
Question 4
2 marks · Easy
Answer and see the solution →Explain why a solution with a pH of 5 is not considered strongly acidic. Include information about the pH scale in your answer.
Question 5
3 marks · Easy
Answer and see the solution →Results of adding indicators to three unknown solutions. Solution Litmus (colour) Methyl orange (colour) Phenolphthalein (colour) A red red colourless B blue yellow pink C blue yellow colourless Use the table to answer the following questions about solutions A, B, and C.
(a)[1 mark]Which solution is acidic?
(b)[1 mark]Which solution is alkaline?
(c)[1 mark]Which indicator could you use to distinguish solutions B and C? State the colour it would show for each.
Question 6
1 mark · Easy
Answer and see the solution →State the pH value of a neutral solution.
Question 7
3 marks · Easy
Answer and see the solution →Some students are testing three household substances with universal indicator.
(a)[1 mark]Explain what universal indicator does when added to an aqueous solution.
(b)[1 mark]A solution turns orange with universal indicator. State if this solution is acidic, neutral or alkaline.
(c)[1 mark]Which household substance is likely to give a universal indicator colour of purple? Choose from: vinegar, tap water, sodium bicarbonate solution, bleach.
Question 8
2 marks · Easy
Answer and see the solution →A solution has a pH of 10. How many whole numbers above the neutral pH is this solution? Show your working.
Question 9
1 mark · Easy
Answer and see the solution →State the pH value that classifies a solution as neutral.
Question 10
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.