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Read indicator colours to find pH

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS1-2, NGSS.SEP 4 · England: KS3 Chemistry: Acids and alkalis

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1
Question 1
A solution has a pH of 8. What colour will universal indicator turn?
- A. purple
- B. orange or yellow
- C. green
- D. blue
2
Question 2
A pH meter is better than universal indicator when…
- A. you want a rainbow of colours
- B. you are testing a solid
- C. the solution is colourless
- D. you need a precise numerical pH
3
Question 3
Universal indicator results: vinegar pH 3, soapy water pH 10, oven cleaner pH 13, milk pH 6. Which is the most alkaline?
- A. milk
- B. vinegar
- C. soapy water
- D. oven cleaner
4
Question 4
A solution has a pH of 0. What colour will universal indicator turn?
- A. purple
- B. orange or yellow
- C. blue
- D. red
5
Question 5
Blue litmus paper is dipped into lemon juice. What happens?
- A. It turns purple
- B. It stays blue
- C. It turns red
- D. It turns green
6
Question 6
Universal indicator results: baking soda solution pH 9, oven cleaner pH 13, lemon juice pH 2, soapy water pH 10. Which is the most acidic?
- A. soapy water
- B. lemon juice
- C. baking soda solution
- D. oven cleaner
7
Question 7
A solution has a pH of 7. What colour will universal indicator turn?
- A. orange or yellow
- B. purple
- C. green
- D. blue
8
Question 8
Why is universal indicator more useful than litmus for comparing two acids?
- A. It shows a range of colours, so it gives an approximate pH
- B. It is always green
- C. Litmus does not react with acids
- D. It only works on acids
9
Question 9
Universal indicator results: baking soda solution pH 9, oven cleaner pH 13, milk pH 6, pure water pH 7. Which is the most alkaline?
- A. oven cleaner
- B. baking soda solution
- C. milk
- D. pure water
10
Question 10
A solution has a pH of 1. What colour will universal indicator turn?
- A. red
- B. orange or yellow
- C. blue
- D. green
11
Question 11
Why is universal indicator more useful than litmus for comparing two acids?
- A. It shows a range of colours, so it gives an approximate pH
- B. Litmus does not react with acids
- C. It only works on acids
- D. It is always green
12
Question 12
Universal indicator results: baking soda solution pH 9, soapy water pH 10, lemon juice pH 2, milk pH 6. Which is the most alkaline?
- A. milk
- B. lemon juice
- C. soapy water
- D. baking soda solution
13
Question 13
A solution has a pH of 5. What colour will universal indicator turn?
- A. purple
- B. orange or yellow
- C. red
- D. green
14
Question 14
Blue litmus paper is dipped into lemon juice. What happens?
- A. It turns green
- B. It stays blue
- C. It turns red
- D. It turns purple
15
Question 15
Universal indicator results: soapy water pH 10, milk pH 6, baking soda solution pH 9, vinegar pH 3. Which is the most acidic?
- A. milk
- B. soapy water
- C. vinegar
- D. baking soda solution
16
Question 16
A solution has a pH of 5. What colour will universal indicator turn?
- A. orange or yellow
- B. blue
- C. purple
- D. red

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Answer key: Read indicator colours to find pH

1. D. blue
2. D. you need a precise numerical pH
3. D. oven cleaner
4. D. red
5. C. It turns red
6. B. lemon juice
7. C. green
8. A. It shows a range of colours, so it gives an approximate pH
9. A. oven cleaner
10. A. red
11. A. It shows a range of colours, so it gives an approximate pH
12. C. soapy water
13. B. orange or yellow
14. C. It turns red
15. C. vinegar
16. A. orange or yellow