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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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Score/ 16

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

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