Question 1:
Predict the arrangement of the following substances in decreasing order of pH value.
Answer:
Bitter gourd juice, mineral water, orange juice, hydrochloric acid
Predict the arrangement of the following substances in decreasing order of pH value.
| Orange juice Bitter gourd juice Hydrochloric acid Mineral water |
Answer:
Bitter gourd juice, mineral water, orange juice, hydrochloric acid
Question 2:
Explain the reason why the labels of acid and alkali bottles have the symbol as in the diagram below.
Answer:
Acids and alkalis are corrosive
Explain the reason why the labels of acid and alkali bottles have the symbol as in the diagram below.
Answer:
Acids and alkalis are corrosive
Question 3:
The colour of liquid X changes from green to red when universal indicator is added.
(a) Determine whether liquid X is acidic, neutral or alkaline.
(b) Predict the colour of liquid X if a few drops of methyl orange are added into it.
Answer:
(a) Acidic
(b) Red
The colour of liquid X changes from green to red when universal indicator is added.
(a) Determine whether liquid X is acidic, neutral or alkaline.
(b) Predict the colour of liquid X if a few drops of methyl orange are added into it.
Answer:
(a) Acidic
(b) Red
Question 4:
Arrange the following substances in increasing order of acid strength.
Answer:
Fresh milk, pineapple juice, vinegar
Arrange the following substances in increasing order of acid strength.
| Pineapple juice: pH 4 Fresh milk: pH 6 Vinegar: pH 2 |
Answer:
Fresh milk, pineapple juice, vinegar