(a) What would you expect the pH of pure water to be?
(b) What colour would the universal indicator show in an aqueous solution of sugar? Why?
(c) A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

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Solution

a. Pure water is a neutral substance with a pH of 7.

b. A universal indicator will show a green colour in a sugar solution (which is the colour for pH 7). An aqueous solution of sugar is also a neutral substance. Hence, its pH value is 7.

c. A universal indicator shows a greenish-yellow colour for pH 6 and orange yellow for pH 5. This means that if the indicator turns yellow, the pH should be between these two values. Hence, it must have a pH value between 5 and 6. As the pH is closer to 7 (between 5 and 6), it is a weak acid.

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(a) What would you expect the pH of pure water to be? (b) What colour would the universal indicator show in an aqueous solution of sugar? Why? (c) A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

(a) What would you expect the pH of pure water to be?
(b) What colour would the universal indicator show in an aqueous solution of sugar? Why?
(c) A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?