Question

(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?

Answer 1

Answer:

(a) The pH of pure water will be 7.  Water having a pH lower than 7 is considered acidic, and pH greater than 7 as basic.

(b) An aqueous solution of sugar will turn the universal indicator's colour as green, as the sugar solution is always neutral in nature.

(c) As the sample of rain water turned universal indicator paper yellow, this means that is a weak acid. Therefore the pH of the given sample of rain water will be between 5 and 6.