ICSE 1998 : SCIENCE Paper 2 (Chemistry) - Question 1(e) Answer the following.

SCIENCE
Paper 2 (Chemistry) - 1998
(One hour and a half)

Question 1
(e) The compound Na₂B₄O₇.10H₂O is commonly known as borax. When litmus is added to a solution of borax it turns blue.

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19.
(i) What can you say about the pH of borax solution?

20.
(ii) Calculate the percentage of boron (B) in borax.
(H = 1, B = 11, O = 16, Na = 23) (Answer correct to 1 decimal place).

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