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Topic Content:
- Theory Questions & Answers – Qualitative Analysis II
Theory Questions – Qualitative Analysis II:
1. (a). Describe briefly one chemical test that can be used to distinguish between
(i). NH4+ and Al3+
(ii). Cu2+ and Fe2+
(iii). Zn2+ and Pb2+
(b). Give the colour of the precipitate formed by each of the following ions on reaction with NaOH(aq).
(i). Zn2+ (ii). Pb2+ (iii). Cu2+ (iv). Fe2+ and (v). Fe3+
2. D is an inorganic salt. E is a solution of an inorganic salt. The tests recorded in the table below were performed on D and E.
Copy and complete the table.
| Test | Observation | Inference | |
| (a) | D + distilled water | Did not dissolve | |
| (b) | D + dil. HCI + heat | Dissolved to form blue or greenish-blue solution | |
| (c) | Solution of D + NaOH(aq) in drops then in excess | Blue gelatinous precipitate | |
| (d) | Solution of D + NH3(aq) in drops then in excess | | Cu2+ present Cu2+ confirmed |
| (e) | (i) E(aq) + NaOH(aq) in drops and in excess | No precipitate | |
| (ii) Mixture in 2(e)(i) warmed | NH3 gas evolved, therefore NH4+ present | ||
| (f) | E(aq) +BaCl2(aq) | White chalky precipitate. No gas evolved, precipitate did not dissolve |
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