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Module 8: Applying Chemical Ideas

Quick questions on Cation and anion identification tests explained: HSC Chemistry Module 8

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are complexation tests?
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Complexation distinguishes ions that give similar precipitates by re-dissolving one in excess reagent through formation of a soluble complex ion.
What is copper with ammonia?
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Add dilute NH3NH_3 to a Cu2+Cu^{2+} solution; pale blue Cu(OH)2Cu(OH)_2 forms, then with excess ammonia it dissolves to give the deep blue tetraammine complex:
What is iron with thiocyanate?
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Add KSCNKSCN to a Fe3+Fe^{3+} solution; a deep blood-red complex forms:
What is q1?
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State the flame test colour for each of: Li+Li^+, Na+Na^+, K+K^+, Ca2+Ca^{2+}, Cu2+Cu^{2+}. [3 marks]
What is q2?
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A solution gives a white precipitate with acidified AgNO3AgNO_3 that dissolves in dilute ammonia. Calculate the mass of chloride ion in 50 mL of the solution if 0.072 g of AgClAgCl is recovered. [3 marks]
What is q3?
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A solution gives a pale-green precipitate with NaOH that darkens on standing. (a) Identify the cation. (b) Write the net ionic equation.

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