CAIE A Level Chemistry 9701 · Chemistry of transition elements
When silver(I) chloride, , is treated with an excess of aqueous ammonia, the precipitate dissolves. Explain, in terms of ligand exchange, why the precipitate dissolves and why the ammonia is described as a ligand. In your answer, define the term ligand and describe the type of bond formed between the ammonia and the silver ion.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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