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SingaporeCombined ScienceQuick questions
Chemistry: Reactions, Acids and Salts
Quick questions on Salt preparation and solubility rules explained: O-Level Combined Science
7short 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 the solubility rules?Show answer
You need a working set of rules:
What is preparing a soluble salt by excess solid?Show answer
When the salt is soluble and the base, metal or carbonate is insoluble, add it in excess to the acid:
What is preparing a soluble salt by titration?Show answer
When both reactants are soluble (e.g. a soluble alkali such as sodium hydroxide with an acid), you cannot use excess, because any leftover would dissolve and contaminate the salt. Instead:
What is preparing an insoluble salt by precipitation?Show answer
When the salt is insoluble, mix two soluble solutions that supply the right ions; the insoluble salt drops out as a precipitate:
What is q1?Show answer
State the solubility rule for nitrates and for sodium salts. [2 marks]
What is q2?Show answer
A salt is soluble and is made from an insoluble carbonate. Name the preparation method and say why excess carbonate is used. [2 marks]
What is q3?Show answer
Write the ionic equation for the precipitation of silver chloride and state its colour. [2 marks]
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