Which pair of reactants is used to make a soluble salt, copper(II) sulfate, by adding excess solid to warm acid?
Answer and explanation
Correct answer: B. copper(II) oxide and sulfuric acid
- Step 1: A metal oxide plus an acid gives a salt and water.
- Step 2: ; the excess solid is filtered off.
Answer
copper(II) oxide and sulfuric acid.
Why not the others: copper metal and sulfuric acid: copper does not react with dilute acids. copper(II) oxide and hydrochloric acid: gives copper(II) chloride. copper(II) sulfate and sodium hydroxide: gives copper(II) hydroxide precipitate.
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