making salts Flashcards
copper sulphate salt
What type of reaction is used to make soluble salts from an insoluble base and an acid?
Neutralisation – sulfuric acid reacts with copper oxide (the insoluble base) to form copper sulfate (salt) and water.
Why do you warm the sulfuric acid before adding copper oxide in the salt-making process?
Warming the acid speeds up the reaction, allowing the copper oxide to dissolve more easily in the acid.
Why do you add excess copper oxide to the sulfuric acid
To ensure that all the sulfuric acid reacts and is neutralised, leaving excess copper oxide at the end.
What do you do after excess copper oxide has been added to the sulfuric acid?
Filter the mixture to remove the excess copper oxide (which has not reacted with the acid)
Why do you evaporate the filtrate in the copper sulfate salt-making process?
To remove water and concentrate the copper sulfate solution, leaving behind copper sulfate crystals.
How do you obtain dry copper sulfate crystals?
Leave the hot, saturated solution to cool so crystals can form. Then, filter the copper sulfate crystals and dry them using filter paper or by placing them in a warm place.
What is the purpose of filtering the mixture during the copper sulfate-making process?
Filtering removes the excess unreacted copper oxide, ensuring that only the neutralised solution containing copper sulfate remains
What is the name of the salt formed when sulfuric acid reacts with copper oxide?
The salt formed is copper sulfate (CuSO₄).
