required practical - making salts

Question 1

what is the reaction between to make soluble salt

Answer 1

copper oxide and dilute sulphuric acid

Question 2

what is the first stage

Answer 2

making of the soluble salt

Question 3

explain the steps of the first stage

Answer 3

1. start with a fixed amount of dilute sulphuric acid - limiting reactant
2. gently heat the acid until almost boiling
3. add small amounts of copper oxide to the acid
4. stir using a metal rod
5. copper oxide will react and seem to disappear and will turn a blue colour
6. keep adding copper oxide if the solution continues to be clear blue and stop when the copper oxide stops mixing

Question 4

what is the second stage

Answer 4

filtration to remove the unreacted cooper oxide

Question 5

what is the final stage

Answer 5

making the crystals

Question 6

explain the final stage

Answer 6

1. place the solution into an evaporating dish
2. heat gently over a beaker of boiling water
3. heat until around half the solution remains
4. leave solution for 24 hours in a cool place
5. finally scrape crystals onto a paper towel and pat dry