practicals-pure salts

Question 1

making pure salts (ALL OF THE STEPS)

Answer 1

start with fixed volume of dilute sulfuric acid, our limiting reactant

gently heat acid until almost boiling

use a spatula and add small amounts of copper oxide to acid

stir solution using a glass rod

the copper oxide will react and seem to disappear

continue adding if the solution continues to be clear blue

stop adding if some powder remains after stirring

at this point reaction stopped, all acid has reacted
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use filtration to remove unreacted copper oxide

place solution in an evaporating basin, heat gently over a beaker of boiling water

heat until half solution reamins

leave solution for 24 hours in a cool place for cystals to form

scrape crystals onto paper towel and pat them dry