How is ammonium sulfate made in a lab?

1)25 cm3 of ammonia solution is measured using a measuring cylinder or pipette and poured into a conical flask. 2)Two drops of methyl orange indicator are added. This will turn yellow in the alkaline ammonia solution. 3)Dilute sulfuric acid is added from a burette slowly until the methyl orange indicator turns orange. If too much acid is added it will turn red. 4)The volume of sulfuric acid which has been added is recorded, and then the neutral solution of ammonium sulfate which contains the indicator is thrown away. 5)The experiment is repeated without the indicator but with the same volumes of ammonia and sulfuric acid. 6)The ammonium sulfate is crystallised by evaporating the