(a(i))[1]
Suggest why universal indicator is not appropriate for this titration.
(a(ii))[1]
Name an indicator suitable for use in this titration.
(b)[5]
Describe how to obtain a pure sample of sodium sulfate crystals from the original dilute sulfuric acid and aqueous sodium hydroxide solutions of the same concentrations. You do not need to include details of carrying out the titration.
(c(i))[1]
Use a flame test on X. State the observations.
(c(ii))[2]
Copper(II) oxide is heated with excess X. State the observations.
(c(iii))[1]
Acidified aqueous barium nitrate is added to X. State what is observed.