(a(i))[3]
Describe how to obtain a pure, dry sample of barium sulfate starting from aqueous barium chloride and dilute sulfuric acid.
(a(ii))[2]
State the ionic equation for this reaction, making sure to include state symbols.
(b)[3]
Excess barium carbonate is treated with $40.0\,\text{cm}^3$ of $1.50\,\text{mol dm}^{-3}$ hydrochloric acid. After purification, the percentage yield of barium chloride is $75.0\%$. Calculate the mass of barium chloride obtained. Give your answer to three significant figures. $[M_r: \text{BaCl}_2, 208]$
(c)[3]
A barium ion is written as $^{138}_{56}\text{Ba}^{2+}$. Fill in the table for this ion.