(a)[3]
Fill in the table below.
(b)[3]
Using enthalpy changes, explain why $\text{WO}_n^{2-}$ gives a white precipitate with $\text{Ba}^{2+}(aq)$ but produces no visible change with $\text{Mg}^{2+}(aq)$.
Chemistry 9701 · AS & A Level · Chemical energetics
Chemical energetics — practice question
V and W are elements that sit in neighbouring groups of the Periodic Table.
V reacts with oxygen to produce an acidic gas, X. V also forms an anion with formula $\text{VO}_m^-.$
W reacts with oxygen to produce an acidic gas, Y. W also forms an anion with formula $\text{WO}_n^{2-}.$
A solution of $\text{WO}_n^{2-}$ gives a white precipitate with $\text{Ba}^{2+}(aq)$ but there is no visible change with $\text{Mg}^{2+}(aq)$.