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Chapter 21: Problem 28

Write plausible equations for the (a) reaction of \(\mathrm{Al}(\mathrm{s})\) with \(\mathrm{Br}_{2}(1)\) (b) production of \(\mathrm{Cr}\) from \(\mathrm{Cr}_{2} \mathrm{O}_{3}(\mathrm{s})\) by the thermite reaction, with Al as the reducing agent; (c) separation of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) impurity from bauxite ore.

Short Answer

Expert verified
The balanced equations for the reactions are:\n(a) 2Al(s) + 3Br2(l) -> 2AlBr3(s),\n(b) 2Al(s) + Cr2O3(s) -> Al2O3(s) + 2Cr(s),\n(c) Fe2O3(s) + 3NaOH(l) -> 2NaFeO2(s) + H2O(l).

Step by step solution

01

Write and Balance the Equation for Reaction (a)

Firstly, consider the reaction between aluminium (Al) and bromine (Br2). When these two react, they will form aluminium bromide (AlBr3). The chemical equation is:\nAl(s) + Br2(l) -> AlBr3(s)\nHowever, this is not balanced, as there are 3 bromine atoms on the right side and 2 on the left. Therefore, the balanced chemical equation is:\n2Al(s) + 3Br2(l) -> 2AlBr3(s)
02

Write and Balance the Equation for Reaction (b)

The thermite reaction involves reduction of chromium (III) oxide (Cr2O3) to chromium using aluminium as the reducing agent. The reaction equation is: \nAl(s) + Cr2O3(s) -> Al2O3(s) + Cr(s)\nAgain, this isn't balanced. The balanced equation is:\n2Al(s) + Cr2O3(s) -> Al2O3(s) + 2Cr(s)
03

Write and Balance the Equation for Reaction (c)

The removal of iron (III) oxide impurity from bauxite (naturally occurring aluminium ore) is a key step in the production of aluminium. Caustic soda (NaOH) is often used to dissolve the impurity, while aluminium oxides remain insoluble. It forms sodium aluminate and water. The reaction is:\nFe2O3(s) + 3NaOH(l) -> 2NaFeO2(s) + H2O(l), which shows how Fe2O3 is separated from the bauxite ore.

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