Question

Write complete balanced chemical equations for the following reactions. Include states of matter

1. A solution of potassium carbonate reacts with hydrobromic acid.
2. Potassium sulfite powder reacts with sulfuric acid. (Think!)
3. Elemental iron reacts with hydrochloric acid (assume iron(III) is formed).

Answer 1

You add the states of matter.
1. A solution of potassium carbonate reacts with hydrobromic acid.
K2CO3 + 2HBr ==> CO2 + H2O + 2KBr
2. Potassium sulfite powder reacts with sulfuric acid. (Think!)
K2SO3 + H2SO4 ==> K2SO4 + H2SO3 but H2SO3 is a weak acid and will decompose to SO2 and H2O. Full equation is
K2SO3 + H2SO4 ==> K2SO4 + SO2 + H2O
3. Elemental iron reacts with hydrochloric acid (assume iron(III) is formed).
2Fe(s) + 6HCl(aq) ==> 2FeCl3(aq) + 3H2(g)