Question

SO4 2-, CO3 2-, NO2 - , Cl- , Br- , I - , and NO3 -

1) List all the anions in this lab that are identified using:

a) Precipitation reactions

              b) redox reactions

             c) acid-base reactions

             d) gas-forming reactions

2. Write a balanced chemical quation for the reaction of one of the anion in each of the categries in equation 1.

   a) A precipitation reaction

b) A redox reaction

c) An acid-base reaction

d) A gas -forming reaction

Answer 1

A precipitation reaction is one in which a solid precipitate is formed. A redox reaction involves a transfer of electrons between two species. Acid-base reactions are the neutralization reaction between an acid and a base. In gas forming reactions, one of the product is a gas

Therefore,

a) Precipitation reactions

SO₄^2- , Cl^- , Br^- , I^-

b) redox reactions

NO₂^- and NO₃^-

c) acid-base reactions

CO₃^2-

d) gas-forming reactions

CO₃^2- and NO₂^-

2. Write a balanced chemical equation for the reaction of one of the anion in each of the categories in equation 1.

a) A precipitation reaction

Ca²⁺(aq) + SO₄^2-(aq)      CaSO₄(s)

b) A redox reaction

2NO₂^-(aq)     NO(aq) + NO₃^-(aq)

c) An acid-base reaction

CaCO₃(s) + 2H⁺(aq)       Ca²⁺(aq) + CO₂(g) + H₂O(l)

d) A gas-forming reaction

CaCO₃(s) + 2H⁺(aq) Ca²⁺(aq) + CO₂(g) + H₂O(l)