Question

Of the following anion Br^_, CO₃^-2, Cl^_, I^_, NO₃^-, PO₄^-3, SO₄^-2 and SO₃^-2, list those ions that meet the following criteria

a) gives a precipitate with Ag⁺ ion                ________________________

b) gives a precipitate with Ba⁺²                    ________________________

c) evolves a gas when acid is added             ________________________

d) releases an odorous gas as a product          ________________________

e) does not produce a precipitate in any classification or confirmatory reaction    ___________

2.     A solution contains a mixture of Cl^_ and Br ^_ ions. Can both be positively identified? Explain. Write appropriate equations to support your answer.

3. A solution is known to contain NO₃^_   anion. How could you confirm its presence?

4. Write the products and balance the following reactions:

Na₂SO₄   +    BaCl₂ →

                            

KBr    +   AgNO₃   →

Na₂CO₃    +     H₂SO₄   →

BaCl₂    +     Na₃PO₄   →

5. A BaCl₂ solution is added to an unknown sample. A white precipitate forms that dissolves when HNO₃ is added. No color, odor, or evolved gas is observed. Which anion is present? Describe a confirmatory reaction for this anion.

Answer 1

Ans 4

BaCl2 + Na2So4 = BaSo4 + 2 NaCl

Barium chloride + sodium sulfate = barium sulfate + sodium chloride

KBr(aq) + AgNO₃(aq) → AgBr(s) + KNO₃(aq)

Potassium bromide + silver nitrate = silver bromide + potassium nitrate

H₂SO₄(aq) + Na₂CO₃(s) = Na₂SO₄(aq) + H2O + CO₂(g)

Sulfuric acid + sodium carbonate = sodium sulfate + water + carbon dioxide

3 BaCl2 + 2 Na3PO4 = Ba3(PO4)2 + 6 NaCl

Barium chloride + Trisodium phosphate = barium orthophosphate + sodium chloride