Of the following anion Br _ , CO 3 -2 , Cl _ , I _ , NO 3 - , PO 4 -3 , SO 4 -2
ID: 104346 • Letter: O
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.
Explanation / Answer
Ans 4
BaCl2 + Na2So4 = BaSo4 + 2 NaCl
Barium chloride + sodium sulfate = barium sulfate + sodium chloride
KBr(aq) + AgNO(aq) AgBr(s) + KNO(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
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