M3 - Qualitative Analysis
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Write an ionic equation, with state symbols, for the reaction of chloride ions and silver nitrate
Ag+ (aq) + Cl- (aq) -> AgCl (s)
What reagent(s) are required for the sulfate test?
(Acidified) Barium nitrate
What reagent(s) are required for the carbonate test?
Nitric acid
What positive observation is made for the sulfate test?
White precipitate (of BaSO4)
What is the formulae of the carbonate ion?
CO32-
Write an ionic equation, with state symbols, for the reaction of carbonate ions and nitric acid
CO32- (aq) + 2H+ (aq) -> CO2 (g) + H2O (l)
What is the order of anion tests for an unknown sample?
Carbonate And Sulfate, Halide (CASH)
What positive observation is made for the ammonium test?
Damp red litmus paper turns blue (due to alkaline gas produced)
What positive observation is made for the carbonate test?
Effervescence, fizzing, bubbling
Write an ionic equation, with state symbols, for the reaction of sulfate ions and barium nitrate
SO42- (aq) + Ba2+ (aq) -> BaSO4 (s)
What reagent(s) are required for the ammonium test?
Warm NaOH solution
How are silver halide precipitates distinguished?
Add diulte ammonia: * White AgCl precipitate re-dissolves * Cream AgBr and Yellow AgI precipitates do not re-dissolve Add concentrated ammonia: * Cream AgBr precipitate re-dissolves * Yellow AgI precipitate is insoluble
Write an ionic equation, with state symbols, for the reaction of ammonium ions and sodium hydroxide
OH- (aq) + NH4+ (aq) -> NH3 (g) + H2O (l)
D
What reagent(s) are required for the halide test?
(Acidified) silver nitrate
D
D
What positive observation is made for each halide test (chloride, bromide and iodide) ?
White ppt for chloride (AgCl) Cream ppt for bromide (AgBr) Yellow ppt for iodide (AgI)
What is the formula of the sulfate ion?
SO42-
Heat with a hydroxide (1) pH/litmus/indicator paper turns blue/purple (1)
D
Test for Br-: Silver Nitrate (AgNO3) AND a cream precipitate (1) Ag+(aq) + Br-(aq) –> AgBr(s) (1) Test for NH4+: Heat with hydroixde (1) pH/indicator paper turns blue/purple/alkaline (1) NH4+ + OH- –> NH3 + H2O (1)