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3.1.4 qualitative analysis

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Total cards: 6•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

Test for carbonate

Back (Answer)

Add dilute acid and observe effervescence Bubble gas through limewater. CO2 - will turn limewater cloudy 2HCl + Na2CO3 > 2NaCl + H2O + CO2

#2
Front (Question)

Test for sulfate

Back (Answer)

Acidified BaCl2 used as reagent Will form white precipitate Ba2+ + SO4^2- > BaSO4 (s)

#3
Front (Question)

Testing for halide ions

Back (Answer)

Test solution is made acidic with nitric acid Add Silver nitrate - AgNO3 Chlorine - white Bromine - cream Iodine - pale yellow Nitric acid reacts with any carbonates to prevent formation of precipitate Ag2CO3

#4
Front (Question)

If halide colour too similar

Back (Answer)

AgCl dissolves in dilute ammonia AgBr dissolves in concentrated ammonia AgI doesnt react - too insoluble

#5
Front (Question)

Sequence of tests

Back (Answer)

Carbonate, sulfate then halide Prevents false results as both BaCO3 and Ag2SO4 are insoluble

#6
Front (Question)

Testing for positive ions (cations)

Back (Answer)

Test for NH4+ Reaction with warm NaOH, forming NH3 gas Turns red litmus paper blue