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Identification

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Total cards: 16•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (16)

#1
Front (Question)

Test for carbon dioxide:

Back (Answer)

Bubble the gas through limewater (calcium hydroxide - CaOH). Carbon dioxide turns limewater a milky color.

#2
Front (Question)

Test for ammonia:

Back (Answer)

• use a drop of concentrated HCl; dense white fumes should be produced • use damp red litmus paper; it should turn blue

#3
Front (Question)

Test for hydrogen:

Back (Answer)

Use a lighted splinter. The gas should burn with a ‘pop’ sound.

#4
Front (Question)

Test for oxygen:

Back (Answer)

Use a glowing splinter. The gas should rekindle the glowing splinter.

#5
Front (Question)

Test for sulphur dioxide (SO2):

Back (Answer)

Bubble the gas through acidified potassium dichromate (K2Cr2O7). The orange solution should turn green.

#6
Front (Question)

Test for carbonate:

Back (Answer)

Add dil. HCl and pass the liberated gas through limewater. It should turn milky and form effervescence (lots of bubbles).

#7
Front (Question)

Test for chloride/bromide/iodide:

Back (Answer)

Add dil. HNO3 + aq. silver nitrate (AgNO3) OR dil. lead nitrate (Pb(NO3)2) Chloride should form white ppt. insoluble in acid, bromide should form cream ppt., and iodide should form yellow ppt., with same characteristic.

#8
Front (Question)

Test for sulphate:

Back (Answer)

Add dil. HCl + barium chloride OR barium nitrate. It should form white ppt. insoluble in acid.

#9
Front (Question)

Test for nitrate:

Back (Answer)

Add aluminium powder and excess aq. NaOH. Heat and mix it, then test the gas with: i) red litmus: turns blue ii) conc. HCl: forms dense white fumes

#10
Front (Question)

Test for ammonium:

Back (Answer)

Adding aq. NaOH: no ppt. If the mixture is warmed, a pungent-smelling gas that turns litmus paper blue will be produced. Adding aq. NH3: no ppt.

#11
Front (Question)

Test for calcium:

Back (Answer)

Adding aq. NaOH: forms white ppt (insoluble in excess). Adding aq. NH3: no ppt.

#12
Front (Question)

Test for aluminium:

Back (Answer)

Add aq. NaOH: forms white ppt. soluble in excess NaOH to form a colourless solution. Add aq. NH3: forms white ppt. insoluble in excess NH3.

#13
Front (Question)

Test for zinc:

Back (Answer)

Adding aq. NaOH: white ppt. forms, soluble in excess NaOH. Adding aq. NH3: white ppt. forms, soluble in excess NH3 to form a colourless solution.

#14
Front (Question)

Test for cupric (Cu2+):

Back (Answer)

Adding aq. NaOH: forms blue ppt., insoluble in excess. Adding aq. NH3: forms blue ppt., soluble in excess NH3 to form a dark blue solution.

#15
Front (Question)

Test for ferrous (Fe2+):

Back (Answer)

Adding aq. NaOH: forms green ppt., insoluble in excess. Adding aq. NH3: forms green ppt., insoluble in excess.

#16
Front (Question)

Test for ferric (Fe3+):

Back (Answer)

Adding aq. NaOH: forms brown ppt., insoluble in excess. Adding aq. NH3: forms brown ppt., insoluble in excess.