RP4 - TESTING FOR IONS

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

What are the tests for group 2 ions?

Back (Answer)

• add NaOH then add more NaOH or • add H2SO4 then add more H2SO4

Front (Question)

What is the +ve result for Mg^2+ with NaOH and with excess NaOH?

Back (Answer)

• NaOH: slight white precipitate • excess NaOH: white precipitate

Front (Question)

What is the +ve result for Ca^2+ with NaOH and with excess NaOH?

Back (Answer)

• NaOH: slight white precipitate • excess NaOH: slight white precipitate

Front (Question)

What is the +ve result for Sr^2+ with NaOH and with excess NaOH?

Back (Answer)

• NaOH: slight white precipitate • excess NaOH: slight white precipitate

Front (Question)

What is the result for Ba^2+ with NaOH and with excess NaOH?

Back (Answer)

• NaOH: no change (colourless solution) • excess NaOH: no change (colourless solution)

Front (Question)

What is the +ve result for Mg^2+ with H2SO4 and with excess H2SO4?

Back (Answer)

• H2SO4: slight white precipitate • excess H2SO4: colourless solution

Front (Question)

What is the +ve result for Ca^2+ with H2SO4 and with excess H2SO4?

Back (Answer)

• H2SO4: slight white precipitate • excess H2SO4: slight white precipitate

Front (Question)

What is the +ve result for Sr^2+ with H2SO4 and with excess H2SO4?

Back (Answer)

• H2SO4: white precipitate • excess H2SO4: white precipitate

Front (Question)

What is the +ve result for Ba^2+ with H2SO4 and with excess H2SO4?

Back (Answer)

• H2SO4: white precipitate • excess H2SO4: white precipitate

#10

Front (Question)

What is the test for ammonium (NH4^+) ions?

Back (Answer)

• add NaOH • warm gently • hold damp red litmus paper in the mouth of the test tube

#11

Front (Question)

What is the +ve result for ammonium (NH4^+) ions?

Back (Answer)

damp red litmus paper turns blue

#12

Front (Question)

What is the test for OH^- ions?

Back (Answer)

damp red litmus paper

#13

Front (Question)

What is the +ve result for OH^- ions?

Back (Answer)

damp red litmus paper turns blue

#14

Front (Question)

What is the test for CO3^2- ions?

Back (Answer)

• add HCl • bubble gas produced through limewater

#15

Front (Question)

What is the +ve result for CO3^2- ions?

Back (Answer)

limewater turns cloudy

#16

Front (Question)

What is the test for SO4^2- ions?

Back (Answer)

• add HCl • add BaCl2

#17

Front (Question)

What is the +ve result for SO4^2- ions?

Back (Answer)

white precipitate

#18

Front (Question)

What is the test for halide ions?

Back (Answer)

• add HNO3 • add AgNO3

#19

Front (Question)

What is the +ve result for Cl^- ions?

Back (Answer)

white precipitate

#20

Front (Question)

What is the +ve result for Br^- ions?

Back (Answer)

cream precipitate

#21

Front (Question)

What is the +ve result for I^- ions?

Back (Answer)

yellow precipitate

#22

Front (Question)

What happens when you add dilute NH3 to a positive result of Cl^- ions?

Back (Answer)

solution goes colourless

#23

Front (Question)

What happens when you add dilute NH3 to a positive result of Br^- ions?

Back (Answer)

no reaction (cream precipitate remains)

#24

Front (Question)

What happens when you add conc. NH3 to a positive result of Br^- ions?

Back (Answer)

solution goes colourless