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TESTING FOR CATIONS

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Total cards: 10•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (10)

#1
Front (Question)

What do you observe when you add dilute sodium hydroxide to to iron (II) ions?

Back (Answer)

You observe the formation of a dirty green solid.

#2
Front (Question)

What do you observe when you add dilute sodium hydroxide to iron (III) ions? (Fe3+)

Back (Answer)

The formation of an orange/brown precipitate (rust)

#3
Front (Question)

What do you observe when you add dilute sodium hydroxide to ammonium ions? (NH4+)

Back (Answer)

A pungent smell and it turns damp red litmus paper blue.

#4
Front (Question)

What do you observe when you add dilute sodium hydroxide to copper (II) ions? (Cu2+)

Back (Answer)

The formation of a pale blue solid

#5
Front (Question)

How do you carry out a flame test?

Back (Answer)

Use a nichrome wire with a loop at the end, which has been cleaned with dilute HCL. Then hold it over a Bunsen burner.

#6
Front (Question)

What colour is the flame that lithium burns with? (Li+)

Back (Answer)

A red flame

#7
Front (Question)

What colour is the flame that sodium burns with? (Na+)

Back (Answer)

A yellow orange flame

#8
Front (Question)

What metal ion burns with a lilac flame?

Back (Answer)

Potassium (K+)

#9
Front (Question)

What metal ion burns with a brick red flame?

Back (Answer)

Calcium (Ca2+)

#10
Front (Question)

What two ways can be used to test for cations?

Back (Answer)

Either do the flame test, or use NaOH(aq)