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Chemistry ( 13 Chemical Tests ) > Flame Tests & Metal Hydroxides > Flashcards

Flashcards in Flame Tests & Metal Hydroxides Deck (14)
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1

what does the flame test identify

the flame test identifies metal ions

2

what colour is the flame when burning Calcium ( CA2+ )

Orange/red flame

3

what colour is the flame when burning sodium ( NA+ )

Yellow Flame

4

what colour is the flame when burning Copper ( CU2+ )

Blue/Green flame

5

what colour is the flame when burning Lilac ( K+ )

Lilac Flame

6

what colour is the flame when burning Lithium ( Li+ )

Crimson flame

7

Describe the flame test practical in 4 steps

1) Clean a nichrome wire loop by dipping it completely in a dilute hydrochloric acid

2) Dip the wire into the sample to be tested

3) Hold the wire loop in the blue flame of a bunsen

4) record the colour of the bunsen flame

8

what does copper ions ( CU2+ ) form when reacted with the sodium hydroxide solution and what's the equation

copper ions form the blue percipitate copper (II) hydroxide

Equation: Cu2+(aq) + 2OH-(aq) → Cu(OH)2(s)

9

what does iron (III) ions ( Fe3+ ) form when reacted with the sodium hydroxide solution and what's the equation

Iron ions form the brown precipitate iron (III) hydroxide

Equation: Fe3+(aq) + 3OH-(aq) → Fe(OH)3(s)

10

what does iron (II) ions ( Fe2+ ) form when reacted with the sodium hydroxide solution and what's the equation

iron ions form the green precipitate iron (II) hydroxide

Equation: Fe2+(aq) + 20H-(aq) → Fe(OH)2(s)

11

what do ammonium ions ( NH4+ ) form when reacted with the sodium hydroxide solution and what's the equation

the ammonium ions form water and ammonia. ammonia gas evolves out of the solution

Equation: NH4+(aq) + OH-(aq) → NH3(g) + H2O(l)

12

iron(II) ions + hydroxide ions make what?

Iron(II) hydroxide

13

What are the correct colours for the following precipitates

1) Iron (III) Hydroxide
2) Copper (II) Hydroxide
3) Iron (II) Hydroxide

Iron (III) Hydroxide = Brown
Copper (II) Hydroxide = Blue
Iron (II) Hydroxide = Green

14

In flame tests, what piece of apparatus is used to transfer the sample to the Bunsen flame?

Nichrome wire loop