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Flashcards in Analysing Substances Deck (13):
1

lithium burns what colour?

Crimson

2

Sodium burns what colour?

Yellow

3

Potassium burns what colour?

Lilac

4

Calcium burns what colour?

Brick red

5

Barium burns what colour?

Green

6

if you add sodium hydroxide to an unknown solution in a test for positive ions and you get a white precipitate, what would that mean if it dissolves?

it's Al3+

7

if you add sodium hydroxide to an unknown solution in a test for positive ions and you get a white precipitate, if it doesn't dissolve in excess?

if you burn it and it burns red then it's Ca2+

8

if you add sodium hydroxide to an unknown solution in a test for positive ions and you get a coloured precipitate then what colour means what ion?

brown = Fe3+
Green = Fe2+
Blue = Cu2+

9

the test for carbonates

adding dilute acids, should fizz if carbon dioxide is present.

10

test for lime water

Co2, makes a white precipitate and makes limewater cloudy.

11

test for halides?

- add dilute nitric acid
- silver nitrate solution
- precipitate is formed

12

during the test for halides, what do the different coloured precipitates mean?

- white = silver chloride
- cream = Silver bromide
- yellow = Silver iodide

13

test for sulfates consist of?

- add dilute acid
- add barium chloride solution
- white precipitate formed if sulfate ions are present