Elements of Life - Ion Tests

Question 1

What are the precipitate tests for halides?

Answer 1

Add silver nitrate:

• > chloride -> white
• > bromide -> cream
• > iodide -> pale yellow

Question 2

What is the precipitate test for sulphates?

Answer 2

Add barium chloride

White ppt formed

Question 3

What are the precipitate tests for copper and iron?

Answer 3

Add sodium hydroxide:

copper -> blue

iron (II) -> dirty green

iron (III) -> orange / brown

Question 4

What is the flame test for Lithium?

Answer 4

Crimson

Question 5

What is the flame test for sodium?

Answer 5

orange

Question 6

What is the flame test for potassium?

Answer 6

lilac

Question 7

What is the flame test for barium?

Answer 7

pale green

Question 8

What is the flame test for calcium?

Answer 8

red

Question 9

What is the flame test for copper?

Answer 9

blue-green

Question 10

What is the formula for % error?

Answer 10

error / reading

x100

Question 11

Name a lead salt, soluble in water?

Answer 11

Lead Nitrate

Question 12

Describe the process of producing Silver Nitrate using silver carbonate and nitric acid

Answer 12

Mix silver carbonate with excess nitric acid

Crystallize

Question 13

Name 2 observations of reacting an alkali metal with water

Answer 13

Fizzing / bubbling as hydrogen gas is given off

Metal dissolves / reacts away

Question 14

Sodamine (NaNH₂) is made by reacting Na and NH₃

It reacts with water to form NaOH and NH₃

Suggest why this reaction makes sodamine a good drying agent

Answer 14

NH₃ is the only gas formed

It absorbs water during the reaction