C2.6- making salts

Question 1

How can you tell when a neutralisation reaction has finished?

Answer 1

The indicator turned green/ the meter showed a 7

Question 2

What is the ionic equation to show what happens during a neutralisation reaction

Answer 2

H+(aq) + OH-(aq) –> H2O(l)

Question 3

Describe a method to produce a sample of sodium chloride (soluble) from:
Sodium hydroxide (solution)
Hydrochloric acid (solution)

Answer 3

1) 5cm^3 alkali
2) add indicator
3) acid until neutral
4) repeat without indicator
5) evaporate

Question 4

What ion is present in an acidic solution? Eg. HCl

Answer 4

H+

Question 5

What ion is present in an alkaline solution? Eg. NaOH

Answer 5

OH-

Question 6

Describe a method to produce a sample of copper sulfate (soluble) from:
Copper oxide(solid)
Sulfuric acid(solution)

Answer 6

1) add excess copper oxide base to the acid
2) heat reaction- to speed up reaction
3) filter the excess copper oxide
4) evaporate the water

Question 7

What reaction occurs when ammonia is added in water?

Answer 7

NH3 + H2O –> NH4OH

Ammonia + water -> ammonium hydroxide

Question 8

What is the formula of ammonium sulfate?

Answer 8

(NH4)2SO4

Question 9

Explain why ammonium salts are used in fertilisers

Answer 9

They contain nitrogen which plants use as a nutrient for growth. They are soluble and easily absorbed through the roots.

Question 10

Describe a method to produce a sample of lead iodide (insoluble) from:
Lead nitrate
Sodium iodide

Answer 10

1) react together
2) filter the solid
3) wash and dry

Question 11

What does the ph scale show?

Answer 11

if it is an acid or an alkali and how strong it is.