Chemistry Form 4: UPSI/SLISS 2012 Chapter 8: Salt (Part 3)

1. NURUL ASHIKIN BT. ABD RAHMAN PART 3

2. LEARNING OUTCOMES
 Design an activity to prepare a specified
salt.
 Construct ionic equations through the
continuous variation method.
 Solve problems involving calculation of
quantities of reactants or products in
stoichiometric reactions.

3. Salt
Is the salt NO Use precipitation method
soluble?
YES
It it NAK?
Na,NH4+, K
YES Acid + Alkali  salt + water
NO
React with:
• Acid + metal oxide  salt + water
• Acid + metal  salt + hydrogen gas
• Acid + metal carbonate  salt + water + carbon dioxide

4. Use Precipitation Method
• Choose soluble salt solution
containing anion and cation
insoluble salt.
• Mix the two solution.
• Filter.
• Wash.
• Dry the precipitate.

5. Acid + Alkali  salt + water
Titration method
Evaporation/Heating
Cooling/crystallization
Filtration
Dry

6. React with:
• Acid + metal oxide  salt + water
• Acid + metal  salt + hydrogen gas
• Acid + metal carbonate  salt + water + carbon dioxide
Add metallic
oxide/metal/carbonate oxide
Heating
Filtration
Recrystallisation

7. A balanced chemical equation
provide information about the
number of moles of each
reactant and the product in the
reaction.

8. EXAMPLE 1:
Calculate the number of moles of aluminium
sulphate produced by the reaction of 0.5 mol
of sulphuric acid with excess aluminium
oxide?
Ans: 0.167 mol

9. EXAMPLE 2:
5.0 g of copper (II) carbonate powder is added
to 50cm3 of 21.9 g dm-3 hydrochloric acid.
Calculate the mass of unreacted copper (II)
carbonate.
[RAM: H, 1 ; C, 12; Cl, 35.5 ; Cu,64]
Ans: 3.14 g CuCO3

10. EXAMPLE 3:
4.05 g of aluminium oxide powder is mixed
with excess dilute nitric acid and the mixture
is heated. Calculate the mass of aluminium
nitrate produced.
[RAM: N,14; O,16; Al, 27]
Ans: 17.04 g

11. EXAMPLE 4:
150 cm3 of 1.0 mol dm-3 ammonia solution is
completely neutralised with phosphoric acid
using a titration methode. Calculate the mass
of ammonium phosphate formed.
[RAM: H,1 ; N,14; O,16; P,31]
Ans: 7.45 g

12. EXAMPLE 5:
What is the volume of 2.0 mol dm-3
hydrochloric acid required to dissolved 10 g of
marble ( calcium carbonate)?
[RAM: H,1 ; O,16; C,12; Ca,40]
Ans: 100 cm3