CHAPTER 8SALT

NURUL ASHIKIN BT. ABD RAHMAN PART 3

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.

PREPARATION SPECIFIED SALTSalt

Is the salt soluble?

It it NAK?Na,NH4+, K

React with:• Acid + metal oxide salt + water• Acid + metal salt + hydrogen gas• Acid + metal carbonate salt + water + carbon dioxide

NO

YES

YES

NO

Use precipitation method

Acid + Alkali salt + water

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

Use Precipitation Method

Acid + Alkali salt + water

Titration method

Evaporation/Heating

Cooling/crystallization

Filtration

Dry

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

STOICHIOMETRIC REACTION(Balance Chemical Equation)

A balanced chemical equation provide information about the

number of moles of each reactant and the product in the

reaction.

Calculate the number of moles of aluminium sulphate produced by the reaction of 0.5 mol of sulphuric acid with excess aluminium oxide?

EXAMPLE 1:

Ans: 0.167 mol

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]

EXAMPLE 2:

Ans: 3.14 g CuCO3

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]

EXAMPLE 3:

Ans: 17.04 g

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]

EXAMPLE 4:

Ans: 7.45 g

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]

EXAMPLE 5:

Ans: 100 cm3

End of slide… Thank you..

UPSI 2012