10 Acids and alkalis (cont.)

d) How coulda sample of pure lithium chloridebe made?

4 Give the name of the salt formed in aneutralisation reaction involving the following pair s of acidand base.

a) Magnesium hydroxide and nitric acid b) Copper(II) oxide and sulfuric acid c) Aqueous ammonia and nitric acid d) Potassium hydroxide and hydrochloric acid e) Zinc oxide and nitric acid f) Calcium hydroxide and hydrochloric acid

10.9 Neutralisation reac tions in everydaylife

1 The following diagram shows details of anold-fashioned fire ex tinguisher.

glassbottle sodium hydrogencarbonate solution metallic container a) What neutralisation reac tiontakes place when the ex tinguisherisac tivated? b) Explain how the fire ex tinguisher work s. a) The sting of a waspis alkaline i) What type of subs tanceisneeded to neutralise the sting? ii) Sugges ta suitable subs tancebearing in mind that the substance itself shouldnotdamage the skin. b) The sting of abeeisacidic. i) What type of substance is needed to neutralise the sting?

2 Some insec ts have stings whichcausepain and irritation to theskin.