F2 IS 2nd Term WS06 10.2 Answers

10.2    Acids and alkalis in the laboratory

i      Words to know:

	English term	Write the words again	Chinese term
1	Sulphuric acid		硫酸
2	Nitric acid		硝酸
3	Calcium hydroxide		氫氧化鈣
4	Ammonia solution		氨溶液
5	Irritant		刺激性的
6	Corrosive		腐蝕性的
7	Safety precautions		安全措施
8	Emergency treatments		危急處理

i      Fill in the blanks:

1             Acids and alkalis are commonly used chemicals in the laboratory. Below are some common examples:

Common acids in the laboratory	Common alkalis in the laboratory
l   Hydrochloric acid l   Sulphuric / Nitric acid l   Nitric / Sulphuric acid	l   Sodium hydroxide solution l   potassium hydroxide solution l   Calcium hydroxide solution l   Ammonia solution

2             Many acids and alkalis are either corrosive or irritant. Below are their hazard warning labels:

Irritant	Corroisve

3             We should follow the safety precautions below when handling acids and alkalis in the laboratory.

1.       Wear safety goggles and gloves. 2.       DO NOT use too much acids or alkalis at a time. 3.       DO NOT pour chemical waste containing acids or alkalis into the sink. Pour it into the waste bottle.

4        Emergency treatments for spillage of acids and alkalis on skin or into eyes:

l   Wash the affected area under slow running water for at least 10 minutes.

l   Wash the affected eye:

n   using an eye-wash bottle,

n   under slow running water, or

with a bottle of distilled water.