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CHEMICAL LABORATORY
A laboratory is a building or a room used for scientific experiments, research, testing and the preparation, on a small scale, of drugs, chemicals or other products or substances. The chemical laboratory may be used for teaching purposes, for routine analysis, testing and control, for fundamental (pure) research or applied research, or as an adjunct to development or production for industry. There are also specialist types of laboratories, for example those for nuclear research.
The typical chemical laboratory usually consists of a large room with a weighing (balance) room, a reagent room and sometimes a darkroom.
The balance room is specially constructed to be free from external disturbances. The balances stand on firm stone shelves. The analytical balance is kept in a glass case. It is the basic tool in all quantitative analysis and is used for the accurate weighing of samples and precipitates. The material to be weighed is transported to and from the balance room in a filled dissicator. The reagent room is used for storing chemicals and apparatus. Chemicals are stored on shelves in labelled bottles and other containers.
The laboratory itself is fitted with benches, sinks, fume cupboards or hoods, electric drying chambers and steam ovens. Distilled water is usually stored in glass tanks or containers. The laboratory usually has facilities for glass blowing. Heating is generally done directly by the Bunsen burner. Test-tubes are held above the flame in wooden holders or tongs. Solutions are heated in beakers and flasks on wire gauzes or asbestos boards, supported by tripods. Solids are heated in crucibles supported by triangles. Crucibles have lids.
Vessels and tubes are generally closed by means of glass stoppers, rubber bungs or corks.
Materials are pulverised by a mechanical grinder or by a pestle and mortar. Liquids are stirred with a glass rod.
Filtration is carried out by allowing the liquid to percolate (strain) through a filter, such as a filter paper folded to fit a filter funnel. The filter paper is a circular sheet of paper, which has very fine pores through which liquids can pass but not solids. When a mixture is filtered, the clear liquid which comes through the filter paper is called the filtrate and what is left on the filter paper is known as the residue.
Samples of gases may be collected for experimental purposes in airtight gas containers over water or mercury by displacing air with the gas. The method of collection varies according to the solubility and density of the gas. A gas-jar is made of thick glass and has a ground glass top, which can be made "gas-tight" by placing on it a ground glass cover smeared with a thin film of petrolatum. More complex pieces of apparatus all have glass connections, although rubber tubing may also be used.
GLASSWARE
A. CONTAINERS
a) open containers: 1) test-tubes
2) beakers
3) flasks a) conical flasks
b) round-bottomed flasks
c) flat-bottomed flasks
b) closed containers -bottles: 1) reagent bottles (with glass stoppers)
2) screw-capped bottles
3) wash-bottles
B. tubing:
a) hollow: 1) tubes
a) straight tubes
b) U-shaped tubes
c) bent tubes
b) solid: rods
C. special apparatus:
a) measuring 1) graduated cylinders
2) burettes
3) pipettes
b) pouring 1) funnels
EXERCISES
A. The instructions below are in the wrong order. Reorder them in the right way and suggest a suitable heading:
HEADING: ____________________________________
Tear off the corner of the first fold.
Fit the paper into the funnel.
Fold a piece of paper along its diameter.
Pour out any excess water from the filter before using it.
Press the paper down until it fits tightly and leaves no air spaces.
Wet the paper with a few millilitres of distilled water to ensure that it stays in place.
Fold it again at slightly less than a right angle to the first fold.
Open the paper to form a cone.
B. Complete the following passage using imperative verbs from the list. Some verbs may be used more than once.
try bathe dip take wash
keep wipe up burn wash up drink
ACCIDENTS WITH LIQUIDS
Sometimes specimens are spilled in the laboratory. If this happens, quickly ________
a piece of cotton-wool, ___________ it in an antiseptic and __________ every drop carefully. ____________ the cotton-wool afterwards and ___________ your hands.
If an acid splashes into the eye, ___________ calm. ___________ it with water from a wash-bottle and ___________ it using an eyebath with a 5% solution of sodium carbonate. Then ___________ any other drops of
acid from the bench. If a strong acid or alkali is swallowed by mistake, there is a danger of poisoning. First ___________ the mouth immediately and then __________ several glasses of water. If an acid has been swallowed, also __________ some milk of Magnesia. If an alkali has been swallowed, ____________ some very weak acetic acid. In either case, do not ____________ to vomit.
EXERCISE C.
Read the following passage and then do the tasks below.
USE OF THE BUNSEN BURNER
Turn on the gas and, after a few seconds, light the burner by bringing a lighted match from the side to the top of the burner. Do not hold a lighted match over the burner when turning on the gas. Adjust the gas valve and rotate the collar over the air vents until the flame has an inner blue cone and is about 10 cm high.
To heat a liquid in a flat-bottomed flask or a beaker, place the container on a wire gauze placed on a tripod stand. Do not fill the container more than two-thirds full. Adjust the apparatus so that the tip of the inner blue cone – the hottest part of the flame – touches the wire gauze.
To heat a liquid in a test-tube, adjust the burner to give a softer flame. Fill the test-tube no more than two-thirds full and hold it in a test-tube no more than two-thirds full and hold it in a test-tube holder. Heat the liquid at a short distance from the flame and agitate the tube continuously. Also move the test-tube in and out of the flame.
Task 1 Translate the text into Croatian
Task 2 Change the instructions given in the passage into a description of how to use the Bunsen burner. Some changes will have to be made. Begin like this:
The gas is turned on and….
