Laboratory Safety Rules Need To Follow ( Part 2 )

22. If you or your lab partner is hurt, immediately (and loudly) yell out the teacher's name to get the teacher's attention. Do not panic.

23. If a chemical should splash in your eye(s) or on your skin, immediately flush with running water for at least 20 minutes. Immediately (and loudly) yell out the teacher's name to get the teacher's attention.

24. All chemicals in the laboratory are to be considered dangerous. Avoid handling chemicals with fingers. Always use a tweezer. When making an observation, keep at least 1 foot away from the specimen. Do not taste, or smell any chemicals.

25. Check the label on all chemical bottles twice before removing any of the contents. Take only as much chemical as you need.

26. Never return unused chemicals to their original container.

27. Never remove chemicals or other materials from the laboratory area.

28. Never handle broken glass with your bare hands. Use a brush and dustpan to clean up broken glass. Place broken glass in the designated glass disposal container.

29. Examine glassware before each use. Never use chipped, cracked, or dirty glassware.

30. If you do not understand how to use a piece of equipment, ASK THE TEACHER FOR HELP!

31. Do not immerse hot glassware in cold water. The glassware may shatter

32. Do not operate a hot plate by yourself. Take care that hair, clothing, and hands are a safe distance from the hot plate at all times. Use of hot plate is only allowed in the presence of the teacher.

33. Never look into a container that is being heated.

34. Do not place hot apparatus directly on the laboratory desk. Always use an insulated pad. Allow plenty of time for hot apparatus to cool before touching it.

35. Heated glassware remain very hot for a long time. They should be set aside in a designated place to cool, and picked up with caution. Use tongs or heat protective gloves if necessary.

Comments

Young’s Modulus ‘Y’ By Searle’s Method

Aim: To determine Young’s modulus of elasticity of the material of a given wire by Searle’s method. Procedure: i. Arrange the experimental set up as shown in diagram. Attach a zero load (slotted hanger it self) and dead load (E) to the frames of the experimental wire and dummy wire respectively so that the wires become free of kinks and remain vertically straight. ii. With the help of micrometer screw gauge, find the correct diameter of the wire at three different places. At every place two readings of the micrometer are taken while holding it in one position and another perpendicular to it by rotating through 90°. iii. In all, six readings of the diameter of the wire are taken. Hence mean diameter and radius of the wire is found out. iv. Adjust the spirit level so that the air bubble is at the centre. Note down the reading of the micrometer screw (M) attached to it. This is zero reading. (This contains main scale reading ...

Qualitative analysis test

To detect one cation and one anion from the following: (Insoluble salts to be excluded) Apparatus: Micro test-tubes with stand, test tube holder, kerosene burner, W-tube, well plate, dispensing bottles, china dish, cotton swabs, charcoal cavity, W. Tube etc. Chemicals: 6MH2 SO4, 6MHCl, lime water, sodium carbonate, sodium metal, BaCl2 solution, KMnO4 solution, KI solution, starch solution, acetic acid Introduction: The inorganic qualitative analysis involves the identification of ions present in a sample. The salt consists of anion and cation. The basis of identification is the observed chemical behaviour of the components. The salt analysis may be systematically carried out in the following three steps: i) Preliminary examination ii) Detection of anions and iii) Detection of cations Preliminary examination: First we proceed to examine the physical properties of the salt. This is followed b...

Spectrometer I - Refractive index of the prism.

PROCEDURE: I. To determine the angle of the prism 1. The preliminary adjustments for telescope, prism and the collimator are done. 2. The slit is illuminated by a sodium vapour lamp. The prism table is mounted vertically. 3. The refracting edge of the prism placed facing the collimator. 4. The image on one side is seen through through the telescope and the vernier readings (R1) are noted. 5. The image on other side is seen through through the telescope and the vernier readings (R2) are noted. 6. 2A = R1  R2  hence the angle of the prism ‘A’ is determined using A =  II. To determine the angle of minimum deviation 1. The edge of the prism is placed facing away from the collimator. 2. The refracting image is obtained in the telescope. The prism table is slowly rotated. 3. The image moves, then stops and turns back. The position of the image where the image stops and turns back is the minimum deviation. 4. The vernier readings (R3) are noted at this position and the direct ray reading...

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