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Lecture 6

CHEM 235 Lecture Notes - Lecture 6: Sodium Bicarbonate, Litmus, Graduated Cylinder


Department
Chemistry
Course Code
CHEM 235
Professor
Dana Zendrowski
Lecture
6

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EQUIPMENT:
spatula glass filtering funnel
50 mL beaker filter paper
250 mL separatory funnel litmus paper
10 mL graduated cylinder 2 - 125 mL Erlenmeyer flasks + corks
25 mL graduated cylinder dropper
2 - 100 mL beaker 100 mL RB flask
2 - 50 mL Erlenmeyer flasks + corks 50 mL RB flask
all small & medium test tubes watchglass
CHEMICAL HAZARDS AND WASTE DISPOSAL
Solvents to be tested: Diethyl ether, Water, 10% HCl, 10% NaOH, 5% NaHCO3
Diethyl ether
- Put in “liquid organic waste” container
- HIGHLY FLAMMABLE. Keep away from open heat sources. May form explosive
peroxides. Harmful vapour.
HCl
- Causes burns. Corrosive. Avoid breathing vapour. Prevent contact with eyes and skin
- Dilute with plenty of water and wash down sink
NaOH
- VERY CORROSIVE TO SKIN. Causes severe burns.
- Dilute with plenty of water and wash down sink
Sodium bicarbonate
- Use cautiously
- Wash down sink with plenty of water
Sodium sulfate (drying agent)
- Use cautiously
- Put in “solid waste” container
PROCEDURE:
Solubility Tests of Mixture
1. Add a few finely grounded crystals of unknown solid mixture to a small test tube
containing 2-3 mL of solvent being tested
2. Look for the Schlieren lines in solution just below solid material
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