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Chemical Gas tests, Salt solubility test, Testing for water, Chemical…
Chemical Gas tests
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Ammonia gas test: Ammonia is used in agriculture as fertilizer. It is also used as a refrigerant gas, to purify water, and in the manufacturing process of plastic. Ammonia is corrosive to tissue, thus it is a hazard if breathed in. Ammonia gas tests can be used to test the alkalinity of fertilizer and as a precaution if there is a gas leak.
Chlorine gas test: Chlorine is used to disinfect pools and is part of the sanitation process for sewage systems. Back in war times, chlorine was also used in warfare because it caused acid burns in lunges when inhaled. Chlorine gas tests can be used as a precaution and to make sure nothing is leaked.
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Hydrogen gas test: Back then, hydrogen gas was used in airships and airborne vehicles because it was less dense than air, making it float. Helium was not used because, at the time, it was more expensive. Hydrogen is now used to power some cars, to generate electricity and more.
Oxygen gas test: Oxygen is necessary for life. It is used in aerobic respiration which releases energy for us to carry out our daily life processes eg. moving, breathing, etc. It is also used in the welding and cutting of metals
Carbon dioxide gas test: Carbon dioxide is known to be used in fire extinguishers because it does not promote/encourage combustion. It is also used in photosynthesis in plants, which helps them make food for themselves.
Salt solubility test
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Key meanings:
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Precipitate: An insoluble solid (usually a salt) in a solution produced when two solutions are mixed.
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Insoluble salts:
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Common hydroxides (Except sodium, potassium and ammonium)
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Common carbonates (Except sodium, potassium & ammonium)
magnesium/calcium/strontium/barium/aluminium/iron/copper/zinc/lead hydroxide,
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Chemical Cation tests
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Non metal-cation test:
Ammonium cation: Instructions are the same: Add sodium hydroxide to the solution drop by drop with a pipette. But once you have done so, place the test tube in a warm water bath. Once it is placed, hang a damp red strip of litmus paper into the tube and observe what happens. If it is a positive test, heating the tube would produce ammonia gas and make the litmus paper blue.
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