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Are these clear liquids safe to drink flow chart, Are these Unknown…
Are these clear liquids safe to drink flow chart
Are these Unknown liquids safe to drink
water solubility test
Material
3x test tubes
100 mL distilled water
unknown solution
3x pipette
food colouring
Procedure
Fill the half of the test tube with distilled
Add 5 drops of the unknown liquid
Shake and observe
the liquid does not mix, float at the top
Can be Alkyne, alkene, alkane
All the alkyne, alkene and alkane
are unsafe to drink
Can be oil?
The solution is clean, so probably not oil
The liquid is mixed
soluble in water
Can be carboxylic acid,
proceed carboxylic acid test
Material
1x test tube
Sodium powder
The unknown solution
Procedure
add to the test tube about 5 drops of the a unknown liquid.
Add in a few sodium carbonate powder
Gently shake
Observe
Does not dissolve
1 more item...
Dissolve and fizzes
1 more item...
Can be alcohol: Proceed alcohol test
Material
1x kettle
1x 350 mL beaker
Sodium dichromate (IV) solution
Sulphuric acid
Thong
Test tube
1x pipette
The unknown solution
Procedure
Boil the water in the kettle, then pour them into a beaker
Use the thong to hold the test tube and use the dip into the boil water beaker
Add 7 drops of sodium dichromate(VI) solution to a test tube
add 7 drops of dilute sulfuric acid
add 5 drops of the unknown liquid
gently shake
Observe
The liquid changes from brown to green
1 more item...
Other colours or does not change
2 more items...
mix 10 mL of water with a drop of food colouring
Observe
Observe
Shake and observe