Activity =take 3 glass, fill each of them with equal amount of water and a few drops of ink /detol /milk to the first glass add a few drops of honey /sugar syrup /to the second glass add some sugar, salt to the third glass and note the time taken by these solutions to dissolve completely. Write aim, material required, procedure, observation, precautions, results.
Answers
Answer:
The aim: to determine solubility of various substances (solids and liquids ) in water.
Water is a universal solvent ,however it is polar and therefore cannot dissolve non-polar liquids like mineral oil.
The materials required are:
Water
measuring cylinder
Straw
masking tape and a pen for labelling
ink paper
The procedure
1. label clearly all the three glasses as A, B ,C
2. Use a measuring cylinder to pour equal amounts of water into the three glasses
3.While keenly looking at glass labelled A ,add 2-3 drops of ink into it and observe color change
4.Do not stir instead watch to see if the ink color disappears.Proceed to record your observations before moving to glass B.
5.Repeat the procedure above for the remaining glasses B and C
Observation
Sugar is stirred up to dissolve in water
Ink is a composition of dyes of different colours.When an ink paper is dropped in certain solvents the colours can be separated by the fact that the ink will spread out on the paper.
Some inks are found out to be water soluble
Precautions
1. Avoid using plastic containers because some liquids react with plastic
2.Read all the precautionary measures on the label
3.Ensure the liquids are subjected to same temperature for a better result
4.Exercise lab safety ,some liquids are flammable