1. Aim of the experiment -- to separate a mixture of coloured salt and water
Answers
Answer:
If you have a mixture of salt and sand, then by placing the mixture in water you will find that the salt dissolves but the sand remains. If this new mixture is then filtered, the salt in the salty water solution passes through the filter paper to form the filtrate and the sand remains as the residue.
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Answer:
If desired, the experiment can be extended to isolate dry samples of sand and salt. To do this, the damp sand in the filter paper can be transferred to another sheet of dry filter paper, and, by folding and dabbing, the sample can be dried. If necessary, another piece of filter paper can be used.
Students often like to present their specimens in small bottles for approval, so a spatula could be used to accomplish this. While the first student of a pair is transferring the sand, the other can be scraping the dried salt from the evaporating dish and transferring it to another specimen bottle.
If this extension is carried out, the students should be encouraged to label the bottles. They should be told that all samples prepared in this way need to be labelled, even if in this case, it should be obvious which substance is which.