Science experiments

Salt Solution Experiment

You will need

2 teaspoons of salt
small bowl
cling film
warm water
teaspoon

Method

Dissolve the 2 teaspoons of salt in a small bowl of warm water.
Taste a tiny bit to confirm that it is salty.
Cover the bowl with the cling film and set it aside in a warm place for an hour or longer.
After an hour you should see tiny drops of water on the plastic cover.
Remove the cling film carefully and taste the water on the plastic.

Result

The water drops that accumulated on the plastic are not salty as the salt dissolved in the water in the bowl does not evaporate, but remains behind in the bowl.

20161118_100926
Variation

Set the bowl aside without the cover for a few days until all the water has evaporated.
Show the children the salt that remains in the bowl. In our picture you can clearly see the salt on the black sugar paper.  We now know that the separation of a dissolved substances from a liquid by means of evaporation is known as crystallisation.

 

Revision of the water cycle – precipitation – using shaving foam and food dye. 

20161118_100138 20161118_100246 20161118_100450 20161118_100459  20161118_101021 20161118_101031 20161118_101436



One Response to “Science experiments”

  1. That was one of my favourite experiments!

    Reply

Leave a Reply

Copyright © Mrs Webb's Class     Provided by PrimaryBlogger    Designed by WPDesigner    Hosted by PrimaryBlogger