Today we  got into groups to decide on our focus for our own dissolving investigations.  We spoke about making it a fair test, ensuring that we only change one thing so that we can see if that change had an impact.

One thing that every group chose to keep the same in their investigation was to use the same amount of water in each jar.   We had to make sure we measured it very carefully.

Some groups were keen to  find out what would happen if we mixed soluble substances and insoluble substances together in the water.  Most found that the flour just made the water cloudy so it was difficult to see if the salt or sugar dissolved.

Others wanted to find out if the water temperature would have an affect on the speed at which the substance dissolved.  One group tried to dissolve sugar in cold, warm and hot water.

I wonder if you can guess which jar contained the hot water…?

A couple of groups were keen to see if they could separate sugar and salt from the water once it had dissolved and how long this would take.   We won’t know the results of these investigations yet, but will keep you posted!

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