Guest Posted March 25, 2009 Share Posted March 25, 2009 Hello. Strange question I know but does anyone know of a liquid I can mix with oil and water. We have shown the children that oil and water can't mix and have them in a bottle which the children can shake to mix and then watch them seperate. We were wondering if there was a third liquid we could add to show different levels of density. Would adding alot of salt to the water change the density. I'm assuming it would but will it then mix with the water thats already in there. This disscussion has come out of some marbling we were doing today which the children loved. Thanks for yor help. Jodes Link to comment Share on other sites More sharing options...
Cait Posted March 25, 2009 Share Posted March 25, 2009 (edited) If you put washing up liquid in you'll create an emulsion as the detergent allows the oil and water to mix Oh - and congratulations on your first post - and welcome to the forum! Edited March 25, 2009 by Cait Link to comment Share on other sites More sharing options...
Rea Posted March 25, 2009 Share Posted March 25, 2009 Drops of food colouring will sink through the oil and then disperse into the water. The bigger the container the better. Welcome to the forum Link to comment Share on other sites More sharing options...
Inge Posted March 26, 2009 Share Posted March 26, 2009 if you do the food colour thing try baby oil as it is clear and you see it move better. We sealed our bottle , used blue colour and when you move it it looks like the sea moving, fascinating to watch . Inge Link to comment Share on other sites More sharing options...
Guest Posted March 27, 2009 Share Posted March 27, 2009 (edited) http://scifun.chem.wisc.edu/HomeExpts/layeredliquids.htm here is an idea, looks interesting... http://www.metacafe.com/watch/352148/layered_liquids/ -a video to demonstrate. Edited March 27, 2009 by Guest Link to comment Share on other sites More sharing options...
Guest Posted March 27, 2009 Share Posted March 27, 2009 How about Golden Syrup as the third layer? Lots to talk about as it trickles in. Link to comment Share on other sites More sharing options...
Guest Posted March 27, 2009 Share Posted March 27, 2009 Thanks for all your great ideas. Am getting exited about making the rainbow in a glass this week now!! Jodes Link to comment Share on other sites More sharing options...
Guest Posted April 19, 2009 Share Posted April 19, 2009 Yep, syrup works. Then I left it out for the children all week with loads of empty bottles and an array of media for them to experiment with. They were fascinated by it all. We even went down the 'reversible' and 'irreversible' change route, and trying to get glitter back out of the water and guessing whether we'd be able to get the sugar 'back out' again etc... really great activity. Link to comment Share on other sites More sharing options...
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