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Bath Bombs

by Lindsay Law (follow)
5 to 10s (605)      Over 10s (380)      Medium (240)      Messy Play (109)      Chemistry (1)     
This is a great activity to introduce school age child to chemistry. As an added bonus they can then explore the results in a fun way in the bath.

Time: 15 minutes, plus at least 2 hours drying time.
Age: 5-10's, Over 10's
Level: Medium



Table, bubble wrap, covered




Table, bubble wrap, covered


Materials
2 teaspoons sodium bicarbonate
1 teaspoon cornstarch
1 teaspoon citric acid
20 drops of glycerine
3 or 4 drops of vanilla fragrance
3 or 4 drops of colouring
2 teaspoons
1 mixing beaker
1 round mould (you can buy plastic moulds in craft shops)
1 mixing stick
1 packing stick

Method
Find a clear workspace near a sink, and cover the area with newspaper or plastic.



Table, bubble wrap, covered


Check your beaker is dry - this is a very important step.



Bicarbonate of soda, blue spoon, bath bomb


Add the sodium bicarbonate, cornstarch, and citric acid to the beaker. Use a separate spoon for the citric acid.



Bicarbonate of soda, blue spoon, bath bomb




Bicarbonate of soda, blue spoon, bath bomb


Add 3 or 4 drops of fragrance.



Bath bomb, dye, colouring, beaker


Add 3 or 4 drops of colour.



Bath bomb, dye, colouring, beaker


Add 20 drops of glycerine.



Bicarbonate of soda, blue spoon, bath bomb


Mix everything together evenly with your stirring stick. At this stage the mixture might fizz a bit. That's perfectly okay.



Bath bomb, dye, colouring, beaker


Once mixed, check the consistency. It should stay together in a clump when you pinch some together between your fingers, or you can scoop a little on a spoon. If it's not sticking, then add a little bit more starch and glycerine, then mix again.
IMPORTANT: Make sure your mould is dry. Pack the mixture into the mould using the bicarbonate spoon a little at a time. Between spoonfuls, pack firmly with the mixing stick.



Bath bomb, beaker, mixing


Leave to dry overnight, and then gently ease apart.



Bath bomb, beaker, mixing


Throw in the bath and experience the fizzing fun.



Bath bomb, blue


Categories
#Chemistry
#Messy Play
#Medium
#5 to 10s
#Over 10s
#Science
#Gift
#Mothers Day
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[ Submit a Comment ]
It was really good - the girls enjoyed it a lot. The results - lurid blue - not so pleasant on the eye, but that was there choice of colour mix!
This looks like fun. I think I'd like to do it myself!
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