Friday, 31 March 2017

Hard water

Today, we're going to test the hardness of water.
We need some reagents:



We carry out dosage experiment:
 
 eriochrome turned from pink to blue:



 
 
With tap water, we need 1 mL of EDTA
With Hepar water, we need 19 mL of EDTA.
With sea water, we need 75 mL of EDTA

So:
sea water is very very hard!
tap water is not that hard.

Hugo, Mathéo 1STL

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