Saturday, August 20, 2011

Worksheet 11: Chemical Changes of Materials pg 8

Demonstration 2   

Given 4 different solutions, how can we identify the solutions?

4 solutions : Water, Sodium Hydroxide, Hydrochloric acid, Hydrogen Peroxide(decomposes under light) 
First , use the universal indicator to identify the solutions. 
  • Red  -> hydrochloric acid 
  • Indigo  -> Sodium Hydroxide 
  • Green -> Water and Hydrogen Peroxide 
Red - Yellow : Acids 
Blue - Violet : Alkali 

Since there are two solutions that are neutral ( green in Universal Indicator) , we have to conduct another test to further identify them into which is water and which is hydrogen peroxide. 

Water and Hydrogen Peroxide ---------------> Test for oxygen with a glowing splint 

Hydrogen Peroxide -----> oxygen + water 

Relights glowing splint ------> Hydrogen Peroxide 

No relights of glowing splint ---------> Water 

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