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Science & NatureBack Titration
By Jiahao
Category: Science & Nature. Viewed 877 times. Created December 2014.     Disclaimer.   
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START
 
 









 
 
10.0mL of 0.164M HCl was pipetted.
0.1-0.2g of toothpaste sample was added
 









 
 
Reaction is complete.
Heat over the hot plate for 5mins. Is CaCO3 completely dissociated?
 









 
 
Back titrate HCl against NaOH.
Continue heating till CaCO3 completely dissociated.
 









 
 
Colour change. Is colour change pink to orange?
Overshot end point.
 









 
 
End point is reached.