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Determination of CaCO3 in toothpaste

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by

Benjamin Quek

on 11 August 2013

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Transcript of Determination of CaCO3 in toothpaste

Determination of CaCO3 in Toothpaste
Presented By: Benjamin Quek
Timothy Teo

Objective
Determine the percentage by mass of CaCO3 in toothpaste
Background Info
CaCO3
Back Titration
Toothpaste

Contents
Objective
Background Information
Procedure
Results
Errors
Recommendations
Discussion
Conclusion
Back Titration
Step 1
Glass rod used to place 0.1 - 0.2g of toothpaste in a conical flask
10ml of 0.16M standard of HCl was pipetted into the conical flask
Step 2
10ml of deionised water was added to wash the toothpaste off the side of conical flask
Step 3
Two drops of methyl orange indicator added to the mixture upon cooling to room temperature
Step 5
Excess HCl in the conical flask was back titrated with 0.08M standard NaOH solution
Step 6
Results
Errors
Judgement error on colour change
Parallax error
Setup error (Evaporation)
CaCO3
Main Component of
Eggshell
Snail shell
Pearls
Uses of CaCO3
Antacid
Toothpaste
Obtained By
Mining
Quarrying
Toothpaste
Types of toothpaste
Paste
Gel
Promotes oral health
Removes dental plague and food remnants on teeth
Made out of
Calcium Carbonate
Fluorine
Who Discovered CaCO3?
Romans
Start
End
The flask was gently heated over a hot plate for 5 minutes with a funnel in the mouth of the flask
Step 4
Conclusion
CaCO3 is used as an abrasive in toothpaste
Toothpaste sample contains 20.3% CaCO3
(Literature value of 20%)
Recommendations
Add glass marbles into the funnel during the boiling phase.
Add white paper under the conical flask during titration
Procedure
Discussion
Accuracy and precision of results
Attempt 2 and 3, same results while result from attempt 1 was close to 2 and 3
Results obtained from all attempt and the average was close to the literature value(20%)
Enamel becomes thinner
Discoloration
Tooth sensitivity
Depends on the time, and pressure applied while brushing
Effects of excessive abrasive in toothpaste
Thank you!!
Citations
http://4.bp.blogspot.com/-XaVCIGATQ0I/T3C_M5tPUCI/AAAAAAAAAcU/gSMP4eR8x5I/s200/smiley+2+thumbs+up.gif
http://upload.wikimedia.org/wikipedia/commons/b/b8/Lower_wisdom_tooth.jpg
http://www.italianbellavita.com/wp-content/uploads/2012/10/arom.jpg
http://gfrendz.com/main/wp-content/uploads/2010/12/ta.jpg
http://www.huffingtonpost.com/suzette-standring/too-much-toothpaste-damag_b_110419.html
http://www.sro.wa.gov.au/sites/default/files/mining-collie.jpg
http://thenamestation.files.wordpress.com/2012/04/pearl-of-great-price-vibrance1.jpg
http://image.made-in-china.com/2f0j00behtuVkraLqi/Glass-Marble-Ball.jpg
http://exelmagazine.org/wp-content/uploads/2012/06/brain-webTOC.jpg
http://believingthomas.files.wordpress.com/2007/04/eggshell.jpg
Silica
Full transcript