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Determination of CaCO3 in toothpaste
Transcript of Determination of CaCO3 in toothpaste
Presented By: Benjamin Quek
Determine the percentage by mass of CaCO3 in toothpaste
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
10ml of deionised water was added to wash the toothpaste off the side of conical flask
Two drops of methyl orange indicator added to the mixture upon cooling to room temperature
Excess HCl in the conical flask was back titrated with 0.08M standard NaOH solution
Judgement error on colour change
Setup error (Evaporation)
Main Component of
Uses of CaCO3
Types of toothpaste
Promotes oral health
Removes dental plague and food remnants on teeth
Made out of
Who Discovered CaCO3?
The flask was gently heated over a hot plate for 5 minutes with a funnel in the mouth of the flask
CaCO3 is used as an abrasive in toothpaste
Toothpaste sample contains 20.3% CaCO3
(Literature value of 20%)
Add glass marbles into the funnel during the boiling phase.
Add white paper under the conical flask during titration
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
Depends on the time, and pressure applied while brushing
Effects of excessive abrasive in toothpaste