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July 28, 2015

Homework Help: Chemistry -help

Posted by anne on Saturday, September 18, 2010 at 10:44pm.

To determine the sodium carbonate content & total alkali in NaOH, the following steps were performed:-
1) 2.0g of NaOH was dissolved in 80ml of CO2 free water.
2) 3 drops of phenolphthalein indicator were added and the solution was titrated with 1M HCl. Colour changed from pink to colourless.(V1 ml of HCl used)
3) 3 drops of methyl orange indicator were then added and the titration with 1M HCl was continued. Colour changed from yellow to red.(V2 ml of HCl used)
Calculations:
(%w/w)Na2CO3
= (V2 x 10.6 x 1M) / 2.0g
(%w/w)Total alkali
= ((V1+V2)x 4.0 x 1M) / 2.0g

Please explain how the calculation steps are derived?
Thanks.

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