Calculate the percentage of NaOH and Na2CO3 in the sample

Posted on 2014-01-20 16:50:00 in Chemistry by MARCUS HILLY

A commercial sample of caustic soda(NaOH) contains sodium carbonate as impurity. 20ml of its aqueous solution required 18ml of N/10 HCI for neutralisation using methyl orange as indicator. However, using phenolphthalein as indicator, 20ml of its solution required 12ml of N/10 HCI for end point to reach. Calculate the percentage of NaOH and Na₂CO₃ in the sample.

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