Question

a solution contain Na2CO3 and NaHCO3 .10ml of the solution required 2.5ml of 0.1 M H2SO4 for neutralisation using phenolphthalein as indector. methyl orange is added when a further 2.5ml of 0.2 M H2SO4 was required. calculate the amount of Na2CO3 in one litre of the solution.

Answer 1

Answer:

According to the problem it requires 2.5 ml of 0.1 M H2SO4 for neutralization using phenolphthalein as indicator.  

0.0025 Litres of 0.1 mol / LItre H2SO4 = 0.00025 mol H2SO4  

by the reaction:  

1 H2SO4 & 2 (CO3)-2 --> 2 (HCO3)-1 & 1 (SO4)-2  

0.00025 mol H2SO4 reacts with twice as many moles of Na2CO3 = 0.00050 mol Na2CO3  

using molar mass, find grams  

( 0.00050 mol Na2CO3) (105.99 grams / mol Na2CO3) = 0.053 grams in the 10 ml sample  

The amount of Na2CO3 in 1 liter of solution is  

5.3 grams Na2CO3

Answer 2

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