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Question

A mixture of NaOH and Na2CO3 required 25mL of 0.21 m HCl using phenolphthalein as the indicator. However, the same amount of the mixture required 30 mL of 0.1 M HCl when methyl orange was used as the indicator. The molar ratio of NaOH and Na2CO3 in the mixture was :

A
2 : 1
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B
1 : 2
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C
4 ; 1
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D
1 : 4
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Solution

The correct option is C 2 : 1
x moles of NaOH
y moles of Na2CO3
with hph, x+y moles reacted
0.21 molar molarity conversion
density data missing!

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