Question

At the end point in acid-base titrations of a basic substance with acid using phenolphthalein pink-violet colour of the solution disappears, while using Methyl orange, a red colour appears.
During the titration of a mixture of Na2CO3 and NaHCO3 with HCl using phenolphthalein and methyl orange indicators one after the other respectively:-
a)disappearance of pink-violet colour corresponds to the neutralization of NaHCO3
b)disappearance of pink-violet colour corresponds to the conversion of Na2CO3 to NaHCO3
c)appearance of red colour corresponds only to the complete decomposition of NaHCO3 previously present
d)appearance of red colour corresponds to the decomposition of NaHCO3 formed and that previously present

Answer 1

Answer:

At the end point in acid-base titrations of a basic substance with acid using phenolphthalein pink-violet colour of the solution disappears, while using Methyl orange, a red colour appears.

During the titration of a mixture of Na2CO3 and NaHCO3 with HCl using phenolphthalein and methyl orange indicators one after the other respectively:-

a)disappearance of pink-violet colour corresponds to the neutralization of NaHCO3

b)disappearance of pink-violet colour corresponds to the conversion of Na2CO3 to NaHCO3

c)appearance of red colour corresponds only to the complete decomposition of NaHCO3 previously present

d)appearance of red colour corresponds to the decomposition of NaHCO3 formed and that previously present

Explanation:

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