Titration of 100 ml of 0.1 M Na2CO3(ka1 of H2CO3=10-7 and ka2 of H2CO3=10-11) solution with 0.1 M HCl solution. Which of the following is suitable indicator?

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Titration of 100 ml of 0.1 M ${Na}_{2} {CO}_{3} ({ka}_{1} {of H}_{2} {CO}_{3} {=10}^{-7} {and ka}_{2} {of H}_{2} {CO}_{3} {=10}^{-11})$ solution with 0.1 M HCl solution. Which of the following is suitable indicator?

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Methyl orange for 2^nd equivalence point

Phenolphthalein for 2^nd equivalence point

Phenolphthalein for 1^st equivalence point

Methyl orange for 1^st equivalence point

answer is A, B.

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Detailed Solution

$N a_{2} C O_{3} + H C l \to \underset{p H o f s o l i n r a n g e o f p h e n o l p t h a l i n e}{\underset{⏟}{N a H C O_{3} + N a C l}} N a H C O_{3} + H C l \to N a C l + H_{2} C O_{3}$