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  3. Chemistry
  4. In the titration of Na2CO3 and HCl, the indicator used is

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Q. In the titration of $ N{{a}_{2}}C{{O}_{3}} $ and $ HCl, $ the indicator used is

WBJEEWBJEE 2007

Solution:

$p H$ of the solution at the equivalence point is on the acidic side due to dissolution of $CO _{2}$ formed. A slight excess of strong acid lowers the $p H$ to $3.5$ when methyl orange produces red colour.