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  4. 10.0 ml of Na 2 CO 3 solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings. 4.8 ml , 4.9 ml , 5.0 ml , 5.0 l and 5.0 ml Based on these readings, and convention of titrimetric estimation of concentration of Na 2 CO 3 solution is. mM (Round off to the Nearest integer)

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Q. $10.0\,ml$ of $Na _{2} CO _{3}$ solution is titrated against $0.2\, M\, HCl$ solution. The following titre values were obtained in $5$ readings. $4.8\,ml , 4.9\,ml , 5.0\,ml , 5.0\,l$ and $5.0\,ml$ Based on these readings, and convention of titrimetric estimation of concentration of $Na _{2} CO _{3}$ solution is_______. $mM$
(Round off to the Nearest integer)

JEE MainJEE Main 2021Some Basic Concepts of Chemistry

Solution:

Most precise volume of $HCl =5\,ml$

at equivalence point

Meq. of $Na _{2} CO _{3}=$ meq. of $HCl$.

Let molarity of $Na 2 CO _{3}$

solution $= M$, then

$M \times 10 \times 2=0.2 \times 5 \times 1$

$M =0.05\,mol / L$

$=0.05\,\times 1000$

$=50\,mM$