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(B) Pure water has a $pH$ of $7$ at $298 \ K$. When it absorbs $CO_2$ from the atmosphere,it reacts with water to form carbonic acid $(H_2CO_3)$. $CO_

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Less than $7$

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(B) Pure water has a $pH$ of $7$ at $298 \ K$. When it absorbs $CO_2$ from the atmosphere,it reacts with water to form carbonic acid $(H_2CO_3)$. $CO_2 + H_2O \rightleftharpoons H_2CO_3$. $H_2CO_3$ is a weak acid that dissociates to release $H^+$ ions: $H_2CO_3 \rightleftharpoons H^+ + HCO_3^-$. The increase in $H^+$ ion concentration causes the $pH$ of the solution to decrease below $7$.

When pure water is taken in a container and it absorbs $CO_2$ from the atmosphere,what will be the $pH$?

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