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If after addition of 'V litres of water in 1 litre solution of $2.5 x 10^{- 3} M Ba {(OH)}_{2}, pOH$ of solution becomes 3 times, and if V is expressed in scientific notation as $x \times 10^{y}$ then calculate value of y.

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answer is 5.

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Detailed Solution

$Ba {(OH)}_{2} = {BA}^{+} + 2 {OH}^{-}$

Now, $m_{1} v_{1} = m_{2} v_{2}$

Given: $v_{1} = 1 liter$ , $m_{1}$ = $2.5 \times 10^{- 3} M$ ,

$V_{2}$ = $x \times 10^{y}$

By using this formula,

$V = 1 .1 \times 10^{5}, y = 5$

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