Chemistry - Ionic Equilibrium Question with Solution | TestHub

ChemistryIonic EquilibriumMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

$1 M {N H}_{4} O H$ and $1 M H C l$ are mixed to make a total volume of $300 mL$ . If $pH$ of the mixture is $9.26$ and $p K_{a} (N H_{4}^{+}) = 9.26$ then what would be the volume ratio of ${N H}_{4} O H$ and $H C l$ .

Options:

Answer:

Solution:

$p O H = 14 - p H = p K_{b} + \log \frac{x}{300 - 2 x}$
$= 14 - 9.26 = - \log (10^{- 4.74}) + \log \frac{x}{300 - 2 x}$
$\Rightarrow \frac{x}{300 - 2 x} = 1$
$\Rightarrow 300 = 3 x \Rightarrow x = 100 m L$
$\frac{V_{{NH}_{4} OH}}{V_{HCl}} = 2$

Stream:NTA_ABHYASSubject:ChemistryTopic:Ionic EquilibriumSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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