The ${\mathrm{pK}}_{\mathrm{a}}$ of acetyl salicylic acid (aspirin) is $3·5$ . The $\mathrm{pH}$ of gastric juice in the human stomach is about $2-3$ and the $\mathrm{pH}$ in the small intestine is about $8$. Aspirin will be

An inert gas is added to the following equilibrium,

$\mathrm{A}\left(\mathrm{s}\right)+2\mathrm{B}\left(\mathrm{g}\right)\rightleftharpoons 3\mathrm{C}\left(\mathrm{g}\right)$ at constant pressure. The equilibrium 

Calculate the molar solubility of  $\mathrm{AgCl}$ in $1.0 \mathrm{M} {\mathrm{NH}}_3.{\mathrm{K}}_{\mathrm{sp}}\left(\mathrm{AgCl}\right)=1.8\times {10}^{-10}, {\mathrm{K}}_{\mathrm{f}} \left(Ag{\left({\mathrm{NH}}_3\right)}_2^{+}\right)=1.7\times {10}^7$.

Give your answer up to two places of decimal.

Calculate the $\mathrm{pH}$ at the equivalence point, when a solution of $0.1 \mathrm{M} {\mathrm{CH}}_3\mathrm{COOH}$ is titrated with a solution of $0.1 \mathrm{M} \mathrm{NaOH}$, ${\mathrm{K}}_{\mathrm{a}}\left({\mathrm{CH}}_3\mathrm{COOH}\right)=1.8\times {10}^{-5}$.

$(\mathrm{Choose} \mathrm{your} \mathrm{answer} \mathrm{from} \mathrm{these} \mathrm{values} : 4.74/8.72/11.74/7.12)$

The value of ${\mathrm{K}}_{\mathrm{p}}$ for the reaction ${\mathrm{PCl}}_5\rightleftharpoons {\mathrm{PCl}}_3+{\mathrm{Cl}}_2$ is $1.78$ at $250°\mathrm{C}$. The fraction of dissociation is $\mathrm{a} \times {10}^{-4}$ at equilibrium when $0.40$ mole of ${\mathrm{PCl}}_5$ is vaporised in a vessel containing $0.20$ mole of ${\mathrm{Cl}}_2$ gas when the volume is kept constant at $4$ litres.

Calculate the value of $\mathrm{a}$.

Calculate the solubility of $\mathrm{Mg}(\mathrm{OH}{)}_2$ in $0.05 \mathrm{M} \mathrm{NaOH}$.

${\mathrm{K}}_{\mathrm{sp}}\left(\mathrm{Mg}(\mathrm{OH}{)}_2\right)=8.9\times {10}^{-12}$.

(Report your answer in multiples of ${10}^{-9}$.)

$0.1 \mathrm{mole}$ of each ethyl alcohol and acetic acid are allowed to react, and at equilibrium, the acid is exactly neutralised by $100 \mathrm{mL}$ of $0.85 \mathrm{N}$ $\mathrm{NaOH}$. If no hydrolysis of an ester is supposed to have been undergone, the Equilibrium constant, which is given as $\mathrm{a} \times {10}^{-3}$, give the value of $\mathrm{a}$.

Give the answer to the nearest integer value.