MCQ
When a salt of weak acid and weak base is dissolved in water at $25\,^oC$, the $pH$ of the resulting solution will always
- Abe $7$
- Bbe greater than $7$
- Cbe less than $7$
- ✓depend upon $K_a$ and $K_b$ values
Hydrolysis constant $\left( K _{ h }\right)=\frac{ K _{ w }}{ K _{ a } \times K _{ b }}$
Degree of hydrolysis, $h=\sqrt{K_h}=\sqrt{\frac{K_w}{K_a \times K_b}}$ when $h\, \ll\, 1$
$pH =\frac{1}{2}\left[ pK _{ w }+ pK _{ a }- pK _{ b }\right]$
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$2 SO _2( g )+ O _2( g ) \rightleftharpoons 2 SO _3( g ), \Delta H =-190\,kJ$
The number of factors which will increase the yield of $SO _3$ at equilibrium from the following is $.............$.
$A.$ Increasing temperature
$B.$ Increasing pressure
$C.$ Adding more $SO _2$
$D.$ Adding more $O _2$
$E.$ Addition of catalyst