Chemistry Chemical Bonding and Molecular Structure

pH of acidic buffer is given by,

pH = pKa + log₁₀ $\frac{\left[Salt\right]}{\left[acid\right]}$ $\frac{}{}$

or, $p=pka+lo{g}_{10}\frac{\left[C{H}_{3}C{H}_{2}CO{O}^{-}\right]}{\left[C{H}_{3}C{H}_{2}COOH\right]}$ ${}_{}\frac{{}_{}{}_{}{}^{}}{{}_{}{}_{}}$

or, $\left[H^{+}\right]=k_a\frac{\left[C{H}_{3}C{H}_{2}COOH\right]}{\left[C{H}_{3}C{H}_{2}CO{O}^{-}\right]}$ ${}^{}{}_{}\frac{{}_{}{}_{}}{{}_{}{}_{}{}^{}}$

$\frac{\left[C{H}_{3}C{H}_{2}CO{O}^{-}\right]}{\left[C{H}_{3}C{H}_{2}COOH\right]}=\frac{k_a}{\left[H^{+}\right]}=\frac{1.3*10^{-5}}{10^{-4}}=0.13$

Covalent character is $LiC\mathcal{l}>NaC\mathcal{l}>KC\mathcal{l}>CsC\mathcal{l}.$  As the cationic size increases polarization decreases.

Both indicated hydrogen atoms repel each other so due steric hinderance the given compound becomes non planar. It is non-aromatic.

BrF₅       -             Square pyramid

[CrF₆]^3- -             Octahedral

O₃          -             Bent

PCl₅       -             Trigonal Bipyramid

According to Fajan's rule,

Covalent character $\propto$ size of anion

$\therefore Ca{F}_2<CaC{l}_2<CaB{r}_2<Ca{l}_2$