Chromyl chloride vapors are dissolved in water and acetic acid and barium acetate solution are added, then :

Chromyl chloride vapors are dissolved in water and acetic acid and barium acetate solution are added, then a yellow precipitate will be obtained

$\underset{(\mathrm{chromyl} \mathrm{chloride}) }{{\mathrm{Cr}}_2{\mathrm{Cl}}_2+2{\mathrm{H}}_2\mathrm{O}}\to \underset{(\mathrm{chomic} \mathrm{acid})}{2\mathrm{HCl}}+\underset{(\mathrm{yellow} \mathrm{solution})}{{\mathrm{H}}_2{\mathrm{CrO}}_4}$

${\mathrm{H}}_2{\mathrm{CrO}}_4+{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2\mathrm{Pb}\stackrel{{\mathrm{CH}}_3\mathrm{COOH}}{\to }\underset{ (\mathrm{yellow} \mathrm{ppt}.)}{{\mathrm{PbCrO}}_4}\downarrow +2{\mathrm{CH}}_3\mathrm{COOH}$