Question

How can we determine Chromium ion in a sample other than borax bead test or cobalt nitrate test?

Answer 1

Answer on Question #57535 – Chemistry – Inorganic chemistry

Question: How can we determine Chromium ion in a sample other than borax bead test or cobalt nitrate test?

Answer:

1) $\mathrm{Cr}^{3+} + 3\mathrm{OH}^{-} \rightarrow \mathrm{Cr}(\mathrm{OH})_{3}\downarrow$ (green precipitate)

$\mathrm{Cr(OH)}_3 + 3\mathrm{OH}^- \rightarrow [\mathrm{Cr(OH)}_6]^{3-}$ (green solution)

2) $2 \mathrm{Cr}^{3+} + 3 \mathrm{OCl}^{-} + 10 \mathrm{OH}^{-} \rightarrow 3 \mathrm{Cl}^{-} + 5 \mathrm{H}_{2} \mathrm{O} + 2 \mathrm{CrO}_{4}^{2-}$ (yellow solution)

$\mathrm{Ba}^{2+} + \mathrm{CrO}_{4}^{2-} \rightarrow \mathrm{BaCrO}_{4}\downarrow$ (yellow precipitate)

www.AssignmentExpert.com