Which of these compounds are soluble in water (or react with it)?

a)Chromium(III) oxide b)Arsenic trichloride c)Lead(II) nitrate d)Molybdenum disulfide e)Mercury iodide f)Sodium metavanadate

Aug 8, 2018

Well, $\left(b\right)$, and $\left(c\right)$, and $\left(f\right)$ to a first approx...

Explanation:

Chromic oxide, and $M o {S}_{2}$, and $H g {I}_{2}$ are all as soluble as bricks in aqueous phases. On the other hand, $A s C {l}_{3}$, the old so-called $\text{butter of arsenic}$, would swiftly react with water according to the following equation..

$A s C {l}_{3} \left(l\right) + 3 {H}_{2} O \left(l\right) \rightarrow A s {\left(O H\right)}_{3} \left(a q\right) + 3 H C l \left(a q\right)$

$P b {\left(N {O}_{3}\right)}_{2}$ speciates in aqueous solution to give stoichiometric $P {b}^{2 +}$ and $N {O}_{3}^{-}$. Note that MOST nitrate salts are water soluble...given that the anion is not very charge dense.

Sodium metavanadate, $N {a}^{+} V {O}_{3}^{-}$ would have some considerable water solubility. Did I get them all?