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

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1 Answer
anor277 · Truong-Son N.
Aug 8, 2018

Well, #(b)#, and #(c)#, and #(f)# to a first approx...

Explanation:

Chromic oxide, and #MoS_2#, and #HgI_2# are all as soluble as bricks in aqueous phases. On the other hand, #AsCl_3#, the old so-called #"butter of arsenic"#, would swiftly react with water according to the following equation..

#AsCl_3(l) + 3H_2O(l) rarr As(OH)_3(aq) + 3HCl(aq)#

#Pb(NO_3)_2# speciates in aqueous solution to give stoichiometric #Pb^(2+)# and #NO_3^(-)#. Note that MOST nitrate salts are water soluble...given that the anion is not very charge dense.

Sodium metavanadate, #Na^+VO_3^(-)# would have some considerable water solubility. Did I get them all?

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