alleryStart learning →Which group of cations forms soluble compounds with no exceptions listed in the solubility guidelines?
AGroup 1 metal cations and ammonium ion
BGroup 2 metal cations and ammonium ion
CSilver, lead and mercury(I) cations
DIron(III), lead and barium cations
Answer & Solution
Correct answer: A. Group 1 metal cations and ammonium ion
1. The solubility guidelines list group 1 cations, that is Li+, Na+, K+, Rb+ and Cs+, together with NH4+.
2. Against that row the exceptions column reads none.
3. So any salt of these cations may be taken as soluble.
4. Silver, lead and mercury(I) appear instead in the exception lists for halides and sulfates.
5. Group 2 cations appear among the exceptions for fluorides and sulfates, so they are not exception free.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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