Destroyer GC problem #43

[dentdavis]

i don't understand the explanation they give: " as a general guideline compounds that contain a group IA metal as well as NH4 will be soluble"

the answer is B: (NH4)3PO4

my problem is...i don't see an alkali metal (IA Metal) in that answer? Am I just ******ed...or are they missing something? Hydrogen isn't considered an alkali metal right?

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[levesque2177]

its saying that either alkali metal salts or ammonia salts are completely soluble in water. its best if you memorize the solubility rules. basically anything that has NH4+ in it in water will never be a solid and anything that has an alkali metal as their cation will also never be a solid in water.

 

[rnbaxter]

Compounds with NH4 in them are water soluble.