Solubility trends of Group 2 sulfates
Solubility trends of Group 2 sulfates
Real World
Barium sulfate's extreme insolubility makes it safe to swallow as a 'barium meal' before hospital X-rays — despite barium ions being toxic, the sulfate never dissolves enough to release harmful Ba²⁺ ions.
Exam Focus
Learn this trend as the opposite of hydroxides. If asked for a test for sulfate ions, state 'add BaCl₂(aq) then HCl(aq)' and describe the white precipitate.
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