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CaSO4 <---H2O---> Ca²⁺ + SO4²⁻ trudno rozpuszczalna sól
K2S <---H2O---> 2 K⁺ + S²⁻
K+ + (NO3)-
siarczan (VI)wapnia(II) - CaSO4
Ca2+ + (SO4)2-
siarczek potasu - K2S
2K+ + S2-