Calcium is somewhat insoluble, so the solid commonly forms an equilibrium with its dissolved ions:                                                      CaSO4(s) ⇔  Ca2+(aq) + SO42-(aq) All of the following will affect the position of equilibrium, changing the numbers of dissolved ions in solution, except A. adding Ca(NO3)2 B. adding Na2SO4 C. adding CaSO4(s) D. adding water

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