How many moles of #Cl^-# ions are needed to completely combine with 0.25 moles of #Mg^(2+)# ions?
In all these sorts of problems, reference to a balanced chemical equation is necessary as a first step:
This equation is balanced with respect to (i) mass, and (ii) charge, and is therefore a reasonable representation of chemical reality, of physical reality if you like. The equation clearly states that each equiv magnesium ion requires 2 equiv of chloride ion to form the salt. Since we started with a given NUMBER of
Why do I refer to the