# Chapter 3 - Chemical Reactions - Problem Solving Practice 3.4 - Page 102: d

Soluble

#### Work Step by Step

A water soluble substance will break into cations and anions when placed in water. Thus, in order to make a guess whether or not it is soluble, see if you can find an anion and a cation in this substance. At this point in the course, if you can find a cation and an anion, then it will most likely be soluble. We see that there is $Mg^{2+}$ and $O^{2-}$, so it is soluble.

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