Question

Is magnesium carbonate soluble in water?

Answer 1

Solubility rules holds that all carbonates are insoluble, save for those of the alkali metals. So, the answer is no.

Explanation:

As physical scientists we should look at the data. This source quotes the solubility as `0.0106` `g` per `100*mL` of water. So the stuff is pretty insoluble.

Of course, this presupposes a neutral `pH`. Bicarbonates, salts of `HCO_3^-` are very soluble.