# What are the phases for the equation below?

The equation is Mg(OH)2  +  2 HNO3   --->   Mg(NO3)2   +   2 H2O but it also asks for the phases, but I do not know if some are liquid, aqueous, or solid.  Thanks!

Relevance

Mg(OH)2 (s)   +  2 HNO3(aq)    →  Mg(NO3)2 (aq)   +   2 H2O (l)

s = solid

aq = in aqueous solution

l = liquid

• Thanks!

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• I am thinking that the Mg(OH)2 and Mg(NO3)2 are solids, the nitric acid is aqueous, and the water is liquid.  Basically what Trevor said, except that the magnesium nitrate would be a solid or it would have been written in terms of ions (with a charge notation).  It is definitely not intended to be an ion complex in solution, in that particular context.  It would be a solid, presumably the solid that would precipitate when the magnesium hydroxide dissolved into the acid.

The acid would leach the hydroxide, and the nitrate would combine with the Mg2+ once enough Mg2+ was in the solution.  this would not be a solid-solid transition reaction.  It is a dissolve and precipitate (dissolution-precipitation) reaction.

• Magnesium nitrate, Mg(NO3)2, is quite soluble in water and is NOT a solid.  It does not precipitate, but stays in solution as a pair of ions.

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