A 0.0250L solution of HCl is neutralized by 0.0780L of an unknown Mg(OH)2 solution. Also 0.050L of this Mg(OH)2 solution is neutralized by 0.0300L of a 0.20 M H3(PO3) solution. What is the concentration of the HCl solution

Explanation:

Hello!

In this case, for the first reaction we need to focus on, the neutralization of magnesium hydroxide by phosphoric acid, we can write up the following equation:

Whereas the acid and base react in a 3:2 mole ratio; thus, we can write:

Now, solving for the concentration of the magnesium hydroxide solution we get:

Now, for the reaction between hydrochloric acid and magnesium hydroxide we have:

Therefore, solving for the concentration of the hydrochloric acid solution we get:

Best regards!

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).