An unknown substance is added to a solution and the pH increases. The substance is best described as a(n) An unknown substance is added to a solution and the pH increases. The substance is best described as a(n) .

Basic

Explanation:

When a base is added to a solution, the pH rises. A rise in pH is indicative of turning into basic solution

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).