What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Ans: pH = 9

Given:

Concentration of H+ ions [H+] = 1.0*10⁻⁹ M

To determine:

The pH of the above solution

Explanation:

pH = -log[H+]

pH = -log(1.0*10⁻⁹) = 9

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%