What is the best description for a solution with a hydroxide-ion concentration equal to 1 x 10-4m?

Basic solution.

Explanation:

∵ pOH = -log[OH⁻] = - log(1.0 x 10⁻⁴) = 4.

∵ pH + pOH = 14.

∴ pH = 14 - pOH = 14 - 4 = 10.

Since, the pH of the solution is 10 (> 7) and the concentration of [OH⁻]  is 1.0 x 10⁻⁴ (> 1.0 x 10⁻⁷) is a basic solution.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm