Answer :
Answer:
The most basic solution is A
Explanation:
In order to solve the problem, we can compare the pH of the solutions. The most basic solution is the one with the highest pH.
A. [H⁺] = 1 × 10⁻¹⁰ M
pH = - log [H⁺] = - log (1 × 10⁻¹⁰) = 10
B. pOH = 6.7
pH = 14 - pOH = 14 - 6.7 = 7.3
C. [OH⁻] = 7 × 10⁻⁵ M
pOH = - log [OH⁻] = -log (7 × 10⁻⁵) = 4.15
pH = 14 - pOH = 14 - 4.15 = 9.8
D. pH = 4.2
According to this, solution A has the highest pH (pH=10), thus this is the most basic solution.