estimate the pH of a solution that is 0.10 M Sr(OH) a.very acidic b slightly acidic c. slightly basic d. strongly basic?

The answer: d. strongly basic

Qualitative explanation:
Sr(OH)₂ completely dissociates in aqueous solution to give Sr²⁺ and OH⁻ ions. Due to the presence of sufficient OH⁻ ions in aqueous solution, dilute Sr(OH)₂ solution is strongly basic.

Quantitative explanation:
1 mole of Sr(OH)₂ completely dissociates in aqueous solution to give 2 moles of OH⁻ ions.
[OH⁻] in 0.10 M Sr(OH)₂ = (0.1 M) × 2 = 0.2 M
pOH = -log[OH⁻] = -log(0.2) = 0.7
pH = 14 - pOH = 14 - 0.7 = 13.3
pH 13.3 is a very basic solution.

c. slightly basic