Answer:
pH = 7.0
Explanation:
The HCl reaction with KOH as follows:
HCl + KOH → H₂O + KCl
To find pH first we need to know how many moles of each reactant reacts as follows:
HCl = 0.1000L * (0.18 mol / L) = 0.018 moles HCl
KOH = 0.06667L * (0.27mol / L) = 0.018 moles KOH
That means all HCl reacts with all KOH and you will have in solution just water. The equilibrium of water is:
H₂O(l) ⇆ H⁺(aq) + OH⁻(aq)
K = 1x10⁻¹⁴ = [H⁺] [OH⁻]
As the amount of H⁺ = OH⁻:
1x10⁻¹⁴ = [H⁺]²
[H⁺] = 1x10⁻⁷M
as pH = -log [H⁺]
