Answer:
pH = 7.0
Explanation:
When HCl reacts with NaOH, H₂O and NaCl are produced, thus:
HCl + NaOH → H₂O + NaCl
At equivalence point, all HCl reacts with NaOH. The only you will have is water.
Equilbrium of water is:
H₂O(l) ⇄ H⁺(aq) + OH⁻(aq)
K = 1x10⁻¹⁴ = [H⁺] [OH⁻]
As H⁺ = OH⁻ because both are produced from the same water-
1x10⁻¹⁴ = [H⁺]²
1x10⁻⁷M = [H⁺]
As pH = -log= [H⁺]
pH = 7.0
-The pH at equivalence point in the titration of a strong acid with a strong base is always 7.0-
