Titration is the determination of quantity by a known amount. The pH of the solution after the solution was added with 650 mL of hydrochloric acid is 13.4.
pH is the calculation of the hydrogen ion concentration in the solution and can be used to determine the acidity or the basicity of the solution.
Given,
M₁ = 0.40 M
V₁ = 550 mL
M₂ = 0.25 M
V₂ =?
Volume at 0.25 M is calculated as,
M₁V₁ = M₂V₂
0.40 × 550.0 =0.25 × V2
V2 = 880 ml
880 mL of HCl is required for the neutralization reaction.
The final molar concentration of NaOH is,
550 × M₁ = 0.25 × 650
M₁ = 0.295 M
pH is calculated as:
pOH = -log [OH⁻]
= -log [0.295]
= 0.529
Solving further,
pH+ pOH = 14
pH = 14 - pOH
= 14 - 0.529
= 13.4
Therefore, 13.4 is the pH of the solution.
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