Which Equation Is NOT Required to Determine the PH of 0.10

question 20

Multiple Choice

Which equation is NOT required to determine the pH of 0.10 M solution of weak acid,HA?

• A)HA + H₂O ⇋ A⁻ + H₃O⁺ K_a = 2.4 × 10⁻⁶
• B)H₂O + H₂O ⇋ H₃O⁺ + OH⁻ K_w = 1 × 10⁻¹⁴
• C)0)10 = [HA] + [A⁻]
• D)[H₃O⁺] = [OH⁻] + [A⁻]
• E)A⁻ + H₂O ⇋ HA + OH⁻ K_b = 4.2 × 10⁻⁹

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