Ask Question
17 April, 08:19

Acetic acid has a Ka of 1.8Ã10â5. Three acetic acid/acetate buffer solutions, A, B, and C, were made using varying concentrations: [acetic acid] ten times greater than [acetate], [acetate] ten times greater than [acetic acid], and [acetate]

+2
Answers (1)
  1. 17 April, 09:19
    0
    sln A: pH = 3.745

    sln B: pH = 5.745

    sln C: pH = 4.745

    Explanation:

    CH3COOH ↔ CH3COO - + H3O + Ka = ([ H3O + ] * [ CH3COO - ]) / [ CH3COOH ] = 1.8 E-5

    sln A:

    ⇒ [ CH3COOH ] = 10 [ CH3COO - ]

    ⇒ [ CH3COO - ] / [CH3COOH ] = 1 / 10

    ⇒ Ka = 1.8 E-5 = [ H3O + ] * (1 / 10)

    ⇒ [ H3O + ] = (10) * (1.8 E-5) = 1.8 E-4

    ⇒ pH = - log (1.8 E-4) = 3.745

    sln B:

    ⇒ [ CH3COO - ] = 10 [ CH3COOH ]

    ⇒ [ CH3COO - ] / [ CH3COOH ] = 10

    ⇒ Ka = 1.8 E-5 = 10 * [ H3O + ]

    ⇒ [ H3O + ] = 1.8 E-5 / 10 = 1.8 E-6

    ⇒ pH = - log (1.8 E-6) = 5.745

    sln C:

    ⇒ [ CH3COO - ] = [ CH3COOH ]

    ⇒ [ CH3COO - ] / [ CH3COOH ] = 1

    ⇒ Ka = 1.8 E-5 = (1) * [ H3O + ]

    ⇒ [ H3O + ] = 1.8 E-5

    ⇒ pH = - log (1.8 E-5) = 4.745
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Acetic acid has a Ka of 1.8Ã10â5. Three acetic acid/acetate buffer solutions, A, B, and C, were made using varying concentrations: [acetic ...” in 📙 Chemistry if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers