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K(a) for butyric acid is 2.0xx10^(-5). C...

`K_(a)` for butyric acid is `2.0xx10^(-5)`. Calculate pH and hydroxyl ion concentration in `0.2M` aqueous solution of sodium butyate.

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To solve the problem, we need to calculate the pH and hydroxyl ion concentration in a 0.2 M aqueous solution of sodium butyrate (NaC₄H₇O₂). Sodium butyrate is the sodium salt of butyric acid (HC₄H₇O₂), and it will dissociate in water to give butyrate ions (C₄H₇O₂⁻) and sodium ions (Na⁺). The butyrate ion can act as a weak base in water. ### Step-by-step Solution: 1. **Identify the Reaction:** The butyrate ion (C₄H₇O₂⁻) can accept a proton (H⁺) from water, leading to the formation of butyric acid (HC₄H₇O₂) and hydroxide ions (OH⁻): \[ C₄H₇O₂^- + H₂O \rightleftharpoons HC₄H₇O₂ + OH^- ...
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Knowledge Check

  • pH of a solution is 5. Its hydroxyl ion concentration is

    A
    `5 M`
    B
    `10 M`
    C
    `10^(-5)M`
    D
    `10^(-9)M`

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