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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Self Evaluation Test - Equilibrium

  • question_answer
    What would be the pH of a solution obtained by mixing 5g of acetic acid and 7.5g of sodium acetate and making the volume equal to 500 mL? \[({{K}_{a}}=1.75\times {{10}^{-5}},p{{K}_{a}}=4.76)\]

    A) \[pH=4.70\]

    B) pH < 4.70

    C) pH of solution will be equal to pH of acetic acid

    D) 4.76 < pH < 5.0

    Correct Answer: D

    Solution :

    [d] \[pH=p{{K}_{a}}+log\frac{[salt]}{[acid]}\] \[=4.76+log\frac{\frac{7.5}{100}}{\frac{5}{500}}=4.7+log1.5=4.87\] Hence correct answer is \[4.76<pH<5.0\]


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