The dissociation constant of acetic acid is x × 10-5. When 25 mL of 0.2 M CH 3 COONa solution is mixed with 25 mL of 0.02 M CH 3 COOH solution, the pH of the resultant solution is found to be equal to 5 . The value of x is

Question

The dissociation constant of acetic acid is x × 10-5. When 25 mL of 0.2 M CH 3 COONa solution is mixed with 25 mL of 0.02 M CH 3 COOH solution, the pH of the resultant solution is found to be equal to 5 . The value of x is  (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Buffer of HOAc and NaOAc pH = pKa + log (0.1/0.01) 5= pKa +1 pKa =4 Ka =10-4 x =10

Q. The dissociation constant of acetic acid is $x \times 1 0^{- 5}$ . When $25 m L$ of $0.2 M C H_{3} COON a$ solution is mixed with $25 m L$ of $0.02 M C H_{3} COO H$ solution, the $p H$ of the resultant solution is found to be equal to 5 . The value of $x$ is ___

Buffer of $H O A c$ and $N a O A c$
$p H = p K a + lo g \frac{0.1}{0.01}$
$5 = p K a + 1$
$p K a = 4$
$K a = 1 0^{- 4}$
$x = 10$

Q. The dissociation constant of acetic acid is x×10−5. When 25mL of 0.2MCH3​COONa solution is mixed with 25mL of 0.02MCH3​COOH solution, the pH of the resultant solution is found to be equal to 5 . The value of x is ___

Buffer of HOAc and NaOAc pH=pKa+log0.010.1​ 5=pKa+1 pKa=4 Ka=10−4 x=10

Q. The dissociation constant of acetic acid is $x \times 1 0^{- 5}$ . When $25 m L$ of $0.2 M C H_{3} COON a$ solution is mixed with $25 m L$ of $0.02 M C H_{3} COO H$ solution, the $p H$ of the resultant solution is found to be equal to 5 . The value of $x$ is ___

Buffer of $H O A c$ and $N a O A c$
$p H = p K a + lo g \frac{0.1}{0.01}$
$5 = p K a + 1$
$p K a = 4$
$K a = 1 0^{- 4}$
$x = 10$