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Which of the following solutions contain...

Which of the following solutions containing weak acid and salt of its conjugate base has maximum buffer capaity?

A

`["Salt"] lt ["Acid"]`

B

`["Salt"] =["Acid"]`

C

`["Salt"] gt ["Acid"]`

D

`["Salt"] + ["Acid"]` is minimum

Text Solution

Verified by Experts

The correct Answer is:
B
Maximum buffer capacity, when `pH = pK_(a)`, and this is only possible when `["Salt"] = ["Acid"]`.
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Statement: A micture of the solution of a weak acid and its conjugates base acts as a good buffer. Explanation: The ratio of the conjugates base acid in the mixture does not change substantially when small amount of acids or alkalines are added to the buffer.

Assertion: 0.1 M NaCN+0.05 M HCl solution on mixing in equal volume forms a buffer solution. Reason : The solution after mixing contains a weak acid and its conjugate base and thus acts as buffer.

Which of the following is correct for the solution of the salt of weak acid & weak base ?

Choose the correct combination among the following A) A mixture of weak acid and its salt of strong base acts as acidic buffer B) As number of moles of acid or base required to change the P^(H) of the buffer by one unit increase, the quality of buffer increases. C) Buffer action is maximum at P^(H) = P^(Ka) in case of acidic buffer

A solution capable of maintaining its pH relatively constatn, when either excess acid or excess base is added, is said to be buffered While it is not usually considered a buffered solution, a concentrated solution (10^(-2) M and higher) of a strong acid or stong base is buffered against large changes in pH when acids or bases are added. Buffered solutions are usually those containing a wealk acid and a salt of that weak acid or a weak base and the salt of that weak base. For example a solution containing HAc and NaAC resists large change in pH when acid or alkali is added. For a buffer solution Buiffer capacity is defined as the number of moles of a strong acid or a strong base that causes 1 of the buffer to undergo a 1 unit change in pH. Buffer capacity is maximum when the molar ratio of the two components is unity and the buffer solution is considerred good. Which solution is not a buffer solution ?

For the aqueous solution of a salt of a weak acid abd a weak base,

CENGAGE CHEMISTRY-IONIC EQUILIBRIUM-Ex 8.3
  1. Which of the following is not a buffer?

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  2. In an acidic buffer solution, if some H(2)So(4) is added, its pH will

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  3. Which of the following solutions containing weak acid and salt of its ...

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  4. A weak acid HA has K(a) = 10^(-6). What would be the molar ratio of th...

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  5. The addition of NaH(2)PO(4) to 0.1M H(3)PO(4) will cuase

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  6. On diluting a buffer solution, its pH

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  7. The pH of a solution containing 0.1mol of CH(3)COOH, 0.2 mol of CH(3)C...

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  8. A weak base BOH is titrated with strong acid HA. When 10mL of HA is ad...

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  9. To 1.0L solution containing 0.1mol each of NH(3) and NH(4)C1,0.05mol N...

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  10. The pH of blood is 7,4. If the buffer in blood constitute CO(2) and HC...

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  11. The pH of blood is

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  12. Buffer in blood consists of

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  13. K(a) for HCN is 5 xx 10^^(-10) at 25^(@)C. For maintaining a constant ...

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  14. 18mL of mixture of CH(3)COOH and CH(3)COONa required 6mL of 0.1M NaOH ...

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  15. The pH of blood is maintained by the balance between H(2)CO(3) and NaH...

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  16. Fixed volume of 0.1M benzoic acid (pK(a) = 4.2) solution is added into...

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  17. 0.1mol of RNH(2)(K(b) = 5 xx 10^(-5)) is mixed with 0.08mol of HC1 and...

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  18. A weak acid HX(K(a) = 10^(-5)) on reaction with NaOH gives NaX. For 0....

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  19. The pH of 0.1M solution of the following salts decreases in the order

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  20. The degree of hydrolysis of a salt of W(A) and W(B) in its 0.1M soluti...

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