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Which base is most suitable to prepare a...

Which base is most suitable to prepare a buffer solution with a pH =11.00 ?

A

Ammonia `(K_b=1.8xx10^(-5))`

B

Aniline `(K_b=4.0xx10^(-10))`

C

Methylamine `(K_b=4.4xx10^(-4))`

D

Pyridine `(K_b=1.7xx10^(-9))`

Text Solution

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The correct Answer is:
c
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Questions based on Buffer Solution

Which one of the following mixtures is suitable for making a buffer solution will an optimum pH of 9.2 - 9.3 ?

The pH of basic buffer mixtures is given by : pH=pK_(a)+log((["Base"])/(["Salt"])) , whereas pH of acidic buffer mixtures is given by: pH= pK_(a)+log((["Salt"])/(["Acid"])) . Addition of little acid or base although shows no appreciable change for all practical purpose, but since the ratio (["Base"])/(["Salt"]) or (["Salt"])/(["Acid"]) change, a slight decrease or increase in pH results in. Mole of HCI required to prepare a buffer solution of pH=8.5 with 0.1 mole of NaCN in one litre solution is: (pK_(a) for CN^(-)=4.61)

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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 ?

GRB PUBLICATION-IONIC EQUILIBRIUM-All Questions
  1. A buffer solution made with NH3 and NH4Cl has a pH of 10.0 which proce...

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  2. 1.0 L of an aqueous solution in which [H2CO3]=[HCO3^-]=0.10 M, has [H^...

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  3. Which base is most suitable to prepare a buffer solution with a pH =11...

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  4. HCOOH (aq) hArr H^+(aq) +HCOO^-(aq),Ka=1.7xx10^(-4) The ionization o...

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  5. A student is asked to prepare a buffer solution with a pH of 4.00. Thi...

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  6. What is the pH of a solution that is 0.20 M in HF and 0.40 M in NaF ? ...

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  7. 1 M benzoic acid (pKa=4.20) and 1 M C6H5COONa solutions are given sepa...

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  8. What is the difference in pH for 1//3 and 2//3 stages of neutralizatio...

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  9. To prepare a buffer of pH 8.26, amount of (NH(4))(2)SO(4) to be added ...

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  10. How many moles of NaOCI must be added to 150 mL of 0.025 MHOCI to obta...

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  11. 1 M NaCl and 1 M HCl are present in an aqueous solution. The solution ...

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  12. The pK(a) of a weak acid (HA) is 4.5. The pOH of an aqueous buffered s...

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  13. A buffer solution contains 1 mole of (NH(4))(2)SO(4) and 1 mole of NH(...

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  14. In which of the following combinations, is buffer action expected ? ...

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  15. Which solution is not a buffer solution ?

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  16. Which species has the lowest concentration in a solution prepared mixi...

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  17. Which may be added to one litre of water to act a buffer?

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  18. 50 mL of 2N acetic acid mixed with 10 mL of 1N sodium acetate solution...

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  19. The pH of an acidic buffer mixture is:

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  20. A certain buffer solution contains equal concentartion of X^(Theta) an...

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