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The pH of buffer of NH4OH + NH4Cl - type...

The pH of buffer of `NH_4OH + NH_4Cl` - type is given by -

A

`pH =Pk_(b)`

B

`pH =1//2pK_(b)-1//2"log [salt]/[base]"`

C

`pH =14-pK_(b)-"log [salt]/[base]"`

D

`pH =pOH-pK_(b)+"[salt]/[base]"`

Text Solution

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The correct Answer is:
C
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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. The amount of (NH_(4))_(2)SO_(4) to be added to 500 mL of 0.01M NH_(4)OH solution (pK_(a) for NH_(4)^(+) is 9.26) prepare a buffer of pH 8.26 is:

Assertion : Buffer solutions are those which resist change in pH value on the addition of a small amount of acid or a base to it. Reason: Mixture of NH_4OH and NH_4 Cl acts as basic buffer.

1 lit of buffer solution contains 0.1 mole each of NH_(4)OH and NH_(4)Cl . What will be the P^(H) of the solution when 0.01 mole of HCl is added to it [ P^(Kb) of NH_(4)OH = 4.74 ]

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 in Ph for all practical purposes, but sicne the ratio (["Base"])/(["Salt"]) or (["Salt"])/(["Acid"]) changes, a slight decrease or increase in pH results. The amount of (NH_(4))_(2)SO_(4) to be added to 500mL of 0.01 M NH_(4)OH solution (pH_(a)NH_(4)^(+) is 9.26) to prepare a buffer of pH 8.26 is :

NH_4Cl is a salt of a

MOTION-IONIC EQUILIBRUIM-Exercise -1
  1. H^(+) ion concentration of water does not change by adding:

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  2. Which of the following will produce a buffer sollution when mixed in e...

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  3. The pH of buffer of NH4OH + NH4Cl - type is given by -

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  4. A buffer solution can be prepared by mixing solution of:

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  5. Which one of the following mixture does not act as a buffer solution?

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  6. In the neutralization process of H3PO4 and NaOH, the number of buffers...

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  7. H(2)CO(3)+NaHCO(3) found in blood helps in maintaining pH of the blood...

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  8. pH range of colour change for methyl orange indicator is-

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  9. The colour of phenolphthalein in acid is-

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  10. Methyl orange is an example of :

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  11. Phenolphthalein is-

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  12. According to Modern quinoid theory the indicator used in acid-alkali t...

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  13. Phenolphthalein shows colour change in a definite pH range, which is-

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  14. If s is the molar solubility of Ag2SO4, then

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  15. Which of the following would increase the solubility of Pb(OH)(2)?

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  16. The aqueous solution of which of the following sulphides would contain...

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  17. Which of the following has the maximum solubility in water?

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  18. The necessary condition for saturated solution is –

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  19. At 30^(@) C the solubility of Ag(2)CO(3) (K(SP)=8xx10^(-12)) would be ...

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  20. Which of the following expressions shows the saturated solution of PbS...

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