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Q.

pKa  of NH4+  is 9.26. Hence, effective range of PH for NH4OHNH4Cl  buffer is ?

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a

8.26 to 10.26

b

4.74 to 5.74

c

3.74 to 5.74

d

8.26 to 9.26

answer is A.

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Detailed Solution

pKb(NH4OH)=14pKa(NH4+=4.74)

So, buffer range, pKb±1

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pKa  of NH4+  is 9.26. Hence, effective range of PH for NH4OH−NH4Cl  buffer is ?