1.

Which of the following solutions have different pH? 100mL" of "0.2m" "HCl +100mL" of "0.4 M" "NH_(3) 50mL" of "0.1 M" HCl +"50mL" of "03.2 M NH(3) 10 mL of 0.3" M "HCl +100mL of 0.6 M NH_(3)

Answer»

I &ii
ii & iii
I & iii
all will have same `PH`.

Solution :(a) `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.2M,,0.1,,0.1,,0),(0.1,,0,,0.1,,0.1):}`
`pOH=pK_(b)`
(b) `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.1M,,0.05,,0,,0),(0.05,,0,,0.05,,):}`
`pOH=pK_(b)+log(((0.05)/(0.05)))=pK_(b)`
c `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.3,,0.15,,,,),(0.15,,0,,0.15,,):}`
`pOH=pK_(b)` so all solution have same `pH`.


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