Question

A 1l solution contains 0.2 m nh4oh and 0.2m nh4cl.if 1ml of 0.001m hcl is added to it.what will be the conc. of oh- of the resulting solution .(kb=2*10^-5)

Answer 1

Answer:

Correct option is

A

2×10−5

Concentration oF NH4OH=0.2M

Concentration of NH4Cl=0.2M

Concentration OF HCl=0.001M

Kb=2×10−5

Applying Henderson Equation

POH=PKa+log[basesalt]

POH=5−log2+log0.20.2

=5−log2

Hence,

[OH−]=2×10−5

so, the option (A) is the correct answer

Answer 2

Answer:

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Explanation:

Concentration oF NH4OH=0.2M

Concentration of NH4Cl=0.2M

Concentration OF HCl=0.001M

Kb=2×10−5

Applying Henderson Equation

POH=PKa+log[basesalt]

POH=5−log2+log0.20.2

=5−log2

Hence,

[OH−]=2×10−5