Question

0.4 mole NaOh aqueous solution means​

Answer 1

Answer:

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Explanation:

Molecular mass of NaOH=(23+16+1)=40

No. of moles of 0.4 g of NaOH =

40

0.4

= 0.01 mole

0.01 mole of NaOH in 1 lit.

Hence, molarity =

volume

mole

=10

−2

M

As NaOH is a strong electrolyte, it dissociates completely.

Hence, [NaOH]=[OH

−

]

Now,

pOH=−log[OH

−

]=−log(10

−2

)=2

Again,

pOH+pH=14

∴pH=14−2=12