Calculate the density of an object with a mass of 220 and a volume of 145mL.
1 answer:
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Answer : The correct option is (d) a solution of 0.10 M NaOH
Explanation :
<u>(a) a solution of pH 3.0</u>
First we have to calculate the pOH.
Now we have to calculate the concentration.
Thus, the concentration is,
<u>(b) a solution of 0.10 M </u>
As we know that 1 mole of is a weak base. So, in a solution it will not dissociates completely.
So, the concentration will be less than 0.10 M
<u>(c) a solution with a pOH of 12.</u>
We have to calculate the concentration.
Thus, the concentration is,
<u>(d) a solution of 0.10 M NaOH</u>
As we know that is a strong base. So, it dissociates to give
ion and
ion.
So, 0.10 M of in a solution dissociates to give 0.10 M of
ion and 0.10 M of
ion.
Thus, the concentration is, 0.10 M
<u>(e) a solution of
</u>
As we know that 1 mole of in a solution dissociates to give 1 mole of
ion and 1 mole of
ion.
So, of
in a solution dissociates to give
of
ion and
of
ion.
The concentration of ion is
First we have to calculate the pH.
Now we have to calculate the pOH.
Now we have to calculate the concentration.
Thus, the concentration is,
From this we conclude that, a solution of 0.10 M NaOH possess the greatest concentration of hydroxide ions.
Hence, the correct option is (d)