1.

pH value of which one of the following is not equal to one

Answer»

`0.1 M HNO_(3)`
0.05 M `H_(2)SO_(4)`
`0.1 M CH_(3)COOH`
`50 cm^(3)` of `0.4 M HCl + 50 cm^(3)` of .2 NaOH

Solution :`PH = -log [H^(+)]`
(a) value of pH `= 0.1 M HNO_(3) = -log[0.1] = 1`
(b) Value of pH `= 0.05 H_(2)SO_(4) = -log [2 xx 0.05] = 1`
(c) Value of pH `= 0.1 M CH_(3)COOH != 1` as it is a weak acid so, will not undergo complete ionization.
(d) Milli-equivalent of acid `= 50 xx 0.4 = 20`
Milli-equivalent of BASE `= 50 xx 0.2 = 10`
Remaining acid `= 20 -10 = 10` milli-eq.
`[H^(+)] = (10)/(50+50) = (10)/(100) = 0.1`
`pH = -log[H^(+)] = 1`.


Discussion

No Comment Found

Related InterviewSolutions