3) What is the best description of an aqueous solution at 25 o C with an OH - co
ID: 1024905 • Letter: 3
Question
3) What is the best description of an aqueous solution at 25 oC with an OH- concentration of 1.7 x 10-9M?
It is basic since it contains some OH- ions.
The solution is acidic.
It is neutral.
More information is needed to say anything with certainty.
4) Which of the following would have the highest pH?
(This can be done without any calculations.)
0.20 M HNO3(aq)
0.40 M HNO3(aq)
0.20 M HNO2(aq)
0.40 M HNO2(aq)
It is basic since it contains some OH- ions.
The solution is acidic.
It is neutral.
More information is needed to say anything with certainty.
4) Which of the following would have the highest pH?
(This can be done without any calculations.)
0.20 M HNO3(aq)
0.40 M HNO3(aq)
0.20 M HNO2(aq)
0.40 M HNO2(aq)
Explanation / Answer
3.
Since pOH < 10-7 M,
(b)
The solution is acidic in nature.
[OH-] = 1.7 * 10-9 M
pOH = -Log[OH-] = - Log(1.7 * 10-9) = 8.77
pH = 14 - pOH = 14 - 8.77 = 5.23
Since, pH < 7.0 the solution is acidic.
4.
Since HNO3 is strong acid it undergoes complete ionisation but HNO2 is weak acid that undergoes partial ionisation.
Weaker is the acid higher is the pH.
So,
0.20 M HNO2 has highest pH
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