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Answered by
10
The answer is D
Acids always lower the pH below 7
No matter what the concentration, the pH will always be less than 7. Here, the concentration is very less, so it is almost neutral or very slightly acidic.
I know pH=-log(H+) but that would give a value of 8, which would mean that the solution is basic, which is a clear contradiction as an acid has been added.
So, as u can see, IIT asks questions based on simple concepts, but twisting it in a confusing way.
Acids always lower the pH below 7
No matter what the concentration, the pH will always be less than 7. Here, the concentration is very less, so it is almost neutral or very slightly acidic.
I know pH=-log(H+) but that would give a value of 8, which would mean that the solution is basic, which is a clear contradiction as an acid has been added.
So, as u can see, IIT asks questions based on simple concepts, but twisting it in a confusing way.
Answered by
40
Answer:
d. between 6 and 7
Explanation:
In this situation, it cannot be ignored the (H+) ions from water.
[H+] ions is also known as [H3O+] ions.
[H3O+] = [H3O+] from water + [H3O+] from acid
[H3O+] = 10^-7 + 10^-8
=> [H3O+] = 10 × 10^-8 + 10^-8
=> [H3O+] = 1.1 × 10^-7
pH = -log[H3O+]
or, pH = -log[H+]
=> pH = -log [1.1 × 10^-7] = 6.98
.°. pH = 6.98
.°. pH = between 6 and 7
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