Kaplan Practice Test Question

[flin5845]

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Which of the following pH values are possible for a solution described as acidic at room temperature?

I. -1
II. 4
III. 7
IV. 10

The answer was I and II. I choice just II....Since when does the pH range go into negative numbers?

 

[AlbinoPolarBear]

Which of the following pH values are possible for a solution described as acidic at room temperature?

I. -1
II. 4
III. 7
IV. 10

The answer was I and II. I choice just II....Since when does the pH range go into negative numbers?

pH = -log[H+]

When [H+] = 0.1 M (10^-1 M), then pH = 1
When [H+] = 1 M (10^0 M), then pH = 0
When [H+] = 10 M (10^1 M), then pH = -1

In extremely concentrated acids, like concentrated HCl (12M), H2SO4 (18M) or HNO3 (16M), they will all have negative pH's.

Hope this helps.