Question

When is an aqueous solution basic? What pH?

Answer 1

It is basic at `25^@ "C"` and `"1 atm"`, when pH is greater than 7.

Explanation:

For any aqueous solution at `25^@ "C"` and `"1 atm"`:

• `"pH" = 7 rightarrow "neutral"`
• `"pH" < 7 rightarrow "acidic"`
• `"pH" > 7 rightarrow "basic"`

We may note that pH can take any value (even negative values or equal to zero).

P.S. I do not have too much time, but I strongly recommend you to take a look at the definition of pH as the logarithm of `"H"^{+}"` concentration, i.e. `"pH" = -log["H"^(+)]`.

Answer 2

Basic

Explanation:

The higher the pH number is, the more alkaline (or basic) it gets.
Neutral is 7 so anything higher than 7 is alkaline and anything lower than 7 is acidic.