Answer
- No, we can't conclude that a solution with pH = 6.7 is acidic.
- We need to know the temperature of the solution.
- Yes, the pH can be 0 or negative.
- A solution with $1.0M$ of $[H_3O^+]$ has pH = 0.
- A solution with $10.0M$ of $[H_3O^+]$ has pH = -1.
Work Step by Step
The temperature can change the equilibrium of the reaction:
$2H_2O(l) \lt -- \gt H_3O^+(aq) + OH^-(aq)$
- Therefore, it can change the $K_w$, where the acidity and basicity is based on.
- $-log(1.0) = 0$
- $-log(10.0) = -1$
