Question

What is the ph of a very acidic solution?

Answer 1

Answer:  

pH = -1

Explanation:

A solution of 10 mol·L⁻¹ HCl is very acidic.

HCl is a strong acid, so it dissociates completely in water and

$[\text{H}_{3}\text{O}^{+}] = \text{10 mol/L}$

To get the pH, you take the negative logarithm of the hydronium ion concentration.  

$\text{pH} = -\log{(10)} = -1$

So, a pH = -1 represents a very acidic solution.