Question

Which acid is the strongest? pH = 0.5 pH = 2.0 pH = 3.5 pH = 5

Answer 1

Answer:

The most acidic or strongest acid is with pH equal to 0.5

Explanation:

The pH of the solution is defined as negative logarithm of $H^+$ concentration.

Mathematically can written as:

$pH=-\log[H^+]$

$pH\propto \frac{1}{[H^+]}$

From the above expression we can see that pH of the solution is inversely related to the concentration of the $H^+$ ions.

This means that higher the concentration of $H^+$ ions in the solution higher will be pH and more acidic will be the solution.

So, from the given option the most acidic or strongest acid is with pH equal to 0.5 because the concentration $H^+$ ions is highest in this solution with respect to other solutions.

Answer 2

PH = 0.5 would be the most acidic because the lower it is on the pH scale the more acidic it is.