Question

Based on the definition of logarithms, what is the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3?

Answer 1

Based on the definition of logarithms, the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3:
A) A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3. 

At pH= 2, [H+] = 0.01 M 
At pH =3, [H+] = 0.001 M

Answer 2

Answer: A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxide ion concentration.

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

$pOH=-log{OH^-}$

$pH+pOH=14$

Given: pH=2

$2=-log[H^+]$

$[H^+]=10^{-2}M$

pH=3

$3=-log[H^+]$

$[H^+]=10^{-3}M$

A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.