What is the h+ of a solution at ph 3.5

Answer 1

The letter "p" in biology/biochemistry can be confusing. In case of pH and pK, it is -log.

pH = -log [H⁺]

pK = -log K

In case of gases, example, pCO₂, the "p" stands for partial pressure of carbon dioxide.

For this problem:

pH = -log [H⁺]

3.5 = -log [H⁺]

-3.5 = log [H⁺]

[H⁺] = inverse log (or antilog) -3.5

[H⁺]= 3.2 x 10^-4 M. (to two significant figures since 3.5 has two significant figures)

Answer 2

pH = - log [H+]

3.5 = - log [H+]

-3.5 = log [H+]

inverse log = log ^-1

log ^-1 [-3.5] = H+

H+ = 3.16 x 10^-4