pH, Hydrogen Ion Concentration Calculator

Select Chemical:
Concentration:
pH:
H+ Concentration:



pH calculation formula:
  pH = -log(1/H+)
Where:
H+: Hydrogen ion concentration in the solution

H+ concentration of acid is depended on its pKa, for strong acid like HCl, its pKa=1, thus H+ concentration of 1 M HCl is also 1 M; for weak acid such as acetic acid, its pKa=0.0000175, thus H+ concentration of 1 M acetic acid is: 1 * 0.0000175 = 0.0000175 M



pKa Table of Common Acids

Name
pKa
Formula
Acetic acid
0.0000175
CH3COOH
arsenic acid
0.006
Ar2O3
arsenious acid
0.0000000006
As2O3
benzoic acid
0.000063
C7H6O2
boric acid
0.00000000064
H3BO3
carbonic acid
0.00000043
H2CO3
citric acid
0.00074
C6H8O7
formic acid
0.000176
CH2O2
hydrocyanic acid
0.00000000072
HCN
hydrofluoric acid
0.00067
HF
hydrosulfuric acid
0.000000091
H2S
hydrochloric acid
1.0
HCl
hypochlorous acid
0.000000011
HClO
perchloric acid
1.0
HClO4
chlorous acid
0.012
HClO2
sulfuric acid
1.0
H2SO4
sulfurous acid
0.013
H2SO3
nitric acid
1.0
HNO3
nitrous acid
0.00051
HNO2
phenol acid
0.00000000011
C6H6O
phenol
0.00000000011
C6H6O
phosphoric acid
0.011
H3PO4
phosphorous acid
0.05
H3PO3
sodium hydroxide
1.0
NaOH
aniline
0.0000000004
C6H5-NH2
ammonia
0.0000175
NH3
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