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pH of Common Inorganic Acids |
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Calculated pH values of common acids for 1, 10, and 100 mmol/L (valid for standard conditions at 25°C, 1 atm)
Acid |
Name |
1 mM |
10 mM |
100 mM |
H2SeO4 |
selenic acid |
2.74 |
1.83 |
0.97 |
H2SO4 |
sulfuric acid |
2.75 |
1.87 |
1.01 |
HI |
hydroiodic acid |
3.01 |
2.04 |
1.08 |
HBr |
hydrobromic acid |
3.01 |
2.04 |
1.08 |
HCl |
hydrochloric acid |
3.01 |
2.04 |
1.08 |
HNO3 |
nitric acid |
3.01 |
2.04 |
1.08 |
H3PO4 |
orthophosphoric acid |
3.06 |
2.26 |
1.63 |
H3AsO4 |
arsenic acid |
3.08 |
2.31 |
1.70 |
H2SeO3 |
selenous acid |
3.15 |
2.47 |
1.90 |
H2CrO4 |
chromic acid |
3.03 |
2.33 |
2.06 |
HF |
hydrofluoric acid |
3.27 |
2.65 |
2.12 |
HNO2 |
nitrous acid |
3.28 |
2.67 |
2.13 |
HCyanate |
isocyanic acid, HOCN |
3.35 |
2.76 |
2.23 |
HFormate |
formic acid, CH2O2 (methanoic acid) |
3.47 |
2.91 |
2.38 |
H2Se |
hydrogen selenide |
3.49 |
2.93 |
2.41 |
H2MoO4 |
molybdic acid |
3.46 |
2.94 |
2.43 |
HLactate |
lactic acid, C3H6O3 (milk acid) |
3.51 |
2.96 |
2.44 |
HAcetate |
acetic acid, C2H4O2 (ethanoic acid) |
3.91 |
3.39 |
2.88 |
H3Citrate |
citric acid, C6H8O7 |
4.18 |
3.90 |
3.57 |
H2CO3 |
carbonic acid |
4.68 |
4.18 |
3.68 |
H2S |
hydrogen sulfide |
4.97 |
4.47 |
3.97 |
H3AsO3 |
arsenious acid |
6.07 |
5.58 |
5.09 |
HCyanide |
hydrocyanic acid, HCN |
6.11 |
5.62 |
5.12 |
H3BO3 |
boric acid |
6.12 |
5.62 |
5.12 |
H4SiO4 |
silicic acid |
6.40 |
5.91 |
5.42 |
H4SiO4 |
silicic acid (with SiO2(a) precipitation) |
6.40 |
6.26 |
6.26 |
[Source: http://www.aqion.de/site/191]
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