User:Soulzqm/Diprotic acid
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In chemistry, diprotic acid is a class of acids capable of donating two proton or hydrogen atom per molecule when dissociating in an aqueous solution.[1][2]
General Structure
There are both organic (which is called dicarboxylic acids) and inorganic diprotic acids. Chromic acid (H2CrO4) and sulfuric acid (H2SO4) are common and widely-used inorganic acids. They have similar structures with two -OH groups which are able to donate two H+ ions linked to the center atom.[3] Some other inorganic diprotic acids such as hydrosulfuric acid (H2S) usually have two hydrogen atoms linked to a electronegative center.[4] Diprotic carbonxylic acids have general molecular formula HO2C-R-CO2H.[5]
Dissociation and equilibrium
The dissociation of a diprotic acid does not happen all at once due to the two stages of dissociation having different Ka values. Hence, each kind of diprtotic acid has two different equilibrium constants,Ka1 and Ka2,
pH calculation
References
- ^ "Diprotic Acid Definition". About.com Education. Retrieved 2016-01-22.
- ^ "What is a Diprotic Acid?". wiseGEEK. Retrieved 2016-01-23.
- ^ Kuczkowski, Robert L.; Suenram, R. D.; Lovas, Frank J. "Microwave spectrum, structure, and dipole moment of sulfuric acid". Journal of the American Chemical Society. 103 (10): 2561–2566. doi:10.1021/ja00400a013.
- ^ "CHEMINFO: Hydrogen sulfide". www.ccohs.ca. Retrieved 2016-01-23.
- ^ L., Leiserowitz,; IUCr (1976-03-15). "Molecular packing modes. Carboxylic acids". scripts.iucr.org. doi:10.1107/S0567740876003968. Retrieved 2016-01-23.
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