Hydrogen ion

 ( Ocean Acidification ) 

A hydrogen ion is created when a hydrogen atom loses an electron. A positively charged hydrogen ion (or proton) can readily combine with other particles and therefore is only seen isolated when it is in a gaseous state or a nearly particle-free space. Due to its extremely high Charge density of approximately 2×10¹⁰ times that of a sodium ion, the bare hydrogen ion cannot exist freely in solution as it readily hydrates, i.e., bonds quickly.due to its extremely high charge density of approximately 2×10¹⁰ times that of a sodium ion The hydrogen ion is recommended by IUPAC as a general term for all of hydrogen and its . Compendium of Chemical Terminology, 2nd edition McNaught, A.D. and Wilkinson, A. Blackwell Science, 1997 , also online Depending on the electric charge of the ion, two different classes can be distinguished: positively charged ions and negatively charged ions.

---

Cation (positively charged) A hydrogen atom is made up of a nucleus with charge +1, and a single electron. Therefore, the only positively charged ion possible has charge +1. It is noted H⁺.

Depending on the isotope in question, the hydrogen cation has different names:

• Hydron: general name referring to the positive ion of any hydrogen isotope (H⁺)
• Proton: ¹H⁺ (i.e. the cation of Hydrogen atom)
• Deuteron: ²H⁺, D⁺
• Triton: ³H⁺, T⁺

In addition, the ions produced by the reaction of these cations with water as well as their hydrates are called hydrogen ions:

• Hydronium ion: H₃O⁺
• Zundel cation: H₅O₂⁺ (named for Georg Zundel)
• Eigen cation: H₉O₄⁺ (or HO •3HO) (named for Manfred Eigen)

Zundel cations and Eigen cations play an important role in proton diffusion according to the Grotthuss mechanism.

In connection with acids, "hydrogen ions" typically refers to hydrons.

the image at left the hydrogen atom (center) contains a single proton and a single electron. Removal of the electron gives a cation (left), whereas addition of an electron gives an anion (right). The hydrogen anion, with its loosely held two-electron cloud, has a larger radius than the neutral atom, which in turn is much larger than the bare proton of the cation. Hydrogen forms the only cation that has no electrons, but even cations that (unlike hydrogen) still retain one or more electrons are still smaller than the neutral atoms or molecules from which they are derived.

---

Anion (negatively charged) Hydrogen are formed when additional electrons are acquired:

• Hydride: general name referring to the negative ion of any hydrogen isotope (H⁻)
• Protide: ¹H⁻
• Deuteride: ²H⁻, D ⁻
• Tritide: ³H⁻, T ⁻

---

Uses Hydrogen ions drive ATP synthase in photosynthesis. This happens when hydrogen ions get pushed across the membrane creating a high concentration inside the thylakoid membrane and a low concentration in the cytoplasm. However, because of osmosis, the H⁺ will force itself out of the membrane through ATP synthase. Using their kinetic energy to escape, the protons will spin the ATP synthase which in turn will create ATP. This happens in cellular respiration as well though the concentrated membrane will instead be the inner membrane of the mitochondria.

Hydrogen ions concentration, measured as pH, is also responsible for the acidic or basic nature of a compound. Water molecules split to form H⁺ and hydroxide anions. This process is referred to as the self-ionization of water.

---

Ocean acidification The concentration of hydrogen ions and pH are inversely proportional; in an aqueous solution, an increased concentration of hydrogen ions yields a low pH, and subsequently, an acidic product. By definition, an acid is an ion or molecule that can donate a proton, and when introduced to a solution it will react with water molecules (H₂O) to form a hydronium ion (H₃O⁺), a conjugate acid of water.OpenStax, Chemistry. OpenStax CNX. Jun 20, 2016 http://cnx.org/contents/85abf193-2bd2-4908-8563-90b8a7ac8df6@9.311. For simplistic reasoning, the hydrogen ion (H⁺) is often used to abbreviate the hydronium ion.

Ocean acidification is the direct consequence of elevated concentrations of hydrogen ions and carbonate saturation from significant absorption of carbon dioxide (CO₂) by the world's oceans.W.S. Broecker, T. Takahashi (1997) Neutralization of fossil fuel CO₂ by marine calcium carbonate The pre-industrial state of the ocean's carbonate chemistry has been notably stable, including the balance of its pH.P.N. Pearson, M.R. Palmer (2000) Atmospheric carbon dioxide concentrations over the past 60 million years Nature, 406, pp. 695-699 Following the industrial revolution, anthropogenic emissions of burning fossil fuels, cement production, and changes in land use, have increased the oceans uptake of carbon dioxide from the atmosphere by 30%.C.L. Sabine, et al. (2004). The oceanic sink for anthropogenic CO₂ Science, 305 (5682), pp. 367-371 In the ocean, the /ref> the ocean acts as the largest carbon sink on the planet, playing a significant role in climate regulation.Ben I. Mcneil & Richard J. Matear (2007). Climate change feedbacks on future oceanic acidification, Tellus B: Chemical and Physical Meteorology, 59:2, 191-198 In addition to carbon fluxes, the natural process of carbon sequestration from the atmosphere into the deep ocean is facilitated by two systems, the biological pump and the solubility pump. The solubility pump is a physico-chemical process that transfers CO₂ at the air-sea interface.Hessen, D., Ågren, G., Anderson, T., Elser, J., & De Ruiter, P. (2004). Carbon Sequestration in Ecosystems: The Role of Stoichiometry. Ecology, 85(5), 1179-1192. Retrieved November 22, 2020, from http://www.jstor.org/stable/3450161 Based on Henry's Law, the amount of dissolved CO₂ in an aqueous solution is directly proportional to the partial pressure of CO₂ in the atmosphere.Avishay DM, Tenny KM. Henry' /ref> To maintain equilibrium, a state of high atmospheric partial pressure of CO₂ leads to an increased oceanic exchange of this gas by molecular diffusion.

In the surface waters, dissolved atmospheric carbon dioxide (CO_2(aq)) reacts with water molecules to form carbonic acid (H₂CO₃), a weak diprotic acid. Diprotic acids consist of two ionizable hydrogen atoms in each molecule.OpenStax, Chemistry. OpenStax CNX. Jun 20, 2016 http://cnx.org/contents/85abf193-2bd2-4908-8563-90b8a7ac8df6@9.311. In an aqueous solution, partial dissociation of carbonic acid releases a hydrogen proton (H⁺) and a bicarbonate ion (HCO₃⁻), and subsequently, the bicarbonate ion dissociates into an additional hydrogen proton and a carbonate ion (CO₃^2-).OpenStax, Chemistry. OpenStax CNX. Jun 20, 2016 http://cnx.org/contents/85abf193-2bd2-4908-8563-90b8a7ac8df6@9.311. The dissolving and dissociating of these inorganic carbon species generate an increase in the concentration of hydrogen ions and inversely lowers ambient surface ocean pH. The carbonate buffering system governs the acidity of seawater by maintaining dissolved inorganic carbon species in chemical equilibrium.

/ref> However, increasing atmospheric CO₂ concentrations may exceed the buffering capacity threshold, consequently resulting in higher rates of ocean acidification. Shifts in the ocean's carbonate chemistry has the potential to manipulate ocean biogeochemical cycles for many elements and compounds causing profound impacts on marine ecosystems. Furthermore, the solubility of CO₂ is temperature dependent; elevated surface water temperatures reduce CO₂ solubility. A continual rise in atmospheric partial pressure of CO₂ could potentially convert the ocean from acting as sink (the vertical transport of carbon to the depths of the ocean) to becoming a source (CO₂ degassing from the ocean), further increasing global temperatures.Matsumoto, K. (2007). Biology-mediated temperature control on atmosphericpCO2and ocean biogeochemistry. Geophysical Research Letters, 34(20). doi:10.1029/2007gl031301

---

See also

• Acid
• Protonation
• Dihydrogen cation
• Trihydrogen cation

Post Comment