Video Experimental Relacionado
Updated: Mar 6, 2026
08:23
Seawater Sampling and Collection
Published on: June 17, 2009
20.9K
La historia geológica del pH del agua de mar
1Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel. itay.halevy@weizmann.ac.il.
Science (New York, N.Y.)
|March 11, 2017
Resumen
El pH del océano de la Tierra ha aumentado gradualmente a lo largo del tiempo geológico, desde los primeros niveles arcaicos de 6.5-7.0 hasta los niveles fanerozoicos de 7.5-9.0. Este cambio de pH impactó la vida temprana y el clima.
Área de la Ciencia:
- Geoquímica
- La oceanografía
- Paleoclimatología
Sus antecedentes:
- El pH del océano es crucial para comprender la biogeoquímica del agua de mar.
- La historia geológica a largo plazo del pH del océano no se entiende bien.
Objetivo del estudio:
- Para reconstruir la historia geológica del pH del agua de mar.
- Investigar los factores que controlan los cambios de pH del océano a largo plazo.
Principales métodos:
- Reconstrucción del pH del agua de mar mediante el análisis de los ciclos de los principales componentes del agua de mar.
- Contabilidad de los cambios en el pCO2 atmosférico y el intercambio hidrotermal.
Principales resultados:
- El pH del océano Arcaico temprano estaba entre 6.5 y 7.0.
- El pH del océano Fanerozoico osciló entre 7,5 y 9,0.
- El pH del océano aumentó debido a la disminución del pCO2 atmosférico y la reducción del intercambio hidrotermal.
Conclusiones:
- Las primeras condiciones de pH del océano pueden haber influido en el origen de la vida y los primeros metabolismos.
- Los cambios en el pH del océano afectaron el clima de la Tierra a través de la partición de CO2.
Más Videos Relacionados
09:45Laboratory Simulation of an IronII-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
Published on: July 24, 2016
12.3K
10:43Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
Published on: November 5, 2014
26.4K
Videos de Conceptos Relacionados
01:22Effect of Sea Water on Concrete
1.2K
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
Concrete in areas between tide marks,...
1.2K
02:35What is Evolutionary History?
44.1K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
44.1K
02:41pH Scale
81.5K
Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
81.5K
01:24pH
147.2K
The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
147.2K
04:08Determining the pH of Salt Solutions
48.8K
The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
48.8K
01:19Quality of Water
623
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
623