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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
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Acid-Base Balance01:25

Acid-Base Balance

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The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
When the pH of arterial blood rises above 7.45, it results in a condition called alkalosis. Conversely, a drop below 7.35 leads to...
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Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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Buffers: Overview01:30

Buffers: Overview

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Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
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Acids, Bases and Neutralization Reactions01:27

Acids, Bases and Neutralization Reactions

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Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
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Mixtures of Acids01:19

Mixtures of Acids

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The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
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Natural acidified marine systems: Lessons and predictions.

José Carlos Hernández1, Sara González-Delgado1, M Aliende-Hernández1

  • 1Observatorio Marino de Cambio Climático - Punta de Fuencaliente, La Palma Island, Marine Community Ecology and Conservation, Dpto. Biología Animal, Edafología y Geología, Universidad de La Laguna, Tenerife, Canary Islands, Spain.

Advances in Marine Biology
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PubMed
Summary
This summary is machine-generated.

Natural acidified marine systems (ASs) offer insights into ocean acidification (OA) effects. Research shows similar ecological impacts, like species loss, across 23 global sites, highlighting the need for conservation and data sharing.

Keywords:
CO(2) seepCO(2) ventNetworkOcean acidificationVolcanismpH fluctuation

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Area of Science:

  • Marine Biology
  • Oceanography
  • Ecology

Background:

  • Natural acidified systems (ASs) exhibit low pH due to geological and biological factors.
  • These environments serve as natural laboratories for studying long-term ecological and evolutionary responses to ocean acidification (OA).
  • Understanding ASs is vital for predicting the impacts of anthropogenic OA on marine ecosystems.

Purpose of the Study:

  • To analyze the ecological and evolutionary responses in natural acidified marine systems.
  • To identify common patterns and impacts of ocean acidification across different ASs globally.
  • To inform future research and conservation strategies for vulnerable marine environments.

Main Methods:

  • Comparative analysis of scientific research from 23 natural acidified systems worldwide.
  • Observation of ecological and biological responses under naturally low pH conditions.
  • Assessment of species' functional roles and the prevalence of calcareous organisms.

Main Results:

  • Significant parallelisms observed in research results across global ASs.
  • Disappearance of calcareous organisms and loss of ecologically vital species under OA conditions.
  • Identification of key ecological functions affected by reduced pH.

Conclusions:

  • Natural acidified systems provide critical data on ocean acidification impacts.
  • Continuous international collaboration and open data access are essential for future research.
  • Preservation of ASs as heritage sites using non-destructive methods is imperative.