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Aqueous Solutions and Heats of Hydration

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Solubility Equilibria: Ionic Product of Water01:16

Solubility Equilibria: Ionic Product of Water

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Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Hydrated Ionic Liquids: Perspective for Bioscience.

Kyoko Fujita1, Hiroyuki Ohno2

  • 1Department of Pathophysiology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan.

Chemical Record (New York, N.Y.)
|February 6, 2023
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Summary
This summary is machine-generated.

Hydrated ionic liquids (ILs) are tunable aqueous solutions with properties controlled by water content. These unique IL-water mixtures offer promising environments for biomolecules, mimicking cellular conditions.

Keywords:
bound waterhydrationhydrogen bondprotein renaturationwater activity

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Area of Science:

  • Chemistry
  • Materials Science
  • Biophysics

Background:

  • Ionic liquids (ILs) are salts that are liquid at low temperatures.
  • Hydrated ILs are mixtures of ILs with controlled water content.
  • Water molecules in hydrated ILs strongly interact with ions, influencing solution properties.

Purpose of the Study:

  • To survey the fundamental properties of hydrated ionic liquids.
  • To review recent research findings on hydrated ILs.
  • To discuss future research directions for hydrated ILs.

Main Methods:

  • Literature review of hydrated ionic liquid properties.
  • Analysis of water content effects on IL characteristics.
  • Exploration of IL-water interactions.

Main Results:

  • Properties like polarity, viscosity, and ion mobility are tunable via water content.
  • Hydrated ILs can create environments similar to living cells.
  • These solutions show potential as effective biomolecule solvents.

Conclusions:

  • Hydrated ILs offer a versatile platform for designing aqueous electrolyte solutions.
  • Their tunable nature makes them suitable for biomolecular applications.
  • Further research is warranted to fully explore their potential.