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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Titration of Polyprotic Acids with a Strong Base01:23

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Titration of a polyprotic acid, which contains multiple ionizable protons, involves distinct dissociation steps, each with its own dissociation constant (Ka). Each successive Ka is weaker than the previous one. In the titration of a polyprotic acid like sulfurous acid with a strong base such as sodium hydroxide, the base first neutralizes the initial ionizable proton, forming an intermediate species (e.g., hydrogen sulfite ions). This step's titration curve resembles that of a weak...
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Titration of a Strong Acid with a Strong Base01:23

Titration of a Strong Acid with a Strong Base

5.9K
During the titration of a strong acid with a strong base, pH calculations are primarily based on the concentration of residual hydronium or hydroxide ions. Initially, a strong acid like hydrochloric acid fully dissociates, creating hydronium and chloride ions, resulting in a low pH. The addition of a strong base like sodium hydroxide alters the concentration of hydronium ions by neutralizing them. As more base is added, the pH gradually increases. At the equivalence point, all hydronium ions...
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Polyprotic Acids

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Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
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Solvating Effects02:12

Solvating Effects

7.5K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

31.9K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
31.9K

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Counterion-Mediated Hydrogen Bonding Making Poly(styrenesulfonate)-Based Strong Polyelectrolytes pH-Responsive.

Yue Huang1, Xiaoxuan Zheng2, Shuji Ye3,4

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Counterion-mediated hydrogen bonding makes poly(styrenesulfonate) (PSS) brushes pH-responsive. This discovery unlocks new applications for PSS-based strong polyelectrolytes in smart materials.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Physical Chemistry

Background:

  • Poly(styrenesulfonate) (PSS) is a strong polyelectrolyte typically exhibiting pH insensitivity.
  • This lack of pH responsiveness has limited the use of PSS in advanced smart material applications.
  • Understanding the fundamental properties of PSS is crucial for developing novel functional materials.

Purpose of the Study:

  • To investigate the pH-responsive behavior of PSS brushes.
  • To elucidate the mechanism behind this pH responsiveness.
  • To explore the potential of PSS in pH-sensitive smart materials.

Main Methods:

  • Utilizing counterion-mediated hydrogen bonding (CMHB) as a mechanism.
  • Analyzing the structural changes in PSS brushes at the microscale with decreasing pH.
  • Investigating the impact of pH on physicochemical properties like hydration, stiffness, wettability, and adhesion.

Main Results:

  • Demonstrated that CMHB induces pH responsiveness in PSS brushes.
  • Observed increased hydrogen bonding between hydronium counterions and sulfonate groups as pH decreases.
  • Reported a more ordered PSS brush structure and larger sulfonate tilt angles at lower pH.
  • Confirmed pH-induced changes in hydration, stiffness, wettability, and adhesion.

Conclusions:

  • Established a clear structure-property relationship for pH-responsive PSS brushes.
  • Provided new fundamental insights into PSS brush properties.
  • Significantly expanded the application potential of PSS-based strong polyelectrolytes in smart materials.