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Acid-Base Titration Curves02:23

Acid-Base Titration Curves

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A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid.
For a titration carried out for 25.00 mL of...
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Third Law of Thermodynamics02:38

Third Law of Thermodynamics

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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
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Second Law of Thermodynamics02:49

Second Law of Thermodynamics

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In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
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Second Law of Thermodynamics00:53

Second Law of Thermodynamics

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The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the...
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Titration Calculations: Weak Acid - Strong Base03:55

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Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.1K
Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

33.8K
Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
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Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction
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Protein⁻Polyelectrolyte Interaction: Thermodynamic Analysis Based on the Titration Method †.

Xiaohan Wang1, Kai Zheng2, Yi Si3

  • 1State-Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China. ellery9381@foxmail.com.

Polymers
|April 10, 2019
PubMed
Summary

This review explores protein-polyelectrolyte (PE) interactions, focusing on titration techniques like turbidimetric titration and isothermal titration calorimetry (ITC) to understand binding mechanisms and guide applications.

Keywords:
complexationelectrostaticsisothermal titration calorimetrypolyelectrolytethermodynamic analysis

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Area of Science:

  • Biochemistry and Materials Science
  • Focus on molecular interactions and their applications.

Background:

  • Protein-polyelectrolyte (PE) interactions are crucial in various applications.
  • Understanding these interactions is key for designing effective biomedical systems.

Purpose of the Study:

  • To review mechanisms, theories, and binding stages of protein-PE interactions.
  • To highlight the application of titration techniques in studying these interactions.
  • To summarize recent findings on protein-linear PE and protein-PE nanoparticle interactions.

Main Methods:

  • Utilized turbidimetric titration and isothermal titration calorimetry (ITC).
  • These techniques provide thermodynamic data (pHc, pHφ, binding constant, entropy, enthalpy).

Main Results:

  • Titration techniques elucidate binding affinity, stoichiometry, and driving forces.
  • Systematic comparison of binding differences between linear PEs and PE-modified nanoparticles.
  • Detailed discussion of protein-PE binding based on titration data.

Conclusions:

  • Protein-PE interactions are complex, involving various binding stages and mechanisms.
  • Titration techniques are powerful tools for characterizing protein-PE binding.
  • Insights gained can optimize the design of biomedical PE-based systems.