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Conductometric Titrations: Strong Acid-Base and Weak Acid-Base Titrations01:29

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In acid-base titrations, conductance measurements are utilized to detect the endpoint. This method is grounded on the fact that electrical conductance relies on the number and mobility of ions. For instance, consider titrating strong acid HCl with a strong NaOH base. Initially, the HCl in the conductivity vessel conducts electricity due to the presence of hydrogen ions and chloride ions. As NaOH is gradually added from the burette, the fast-moving hydrogen ions are replaced by slower-moving...
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When a weak acid such as acetic acid is titrated against a strong base like sodium hydroxide, the initial conductance is relatively low due to the weak dissociation of acetic acid. However, as sodium hydroxide is added to the solution, it reacts with the acetic acid to produce highly ionized sodium acetate, which causes an increase in conductance. Once all the acetic acid has been neutralized, any additional sodium hydroxide introduces fast-moving hydroxyl ions, leading to a sharper increase in...
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In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...
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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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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.
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An acid-base titration is a technique used to determine the concentration of an unknown acid or base, using a titrant of known concentration–either a base for acid titration or an acid for base titration. The process involves gradually adding the titrant, leading to a predictable change in the pH of the solution. This change is plotted on a titration curve, showing how a solution's pH varies with the amount of titrant added. Such curves are instrumental in monitoring the...
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Supercapacitive swing adsorption (SSA) captures carbon dioxide (CO2) by proton adsorption to negative electrodes. This ionic liquid-solid mechanism explains CO2 sorption during the charging process in SSA systems.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Engineering

Background:

  • Supercapacitive swing adsorption (SSA) is an emerging technology for carbon capture.
  • Understanding the fundamental mechanism of CO2 sorption in SSA is crucial for optimizing performance.
  • Activated carbon electrodes are commonly used in SSA devices.

Purpose of the Study:

  • To elucidate the mechanism of CO2 sorption in supercapacitive swing adsorption.
  • To investigate the role of electrode charge and CO2 interaction with activated carbon.
  • To provide evidence for the ionic liquid-solid mechanism in SSA.

Main Methods:

  • pH measurements and acid-base titrations of water-extracted activated carbon electrodes.
  • Experiments conducted at varying voltage windows (0-0.5 V to 0-1.4 V).
  • Utilized 15% CO2/85% N2 mixtures and pure N2 as feed gases.

Main Results:

  • Negatively charged electrodes showed a pH increase upon CO2 exposure, consuming more acid titrant.
  • Positively charged electrodes consumed more base titrant when only N2 was present.
  • Increased voltage windows correlated with higher pH values and titrant consumption, indicating enhanced CO2 interaction.

Conclusions:

  • CO2 adsorption occurs at the negative electrode, while desorption happens at the positive electrode during charging.
  • The findings support an ionic liquid-solid mechanism driven by selective proton adsorption.
  • This mechanism explains CO2 sorption in SSA systems based on electrode charge interactions.