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Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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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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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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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
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Addressing the Carbonate Issue: Electrocatalysts for Acidic CO2 Reduction Reaction.

Weixing Wu1, Liangpang Xu1, Qian Lu1

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Advanced Materials (Deerfield Beach, Fla.)
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PubMed
Summary
This summary is machine-generated.

Electrochemical carbon dioxide reduction in acidic electrolytes overcomes carbonate byproduct issues. This review details advancements in catalysts and devices for efficient CO2 conversion, crucial for renewable energy applications.

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acidic CO2 reduction reactioncharacterizationdeviceelectrocatalystsenergy conversionmechanism

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Renewable Energy

Background:

  • Electrochemical CO2 reduction (CO2RR) is vital for CO2 conversion using renewable energy.
  • Neutral/alkaline electrolytes form carbonate byproducts, hindering device-level CO2RR.
  • Acidic electrolytes offer a solution to the carbonate issue but face challenges from hydrogen evolution.

Purpose of the Study:

  • To review recent developments in acidic CO2RR.
  • To elucidate reaction mechanisms and guide catalyst design.
  • To summarize progress in device engineering for high-performance acidic CO2RR systems.

Main Methods:

  • Mechanistic understanding of acidic CO2RR pathways.
  • Analysis of heterogeneous catalysts, immobilized molecular catalysts, and surface-enhanced catalysts.
  • Summary of device-level applications and engineering strategies.

Main Results:

  • Acidic CO2RR presents a viable alternative to overcome carbonate limitations.
  • Advanced catalyst designs (heterogeneous, molecular, surface-enhanced) show promise.
  • Progress in device engineering is crucial for practical implementation.

Conclusions:

  • Acidic CO2RR is a promising strategy for efficient CO2 utilization.
  • Further research is needed to enhance catalyst selectivity, activity, stability, and scalability.
  • Continued efforts in catalyst and device design are essential for widespread adoption.