Why should pH determination be done in aqueous solutions?
Answers
Answer:
As a measure of acidity or basicity of an aqueous solution, pH is an excellent tool. When used in combination with titration, it is a simple means to monitor bath concentration and/or soil loading potential.
Explanation:
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Because the proton activity phrase is relevant to organic medium as well as water, the pH idea may be used to non-aqueous solutions. Many polar solvents, such as DMSO, DMF, and aqueous acetone, are compatible with the glass electrode (up to 80 percent of acetone). In this scenario, the standard state you use to calculate proton activity is critical. When common aqueous buffer solutions are used to calibrate pH metres, the resultant pH for non-aqueous media is referred to as the instrumental value.
The energy of proton transfer from infinitely diluted aqueous solution to the same non aqueous solution must be corrected for junction potential (diffusion potential occurring between aqueous filling of reference electrode and outer organic solution) and proton transfer from infinitely diluted aqueous solution to the same non aqueous solution. For a wide variety of organic and mixed solvents, both forms of correction values are known in the literature. You may acquire so-called pa (H+) values, which are proton activities referring to an infinitely diluted solution in a specific solvent as the standard state, using this method.