Presentation Topic “Potassium permanganate and Potassium dichromate is an excellent tool in analysis” www.AssignmentPoint.com

KMnO₄ & K₂Cr₂O₇ Potassium permanganate and potassium dichromate are very essential for titration of various types of chemical products. These are oxidizing agents which are used in many analytical process such as Redox-titration. www.AssignmentPoint.com

How involves in Redox Titration? Permanganometry & Dichrometry are most significant techniques used in qualitative analysis in Chemistry. It is a redox titration and involves the use of permanganates & dichromates which are used to estimate the amount of analyte present in unknown chemical samples. www.AssignmentPoint.com

Justification between KMnO₄ & K₂Cr₂O₇ : KMnO₄: The major application of KMnO4 is as a reagent for the synthesis of organic compounds. Significant amounts are required for the synthesis of ascorbic acid, chloramphenicol, saccharin, isonicotinic acid, and pyrazinoic acid. K₂Cr₂O₇: It can be used to test for sulfur dioxide, as it turns distinctively from orange to green. www.AssignmentPoint.com

KMnO₄ in different medium Strongly alkaline medium            MnO4¯    +  e-    →    MnO42-                                               (Permanganate ion)        (Manganate ion)   Neutral medium           MnO4¯     +  2H2O    +    3e--    →     MnO2↓   +   4OH-                         (Manganese dioxide ppt)          Acidic medium         MnO4¯    +  8H+  +   5e-     →         Mn2+      +    4H2O                                                                  (Manganous ion)       www.AssignmentPoint.com

K₂Cr₂O₇ in Acidic medium: Potassium dichromate acts as oxidizing agent in acidic medium only. Cr2O72– + 14H+ + 6e– → 2Cr3+ + 7H2O                          www.AssignmentPoint.com

Justification KMnO₄ is not a secondary standard. It is not easily obtained in perfectly pure form which is completely free from manganese dioxide. K₂Cr₂O₇ is an excellent primary standard and available in high purity. Its aqueous solutions are not attacked by oxidisable impurities like rubber or any other organic matter. www.AssignmentPoint.com

Advantages of KMnO₄ & K₂Cr₂O₇ Advantage of KMnO₄: Low cost. Having specific color. Act as self indicator. Titration can be perform in both acidic and basic media. Advantage of K₂Cr₂O₇: Easily can be prepared. Primary standard solution Instantly can use. Light can not do any harm. www.AssignmentPoint.com

Why this two compound considered as an excellent tool in analysis? Potassium permanganate and potassium dichromate are widely using almost every sectors of analysis. As they are oxidizing agent they are greatly using in different types of titration. Safety handling and proper use of these reagent can ensure a perfect result. www.AssignmentPoint.com

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