كيمياء تحليلية Question

[blnd]

السلام عليكم ورحمة الله وبركاته

I want to prepare 2,4dinitrophenyl hydrazine solution, but I donot know how prepare it (in what solvent) for determination in analytical chemistry​

جزاكم الله خيرا​

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[mann1]

وعليكم السلام ورحمة الله وبركاته​

I think you want to prepare (Brady's reagent) to run a test for Aldehyde and Ketones, so, here's the procedure​

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Dissolve 0.03 g of 2,4-dinitrophenylhydrazine in 40 ml of methanol containing 0.3 ml of concentrated hydrochloric acid and dilute to the mark in a 50-ml one-mark volumetric flask with the methanol. You can use conc. Sulphuric acid instead of HCl. Prepare this solution fresh each day​

Good Luck​

 

[blnd]

I want to prepare azo dye(coupling reaction​

 

[mann1]

I want to prepare azo dye(coupling reaction​

Well, if you asking about the SOLVENT , you can use Methanol or Ethanol but make sure 1st that the other reactants dissolves in them, generally use 2 drops of conc. Sulphuric acid as a catalyst for the coupling reaction​

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the attached file may help, pages (22-25) and the tables​

 

[blnd]

اشكروك جزيل الشكر يا mann1، الله طول عمرك على الاعمال الخير.