Question

manganate- anion MnO is bright green; oxide MnO,-insoluble compound of a brown coloring. Write the equations of electron balance, put the coefficients, point out the oxidant and the reductant, the processes of oxidation and LABORATORY WORK N2 Oxidation-Reduction Reactions Objective: experimentally investigate redox process. Experiment 1. (NHCrO, Decomposition reduction: Instructions Put some microspatulas of (NH4) CrO, into a test - tube. Heat the bottom of the test tube for 0.5 minute. Observe the appearance of green flakes of Cr O, and the evolution of N; with water vapor. In the acid medium: How to fix the experimental data 1. Write the cquation of the reaction, Write the electron balance and put the coefficients and point out the oxidation and the reductant. In the neutral medium: in the alkaline medium: Experiment 2. Medium influence on redox process Instructions 1, Take three test tubes. Put 3-4 drops of KMnO, solution into each test-tube 2, Produce a respective medium in each test- tube adding 2-3 drops of H-SO, (pH<7) into the first one: 2-3 drops of distilled water (pH 7) into the second one; 2-3 drops of KOH (pH> 7) solution into the third one. Experiment 3. K.Cr-0, reduction with ethyl alcohol Instructions Put 5-6 drops of K-Cr-O, solution into a test - tube; add 2-3 drops of concentrated sulfuric acid H,SO, with density 1.84 g/ml. Add 4-5 drops of ethyl alcohol C HSOH and observe the change of the coloring and smell the specific odor. 3. Add 2 microspatulas of cristal KNO, into each test- tube and stir up to the full solution of the cristals. 4. Observe the change of the coloring in each test tube. Pay attention to the tube with the alkaline medium as the initial coloring changes very quickly How to fix the experimental data as the result of desproportion. I. Write the cquation of K Cr O, reduction with ethyl alcohol up to acetaldehyde CH COH How to fix the experimental data I. Write the reactions of reduction of KMnO, with KNO; in the acid, neutral and alkaline media. First, consider that under th experimental conditions KNO, is oxidized up to KNO1: second nole that manganese compounds have different coloring due to the oxidation state: permanganate- anion MnO in a diluted solution is pink, but with strengthening of may change up to violet (purple)

Answer 1

ammonfum dichromate s undergoing thermal deonaposition nd paoduces nitaogen, chromium (m) ozide and wateY / N2 + CY203 + 4 H20 A DA P Ok4 Here dich oomium ions 0ridi'ses ammonium ions and pooduce N2 and H20. Choomium toms are reduced foom dichomate to choomium 1 AD C toi0χιda

KMn04 With KNO (Reduction) Here accordina to the medium the oxidation State of Mn changes m auidic medium KM OA has +7 Mn but +7 Mo changes to +2 Mn amd m basic medium it will be +6 Mn A cidic medium CH, S04) 2+ Mn04 + 84t + Se Mn + 4 H20 Basic medium (KOH) 2- MA04 Mola e Neutral medium Cwater): + 3e Ma 0 + 4 ou 2 M20 Mn04 ozidizing effect and reducing acidic medium maximum &KMn04

etfeet will be minimum ouidicing eesfect of educEng 9n basic madium, KMO04 will minimum and be effect will be maximum 2 Cr20 With ethul alcobol 4 K2Ct20 Ib H2 604 4 CH5OH 3 CH3 COOH 4 K2S04 4 2 (504)8 +2C02 + 22H20 wnite OY We com H20 2 [0] - CH3LOOH Cn3 LH20H t Jhis to e's foom an oxygen means agent. Acid is obtained 2 Co] For geting take Co] eaidicing when we use aldehyde cam we Col 50seM2 CHO 26r301 H20