okay love youAcidified potassium manganate(VII) is a strong oxidising agent so it can be used to oxidise substances. If a reaction occurs a colour change will be seen. Potassium manganate(VII) is deep purple and when it is reduced‚ it becomes colourless. Let’s take a look at some reactions involving acidified potassium manganate(VII). If a solution of potassium manganate(VII) is placed in a test tube and a light green solution of iron(II) chloride is added to the test tube‚ the purple colour of
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Colour Shoe Polish To make a neutral-colour‚ home-made shoe polish‚ you would need: Soap flakes 30 g (1 oz) Potassium carbonate 15 g (0.5 oz) (Obtain from chemist/pharmacist) Beeswax 150 g (5oz) Gum arabic powder 15 g (0.5 oz) Icing sugar 45 g (1.5 oz) Slice the beeswax and add to 568 ml (a pint) of water. Stir in the soap flakes and potassium carbonate. Boil until a smooth paste. Whilst the mixture is still hot (turn off the heat‚ but act quickly)‚ add and stir the
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stirring‚ 30 mL of sulfuric acid to about 1020 mL of water‚ allow to cool to 25‚ and determine the normality by titration against tromethamine as described under Hydrochloric Acid‚ Normal (1 N). Potassium Permanganate‚ Tenth-Normal (0.1 N) KMnO4‚ 158.03 3.161 g in 1000 mL Dissolve about 3.3 g of potassium permanganate in 1000 mL of water in a flask‚ and boil the solution for about 15 minutes. Insert the stopper in the flask‚ allow it to stand for at least 2 days‚ and filter through a fine-porosity
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in non-polar solvents by mixing polar and non-polar solutions in test tubes. Material: • Lab coats and safety spectacles • A fume cupboard • Heptane • Water • Potassium Permanganate • Iodine • 2 test tubes • 4 small flasks Method: (Wear safety specs and lab coats) • Prepare 4 small flasks containing: • A Heptane • B A weak solution of potassium permanganate‚ made by putting a few crystals of KMnO4 in 100 ml of water. Dilute this with more water until it is the same colour as D • C Water • D Iodine in
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formation of a white ring around the glass closer to the side of the heavier substance (HCl‚ M = 36.4611 g/mole; dAve = 10.8 cm). The agar-water gel set up was composed of a petri dish of agar-water gel containing three wells. Drops of potassium permanganate (KMnO4)‚ potassium dichromate (K2Cr2O7) and methylene blue were simultaneously introduced to each well. Methylene blue‚ having the largest molecular weight‚ displayed the smallest diameter (18 mm) and diffused at the slowest rate (0.3668 mm/min.). Thus
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SAMPLE (WINKLER METHOD) INTRODUCTION In an alkaline solution‚ dissolved oxygen will oxidize manganese(II) to the trivalent state. 8OH-(aq) + 4Mn2+(aq) + 2H2O(l) －－＞ 4Mn(OH)3(s) The analysis is completed by titrating the iodine produced from potassium iodide by manganese(III) hydroxide. 2Mn(OH)3(s) + 2I-(aq) + 6 H+(aq) －－＞ 2Mn2+(aq) + I2(aq) + 6H2O(l) Sodium thiosulphate is used as the titrant. Success of the method is critically dependent upon the manner in which the sample is manipulated
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which diffused at a faster rate of 24.8 cm and formed a white smoke near the HCl end that had the molecular weight of 36 g/mole. The water agar-gel setup was made up of a petri dish containing the gel with three wells. Drops of potassium permanganate (KMnO4)‚ potassium dichromate(K2Cr2O7) and methylene Blue were concurrently placed in the wells. Methylene Blue had the smallest diameter which diffused at the slowest Rate of 0.13 mm/min since it has the largest molecular Weight. Thus‚ the larger
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diffusion rates of Potassium permanganate (KMnO4)‚ Potassium dichromate(K2Cr2O7) and Methylene Blue^1 _________________ Group 3 Sec. X-1L February 6‚ 2012 ____________________ ABSTRACT The effect of molecular weight on the diffusion of substances were tested through the use of agar-water gel with three wells placed in a petri dish. Drops of three different substances namely: Potassium permanganate (KMnO4)‚ Potassium dichromate
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concentration of the ferrous solution. Materials: - .020M potassium permanganate solution - Mohr’s salt solution (concentration unknown) - 6.0 M H2SO4 - 10- mL volumetric pipet - Pipet bulb - Beakers Procdure: Get 40 mL of standardized Potassium Permanganate and Mohr’s Salt solutions. Rinse the burets‚ and record the initial volumes. Measure 10mL of Mohr’s Salt solution. Add 10 mL of H2SO4 solution. Begin titrating with the Potassium Permanganate until the endpoint is reached. Record the final
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a redox titration and then compared to a different method. A primary standard which in this case is ferrous ammonium sulfate will be used to standardize potassium dichromate. The standardized potassium dichromate will then be used to titrate the unknown iron sample using the indicator p-diphenylamine sulfonate. The standardized potassium dichromate which has a concentration around 0.017 M is then titrated into the unknown iron sample which is dissolved in deionized water. The unknown sample
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