adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction: BrO3- + 5 Br- + 6 H+ 3 Br2 + 3 H2O IO3- + 5 I- + 6 H+ 3 I2 + 3 H2O Sodium thiosulfate solutions can be standardized by direct titration of the I2 generated in in the KIO3 reaction using the starch-iodine complex as the indicator (remember that the iodine is actually in the form of the triiodide ions in the presence of excess KI due to the I2 + I- I3-‚ equilibrium
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18 mm X 150 mm test tube rack * Pipette Procedure: 1. Place the 4 solutions in separate test tubes with about 2.5 mL in each. (NaF‚ NaCl‚ KBr‚ KI) Use a dropper or you can use a pipette. Add 1 Ml ( 20 drops) of 0.5 M Ca ( NO3h) to each test tubes. Observe
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OF DISSOLVED OXYGEN CONTENT BY WINKLER REDOX TITRATION A. Standardization of Thiosulfate Solution Primary Standard used: KIO3 Formula Mass of Primary Standard: 214.0010 g/mol %Purity: 99.9% Formula Mass of KI: 166.00277 g/mol %Purity of KI: 99.9% Trial 1 2 3 KIO3 weight‚ g 0.1459 0.1458 0.1459 KI weight‚ g 1.0033 0.9857 1.0100 Volume of Na2S2O3‚ ml Final Volume‚ ml 22.6 25.5 22.9 Initial Volume‚ ml 0.0 0.0 0.0 Net volume‚ ml 22.6 25.5 22.9 B. Sample Analysis Volume of Sample: 400 ml Volume of sample
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39. The Viscosity of Liquids After studying the present lecture‚ you will be able to Define viscosity and viscosity coefficient Outline the method to measure viscosity using Ostwald viscometer Determine the average molecular weight of a polymer Determine the surface concentration of 1-butanol in aqueous solution Measure the distribution coefficient of a solute betweenn two solvents 39.1 Introduction Viscosity‚ one of the transport properties‚ arises because of intermolecular attractive and
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thức ngôn ngữ và đặc biệt là các kĩ năng thực hành giao tiếp (nghe‚ nói‚ đọc‚ viết) để người học có thể sử dụng ngoại ngữ như một phương tiện giao tiếp nói hoặc viết theo nhu cầu cá nhân‚ xã hội-nghề nghiệp. Các kĩ năng thực hành có mối liên hệ khăng khít‚ hỗ trợ‚ bổ sung lẫn nhau. Để thực hành tốt một ngoại ngữ‚ không thể chỉ chú trọng kĩ năng này mà coi nhẹ kĩ năng kia. Tuy nhiên‚ mỗi kĩ năng đều có những đặc điểm riêng biệt đòi hỏi phải tính đến và nghiên cứu kĩ lưỡng để có thể nâng cao hiệu quả
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