CHM1045 Lecture Notes - Lecture 2: Sodium Bicarbonate, Potassium Dichromate, Litmus
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Procedure: instructor demonstrations, heating k2cr2o7 and (nh4)2cr2o7 a. Repeat with calcium carbonate, sodium chloride, and sodium hydrogen carbonate: describe the appearance of each and note any differences among them, in first row of each column, add di water to each well until about half full. Test contents with blue litmus paper record observations. (stays blue no reaction or turns red acidic : add a drop of phenolphthalein indicator to each of wells in second row. Record observations. (turns pink basic or no color change no reaction : third row each column, add 3-5 drops 0. 1 m hcl solution and stir. Record observations. (look for bubbles: use wash bottle of di water to rinse contents into waste container provided. Clean well plate using detergent + water + final deionized water rinse. Gently dry the well plate: observations of unknown substances, columns labeled 1, 2, 3, 4. Place small scoop of substances 1, 2, 3, 4 from bottles on lab bench.
