clay and sodium bicarbonate amended DI water was measured and poured into a 500 mL Erlenmeyer flask using a graduated cylinder. The initial pH of that sample was then measured and recorded. The predetermined dose of coagulant was poured into a 100mL graduated cylinder and DI water was added to reach a total solution volume of 100 mL. A stir bar was added to the Erlenmeyer flask along with the coagulant dose. The flask was then
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Measure water and combine the water and sample while stirring. 4) Transfer measured acid solution to a flask and add 3 drops of phenolphthalein and sodium hydroxide solution while stirring. 5) Stir and add until pink color persists in the solution. 6) Mix solution by repeatedly pouring contents into a flask and beaker to thoroughly mix. 7) Measure pH level. 8) Dispose of contents and clean flask.
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with ferric chloride‚ and is easily detected. Aspirin does not form the colored complex because the hydroxyl has been acetylated. [pic] Procedure Synthesis 1. Weigh 2.0 g of salicylic acid crystals‚ and place them in a 125-ml Erlenmeyer flask. (If mixture solidifies completely‚ proceed to step 2.) 2. Add 5 ml of acetic anhydride and 5 drops of
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specific temperature to deliver or contain VERY PRECISE amounts of liquid. Examples of volumetric glassware that we will use include burets‚ pipets‚ and volumetric flasks. Ordinary glassware has less precise volume calibrations and are used whenever the volumes do not have to be measured as accurately. Examples include beakers‚ Erlenmeyer flasks‚ and graduated cylinders. Disposable glassware (or plastic ware) is used to transfer or hold liquids temporarily and may not contain any volume markings. Examples
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Experiment 5 Preparation and Standardization of Potassium Permanganate Standard Solution Purposes 1.To know the method of preparation and standardization of potassium permanganate standard solution. 2. To grasp the principle‚ the conditions and the method of permanganate titration. 3. To grasp the determination of hydrogen peroxide in hydrogen peroxide solution with permanganate method. Principle Permanganate titration with potassium permanganate solution (KMnO4) as standard solution is one of
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an Erlenmeyer flask was filled with 10mL of one of the five citric acid samples. Then 3 drops of Phenolphthalein were added to the Erlenmeyer flask. After that the flask was placed below the buret. Then the starting volume of the NaOH in the buret was recorded. Slowly the buret was opened and the base and acid were mixed drop by drop while it was mixed. After the acid remained a consistent pink (Fig. 2) for 30 seconds the remaining volume of the NaOH in the buret was recorded. Then the flask was
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by using litmus paper or a pH strip. For the rest of the experiment‚ if the substance is being handled‚ gloves and goggles must be worn. Use a clean and dry Erlenmeyer flask and weigh it. Then‚ some of the unknown will be measured and poured into the flask. Also way the flask and the unknown. Add distilled water and phenol saline to the flask. Set that aside to prepare the biuret. Choose the substance that will be used as the titrant which will be put into the biuret. Clean out the bureau with the
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The supernate was then filtered through the use of filter paper into the Erlenmeyer flask. The filter paper having the copper (II) oxide solid used was washed with 6.00M H2SO4 thus having a reaction of: CuO(s) + H2SO4(aq) CuSO4(aq) + H2O(l) It was noted that from the colorless or clear filtrate‚ it changed into blue. Also‚ there
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powder using the pestle. 3. Weigh about 0.2 grams (+0.01 g) of the ground up tablet powder and transfer it to a clean 250 mL Erlenmeyer flask. 4. Transfer about 20 mL (+0.02 mL) of the HCl to the flask from the acid buret located on the reagent bench. Record the molarity of the HCl and the initial and final volume readings from the buret (+0.02 mL). 5. Swirl the flask to help dissolve the antacid.
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(II) nitrate‚ a graduated cylinder‚ Erlenmeyer flask‚ small test tube‚ rubber stopper‚ and small scale. Using the graduated cylinder‚ 10 mL of potassium iodide solution was measured and poured into the Erlenmeyer flask. Next‚ the lead (II) nitrate solution was poured into the small test tube until it was approximately half full. The test tube was placed inside the Erlenmeyer flask‚ and sealed with a rubber stopper – the solutions were not mixed. The mass of flask‚ stopper and
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