volumetric flask‚ and 25- and 50-mL pipets were obtained from stockroom. The 0.5 g of calcium carbonate was weighted in a small 50-mL beaker. Approximately 0.4 g of the carbonate was transferred to a 250-mL beaker. 25 mL of distilled water was poured to the large beaker and 40 drops of 6 M HCl were added. Then‚ solution was heated until it just begins to boil. After boiling 50 mL of distilled water was added to the beaker. The flask was stoppered and mixed thoroughly by inverting the flask. The buret
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analytical balance‚burette‚ pipette(25ml)‚ volumetric flask(25ml)‚ conicalflask‚ beaker (50ml)‚ and thermometer. PROCEDURE 1. Calibration of volumetric flask (a) A 25ml volumetric flask was cleaned and dried then‚ accurately weighed using analytical balance. (b) The volumetric flask was filled with distilled water and weighed again. (c) The temperature of the distilled water was recorded. (d) From Table 1.1‚ the actual volume of the volumetric flask was determined. 2. Calibration of pipette (a) A
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copper. Procedure 1.Measure about 1g of solid copper. 2.Place Cu in Erlenmeyer flask and place flask under fume hood. 3.Add dropwise 15M HNO3 until solid copper is completely reacted. 4.Place flask in water bath. 5.Add 4M NaOH slowly until no more solid forms. 6.Mix contents by slowly swirling flask. 7.Place flask back in water bath‚ heat to boiling‚ and stir. 8.Heat until separation of solid and solution. 9.Cool flask and allow contents to settle. 10.Decant liquid from solid. 11.Wash
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vitamin C tablet. Once the tablet has dissolved completely‚ transfer the solution into a 250 ml volumetric flask via a plastic filter funnel. Rinse the beaker twice with some deionised water and transfer the washings into the volumetric flask. Rinse the filter funnel as well. At this point‚ more water is added carefully until the bottom of the meniscus is right on the line. Stopper the flask and complete the mixing by repeated inversions with swirling and shakings in between. Keep your hand on the
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dry the Erlenmeyer flask at the start of the experiment? The Erlenmeyer flask must be dried before the experiment in order to avoid the air from reacting with the left over water. 2. What is the reason for making the levels of water the same inside and outside of the Erlenmeyer flask while it was submerged in cold water? The reason for making the levels of water the same inside and outside of the Erlenmeyer flask so that the atmospheric pressure inside the Erlenmeyer flask is equal
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apparatus to obtain the cloves oil substance. Then with the mixtures of water and dichloromethane to form two immiscible layers. The layers were dichloromethane substance and aqueous The entire substances that are separated into two individual flasks. Then doing the rest of the chemistry experiment and performing all of the necessary techniques (extract the chemical substances Eugonol and Acetyleugenol) from the clove oil. Introduction “The Isolation of Eugenol using the Steam Distillation
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The first part was the preparation of 250ml of 1.0 M sodium hydroxide (NaOH) solution from a solid. Using a top-loading balance‚ ____ g of NaOH was transferred to a clean Erlenmeyer flask. Distilled water was then added until the solid was completely dissolved. The solution was transferred to a 250ml volumetric flask and mixed. Once mixed‚ the solution was bulked to the mark and mixed again. Finally‚ the solution was transferred to a clean plastic bottle and labeled. The second part was
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NaOH‚ rounded to two decimal places‚ was recorded on a piece of paper. Next‚ 0.750 g of KHP (unknown molarity) in a weighing dish were weighed on the balance and poured into a 250-mL Erlenmeyer flask. This measurement was recorded on the piece of paper. Measured with a 100-mL graduated
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Final Year Project Progress Report Title: Fat Content Analysis and Characterization of Food Class and Group No. : AS114103/2A1 Student Names : Chan Hoi Ching (120586347) : Chan Wai Yi (120464356) : Cheung Kit Cheung(120552694) : Lam Chi Ching (120224281) : Lam Pik Shan (120181829)
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tetraiodide during recrystallization. Experimental method1 Approximately 2.50g iodide and 1.01g tin were weighed on a balance and were placed in an Erlenmeyer flask. Approximately 10ml toluene was added to the flask. The mixture was heated on a hot plate at almost boiling temperature and was stirred using a stirring rod till the purple color in the flask faded. The solution was gravity filtered to remove solid impurities. The filtrate was set aside to cool to room temperature and was set in an ice
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