vinegar using titration method. Chemical reaction involved: CH3COOH(aq) + NaOH(aq)→ NaCH3COO(aq) + H2O(l) Apparatus: An electronic balance‚ a 10.0cm3 pipette‚ a 25.0cm3 pipette‚ a pipette filler‚ a 250.0cm3 volumetric flask‚ a burette‚ stand and clamp‚ a conical flask‚ a white tile‚ 3 large beakers‚ a small beaker‚ a dropper‚ a boiling tube‚ a rinsing bottle Chemicals: 0.1M NaOH(aq)‚phenolphthalein indicator‚ commercial vinegar (5% acidity)‚ distilled water Procedures: Part1: The density
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soluble metal carbonate and would most likely be sodium or potassium because these elements are commonly used. Materials 100 cm3 beaker‚ 250 cm3 beaker‚ 250 cm3 volumetric flask with stopper‚ filter funnel‚ glass pipette‚ glass rod‚ de-ionized water‚ Substance Z‚ 25 cm3 bulb pipette‚ pipette filter‚ 250 cm3 conical flask‚ burette‚ burette stand & holder‚ 0.1225 M hydrochloric acid‚ methyl orange indicator. Procedure: Part 1: Making a standard solution of substance Z 1. About 1.3 g to 1.7 g
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Aim: determine the mass of calcium carbonate in chicken eggshells and hence its percentage by mass Apparatus Uncertainty 25.00 cm3 pipette ± 0.03 cm3 50.00 cm3 burette ± 0.05 cm3 250.0 cm3 volumetric flask ± 0.3 cm3 50.0 cm3 measuring cylinder ± 0.5 cm3 Electronic balance ± 0.01 g Uncertainty of apparatus Measurement Mass of eggshell = 3.15 ± 0.01 g Volume of HCl added = 50.00 ± 0.5 〖cm〗^3 Volume of solution = 250.0 ± 0.3 〖cm〗^3 Volume of NaOH pipetted = 25.00 ± 0.03 〖cm〗^3
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the DOE Natural Nuclear Security Administration Laboratories‚ DOE office of Science Laboratories‚ Department of Homeland Security Laboratories‚ Department of Health and Human Services Laboratories‚ and US Customs and Border Protection Laboratories. Under the DOE National Nuclear Security Administration Laboratories there are 3 additional laboratories each that have their own set of research and development. Lawrence Livermore National Laboratory provides solutions integrating threats‚ vulnerability
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4-aminophenol into a 50cm3 conical flask‚ add 15cm3 of water and stir the suspension vigorously (magnetic stirrer) for a few minutes. * Add 2.2cm3 of ethanoic anhydride and continue stirring until the suspension dissolves and a precipitate (Paracetamol) eventually forms. * After 10 minutes filter the precipitate (using a buchner funnel)‚ washing with small amounts of cold‚ distilled water. * After drying‚ the crude product should be placed in a clean 100cm3 conical flask and recrystalised by heating
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measure out 15 mL of glacial (concentrated) acetic acid. This was poured into a 125 mL Erlenmeyer flask. Both graduated cylinders were rinsed thoroughly with acetone several times. The 2‚6-dimethylaniline was added via a Pasteur pipet to the acetic acid. The graduated cylinder was rinsed with acetone and left to air dry. 2 mL of 2-chloroacetyl chloride was measured and poured into the Erlenmeyer flask. A thermometer was placed to record any temperature change during this process. A large graduated
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bottle of distilled water‚ glass rod‚ 250 cm3 volumetric flask‚ filter funnel‚ dropper‚ burette‚ stand‚ beakers X 2‚ 100 cm3 pipette‚ 25 cm3 pipette filler‚ sodium carbonate mixture‚ 250 cm3 conical flasks X 3‚ white tile‚ phenolphthalein‚ methyl orange indicator Procedure Part I 1. Transfer 10.00g of the sample onto the watch glass and weigh it to the nearest 0.01g. 2. Prepare a solution of the sample in 250 ml volumetric flask. 3. Using the funnel‚ rinse the burette with the hydrochloric
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repeatedly measure out small volumes of solutions A–I. The burette made the task convenient‚ and it is a precise instrument. | 250 cm3 volumetric flask | I needed to make up a specific volume of a standard solution. The volumetric flask has a low error. | 100 cm3 volumetric flask | I needed to make up a specific volume of a standard solution. The volumetric flask has a low error. | Top pan balance | I needed to accurately weigh out small amounts of solid when making up my solutions. | 25 cm3 Mohr
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Name: Lisa Brewer iLab‚ Week # 2 CATIONS AND ANION LAB Introduction The purpose of this week’s lab is to learn to demonstrate a double-replacement reaction of ionic compounds. To accomplish this‚ two ionic compounds will be mixed together and the product will precipitate out of solution. In this procedure‚ the product must be precipitated out of the solution and then weighed. For this lab‚ lead (II) nitrate (Pb(NO3)2) and potassium chromate (K2CrO4) will be reacted together to demonstrate
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were placed in a 50mL round-bottomed flask. The reaction mixture was refluxed for 1 hour and the flask was cooled in a beaker in the water of room temperature. The solid was formed in the mixture and the flask was shaken until it dissolved. The flash was rinsed with 15 mL dichloromethane and it was added to the separating funnel. 10 mL of water was added to the funnel and shaken to mix the layers. The lower organic phase was drained into the Erlenmeyer flask and the aqueous phase out of the funnel
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