Also added was 0.45mL water and 0.165mL acetic anhydride and a magnetic spin vane. An air condenser was attached to the vial and it was heated on an aluminum block, with a temperature maintained at 120C. After the solution dissolved, it was heated an extra 20 minutes to allow the reaction to go to completion then cooled back to room temperature. An ice bath was used to encourage crystal growth. The crystals were removed and centrifuged, then placed on a pre-weighed watch glass to dry and weigh. Percent recovery was found. A small sample was set aside for melting…
Dry, sublimed ferrocene (93 mg) was added to a reaction tube. Later, 0.35 mL of acetic anhydride and 0.1 mL of 85% phosphoric acid were also added. The reaction tube was capped using a septum, and a syringe needle was poked through. This was warmed over a steam bath and stirred for 10 minutes after it began to boil, forming a dark brown color. The tube was then cooled to room temperature, then further cooled in ice. A solution of 0.5mL was added, dropwise w/ mixing. 3M NaOH was added until the pH of the solution was neutral. The product was vacuum filtrated and pressed dry.…
|College: Science and Technology |Required Text(s): The laboratory manual, Experiments In General Chemistry, 6th |…
Dimethyl acetylenedicarboxylate (0.10 mL, 0.81 mmol) and nitrobenzene (1 mL) were added to to tetraphenylcyclopentadienone (0.103 g, 0.268 mmol) in a small reaction tube with a boiling stick using glass pipettes to form a dark purple soln. The rxn was then lowered into a sand bath and allowed to reflux until color change from dark purple to tan was observed. Upon cooling, ethanol (3 mL) was added and the soln was shaken to facilitate combination. The tan soln was then placed in an ice bath to cool for 10 min. The solvent was removed from the solid under vacuum filtration and washed with cold ethanol to retrieve a white precipitate.…
Observations: I observed that color change occurred and turned blue when Copper (II) nitrate and sodium hydroxide were stirred. Also precipitate was formed. When the test tube was…
3) If the hydrated cobalt (II) ion complex was refrigerated, the temperature would decrease. Since this is an endothermic reaction a decrease in temperature will actually cause the equilibrium system to move to the left, favouring the reactants. When the reactants are favoured, the color of the solution will get lighter and change to pink/light red.…
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. Substance Name Mg Cu Zn MgO CuCO3 Cu(NO3)2 NaCl Color…
Procedure: Mix 10 mL of sodium hydroxide and crystal violet solution together. After calibrating the colorimeter, insert the mixture. Absorbance data will be collected for three minutes. Analyze the data graphically to determine the reaction.…
Labs reports must be typed and chemical structures must be drawn with ChemDraw. Report must not exceed three pages (including this page). Page limit does not include any attached spectra or references.…
A Cobalt-Amine-Halide compound is synthesized from cobalt (II) chloride hexahydrate. An orange-tinted solid is produced and is considered to be unknown since the specific ligand amounts are unknown. By determining the percent composition of various elements and compounds in the unknown, its true identity can be predicted. Chloride, ammonia, and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns. Titrations using Na2S2O3 and HCl to determine percent cobalt and ammonia, respectively, are used. Silver nitrate is used to precipitate the chloride ions in the unknown, which can be measured to determine the percent composition of chloride in the unknown. The results from these three major analyses helped to draw the conclusion that the unknown is in fact [Co(NH3)6]Cl3.…
Zayas, Clovia Isabel S. and Ramonesa R. Ricardo. Laboratory Manual for General Chemistry. Manila: DLSU Press,1994…
In this experiment, 5.281g of trans isomers of [Co(en)2Cl2]Cl was synthesized from 12.249g of CoCl2▪6H2O. First, CoCl2▪6H2O was reacted with ethlenediamine (NH2CH2CH2NH2) that formed [Co(en)2(H2O)2]Cl. Then the [Co(en)2(H2O)2]Cl was reacted with H2O2 to change the cobalt’s charge to cobalt(III) from cobalt(II). Finally HCl was added into the solution to form [Co(en)2Cl2]Cl. The percent yield was 45.51%.To synthesis trans isomers of [Co(en)2Cl2]Cl, distilled water was first mixed with CoCl2▪6H2O, the solution color was changed to wine color. After ethlenediamine (NH2CH2CH2NH2) was added, the color of the solution changed to blood color, and kept its color until the solution was heated (formed brown spit). HCl was added into the solution, and…
From the stoichiometry of the reactions, acetic anhydride is in excess, and 2/3 (0.67) mole Co(acac)3 should reaction with 1 mole copper nitrate trihydrate. The actual mole ratio when 0.49 g Co(acac)3…
A plant can only have 12 hours of sunlight or less and for some plants this is too much or too short. Light is the main source of plants for food production, and also for the growth of a plant. It is needed by a plant in order to survive. Natural light is the best light needed by plants, they say, but this light may not last long every day. In using artificial light, there would be no rainy, windy and cloudy location for a plant. Plants are also for home decors, but the location of the plant indoors might not have enough natural light a plant has to. So the researchers hypothesized that artificial light can be the perfect cure for having lack of sunlight providing plants the sufficient nutrients and energy for a plant to live.…
0.2500 g portions of NaCl was weighed into Erlenmeyer flasks and about 100 mL of distilled water was dissolved in. Small quantities of NaHCO3 was added in order to adjust the pH of the solutions until effervescence ceased. About 2 mL of K2Cr04 was added and the solution was titrated with 0.1 M AgNO3 solution to the first permanent appearance of red Ag2Cr2O4.…