Calculate the concentration of grams of sodium stearate per milliliter of diluted solution. To do this, multiply the concentration of sodium stearate in the dishwashing liquid by the dilution of the solution (1.50 mL dishwashing liquid per 100 mL solution). Answer = 1.5 *10^-4 g/mL 4. Calculate the number of moles of sodium stearate in a single layer. To do this, first take the number of drops used to achieve the monolayer (1 drop) and convert it to mL using the calibrated number of drops per mL.
CaCO3 + 2HCl -----CaCl2 + CO2 + H2O ( Volume of acid added (L) ) (1.0mol/L) = moles acid added. Moles acid added - moles base added = moles acid that reacted. Moles of acid that reacted / 2 = moles CaCO3 present in sample. Final answer % CaCO3 3. Put exactly 5.0 mL of water in the 10.0 mL graduated cylinder.
Lab 2 Measurements: Accuracy and Precision A. Data Tables (36 points) Place your completed data tables into your report here: Data Table 1 Measurement | Data | Length of aluminum plastic packet | 4.50cm | Height of aluminum plastic packet | 7.50 cm | Temperature of faucet water | 26.0 degrees Celsius | Temperature of ice water | 10.0 degrees Celsius | Volume of water in 10-mL graduated cylinder | 10.0ml | Volume of water in 50-mL graduated cylinder | 9.0ml | Data Table 2 Measurement | Data | Inside diameter of 50-mL graduated cylinder | 2.50 cm | Height of 50-mL graduated cylinder | 10.0 cm | Water temperature | 25.0 degrees Celsius | Initial volume of water in 50-mL graduated cylinder | 10.0 mL | Mass of water in the 50-mL graduated cylinder (remember, 1 g of water weights 1 mL since its density is 1 g/mL) | 10.0gm | Volume of water and aluminum shot in 50-mL graduated cylinder | 18.0ml | Mass of aluminum shot (given on outside of packet) | 20.0gm | B. Follow-Up Questions (Show all calculations) Part I (Each question is worth 10 points.) 1. Convert the length and height measurements for the packet that contains the aluminum shot from units of cm to units of mm using the unit-factor method.
ISOLATION OF EUGENOL FROM CLOVES BY DESTILLATION + PUPOSE To perform distillation using a distillation apparatus and isolate eugenol from cloves. + EXPERIMENTAL The apparatus shown in figure was assembled using a 50-mL round bottom flask as the distillation pot. The distillation pot was charged with 2 g of ground cloves and 25 mL of distilled water. The cloves were allowed to soak in the water until thoroughly wetted (about 10 min), then the mixture was distilled, the distillate being collected at the rate of about one drop every 2 – 3 seconds. After about 10 mL of distillate were collected, the distillate was extracted with 5.0 mL of CH2Cl2 (aka DCM), then again with 5,0 mL of DCM.
Procedure: Fill a buret and tip with KMnO4. Place approximately 1g of iron (ii) ammonium sulfate hexahydrate in a weighing boat and mass with an analytical balance to +/- 0.0001g. Transfer the FAS to an Erlenmeyer flask. Add 25mLof distilled water, 15mL of 3M H2SO4 to the flask and swirl to dissolve the FAS. Place about 50mL of water in a beaker and 1 drop of the permanganate solution for the color constant.
This experiment can only be carried out if the solubility rules are understood and a flame test result chart is available. Materials and Methods Part 1 To commence this part of the experiment, five labeled test tubes were filled with 10 drops of their corresponding cation solutions, K+, Fe3+, Zn2+, Cu2+ and Co2+. The colors of the solutions were recorded. Next, the metal hydroxide elimination test was carried out. No more than 20 drops of 6M NaOH were added dropwise to each solution until a precipitate was observed.
Using 1 ml micropipette add 1.0 MR in each four 10 ml volumetric flasks. 3. Prepare following MR solution in four flasks: flask 1: add 5 mL pH 4 buffer (graduated cylinder) and fill to the mark with water flask 2: add 5 mL pH 5 buffer and fill to the mark with water flask 3: add 5 mL pH 7 buffer and fill to the mark with water flask 4: add 1 mL 0.01M NaOH and fill to the mark with water. 4. Record the spectrum for these four solutions in range 400-700 nm.
Step 1using a clean 10-ml pipet, transfer precisely 4.00, 3.50, 3.00, 2.50, and 2.00 ml of tap water to five separate test tubes. Step2: after rinsing the pipet with a small quantity of antifreeze, transfer precisely 1.00, 1.50, 2.00, 2.50, and 3.00 ml of antifreeze to the 70-mm test tubes to give a total added volume of 5.00 ml in each tube. Step3: stir up each tube to ensure methodical mixing of the liquids. The resultant mixtures are normally 20, 30, 40, 50, and 60% antifreeze by volume, respectively. Step4: weigh a precisely measured volume (ca.
Repeat the titration until there are two titres within 0.1cm3 of each other. Record results in a suitable table. Results: Rough Titre: 7.653 First Run: 6.553 Second Run: 6.453 Third Run: 6.553 Calculations: During the titration, iron(II) ions are oxidised to iron(III) ions and manganate(VII) ions are reduced to manganese(II) ions. The equation is as follows: 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) ? 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) The above equation shows that one mole of manganate(VII) ions reacts with 5 moles of iron(II) ions in acid solution.
The reaction was monitored and removed from the heat once the effervescence ceased, and then was allowed to cool. Concentrated hydrochloric acid was added while heating and stirring the reaction for 15 minutes. The product was then allowed to cool and was vacuum filtered to a maroon color, while being washed with water, 6M hydrochloric acid, ethanol, and acetone. Then allow the product to dry for five minutes on the funnel. The resulting product was [Co(NH3)5Cl]Cl2 and yield was 4.453g (.017 mol, 84.8%) Distilled water (25mL) was added to concentrated ammonia (5mL) in a 125mL Erlenmeyer flask.