ELN Extraction

Can I get detailed explanation for this table , mentioning the apparatus and when’s the timer is started ? What happens next

To which sample solution the spike will be add?  the distillate>130C the mass standard the distilled <130C

You wash a separatory funnel with soap and water to ensure it is clean before extracting an aqueous solution with dicholormethane. You should take the time to make sure there are no drops of water left inside the separatory funnel. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True False

An oil sample had its iodine number determined using the pyridinium tribromide method. The sample and reagents used are as follows: Oil sample: 0.19 mL, density: 0.954 g/mL Pyridinium tribromide: 0.472 g Na2S203: 0.1 M, endpoint 27.68 mL %3D What is the approximate Bromine Number? O 138 89 O 120 O 200

TRUE OR FALSE, if false then give the correct word to make the statement true then explain 1. Sublimation occurs when a solid has a relatively high vapor pressure at a temperature [above] its melting point. 2. To isolate the desired chemical, a single extraction is [more efficient] than extracting the compound numerous times. 3. The compounds are separated in liquid-liquid extraction based on their relative solubilities in two [immiscible] liquids.

[three]

D. Solvent Extraction Samples Upper phase Lower phase Oil + Water Kerosene + Oil

Use the following data to answer questions 1-5 below. Metal Rxn with Rxn with Rxn with room Rxn with warm acid water steam temp acid Didn't observe Fizzes slightly Vigorous gas production Small bubbles Didn't observe NR Steady stream of bubbles Didn't observe C Didn't observe NR NR A few bubbles Didn't observe Didn't observe Vigorous Vigorous bubbles and the sample dissolves bubbles Question 1 Which of the following is the least active metal? O A OD O B MacBook Pro

read the Procedure and answer the post lab questions below: Using a balance, mass between 1.50 – 2.00 grams of sodium carbonate in a pre-massed 150mL beaker. Add 20 mL of distilled water and stir thoroughly to make sure all the crystals are dissolved. Rinse the stirring rod with a little distilled water after stirring. Using a balance, mass between 1.50 – 2.00 grams of calcium chloride dihydrate in a pre-massed 50 mL beaker. Repeat Step 2 for the solution in the 50 mL beaker. Pour the calcium chloride solution into the 150mL beaker containing the sodium carbonate solution and stir. Mass a piece of filter paper. Fold the filter paper and place it into the funnel. Wet it with a little distilled water to ensure that it is stuck to the sides of the funnel. Slowly pour the mixture from the beaker into the funnel and collect the filtrate into a 125mL erlenmeyer flask. Do not allow the mixture to rise above the edge of the filter paper. Rinse the beaker with about 10 mL of distilled water.…

read the Procedure and answer the post lab questions below: Using a balance, mass between 1.50 – 2.00 grams of sodium carbonate in a pre-massed 150mL beaker. Add 20 mL of distilled water and stir thoroughly to make sure all the crystals are dissolved. Rinse the stirring rod with a little distilled water after stirring. Using a balance, mass between 1.50 – 2.00 grams of calcium chloride dihydrate in a pre-massed 50 mL beaker. Repeat Step 2 for the solution in the 50 mL beaker. Pour the calcium chloride solution into the 150mL beaker containing the sodium carbonate solution and stir. Mass a piece of filter paper. Fold the filter paper and place it into the funnel. Wet it with a little distilled water to ensure that it is stuck to the sides of the funnel. Slowly pour the mixture from the beaker into the funnel and collect the filtrate into a 125mL erlenmeyer flask. Do not allow the mixture to rise above the edge of the filter paper. Rinse the beaker with about 10 mL of distilled water.…

The distillation flask is best     completely filled with mixture   as large as available       never less than half empty   about 70% full

In each scenario, describe a step by step process in determining the unknown. Distilled water maybe present in all scenarios along with the sample. Scenario 1: Determining the Density of Liquid Apparatus Given: Graduated Cylinder Lab Equipment: Digital Balance Scenario 2: Determining the Density of Solid Apparatus Given: Graduated Cylinder, Beaker Lab Equipment: Digital Balance Scenario 3: Determining the Porosity Apparatus Given: Graduated Cylinders Scenario 4: Determining Moisture Content of Hygroscopic Solids Apparatus Given: Crucible Lab Equipment: Analytical Balance, Oven

Color BEFORE adding Color AFTER adding Intensity of color AFTER adding FeCl3 Test Tube # FeCl3 FeCl3 #1 (salicylic acid) clear lilac 100% #2 (commercial aspirin A) clear slightly pink 50% #3 (commercial aspirin B) clear lilac 95% #4 (aspirin from your clear pink 20% synthesis above) #5 (control) clear clear 0% Based on this data and the melting point of Aspirin, how pure is the synthesized product?

The following test on compounds X and Y were done and the results, list the observations in the table below. Complete the inferences for each test.

Describe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in range

Bromophenol blue= max 600 concentration (M) of the original solution =10.0 mg/L absorbance solution 1 = 0.20 solution 2 = 0.43 %3D %3D solution 3 = 0.66 solution 4 = 0.93 %3D solution 5 = 1.10 I need the concentration (M) in all the solution

10 mL of 10 % sodium sulphate solution into a clean test tube. Add 1 drop of 10 % barium chloride. What do you observe? Write an equation to explain your observations in your lab report. C2. Measure out a fresh 10 mL portion of 10 % sodium sulphate into another test tube. Making sure to count the drops, use a dropper to add 30 % calcium chloride solution. Swirl the solution after each drop. Continue until a white precipitate occurs. Write an equation to explain your observations. Which solubility product has the smaller numerical value, that for calcium sulphate or barium sulphate? Explain how you know this is true. C3. Measure out another 10 mL portion of 10 % sodium sulphate into a clean test tube. Add 8 drops of 50 % sulphuric acid and swirl. Count the number of drops (swirl after each drop) of 30 % calcium chloride needed to produce a precipitate of calcium sulphate. Explain why the number of drops of calcium chloride differs in the two experiments. I need equations, observations…

What are the different melting point apparatus that are available for routine analysis? Describe each.

Pp

what is the BP range for hexane and toluene?

1. Calculate the exact concentration of the stock protein solution in (mg / mL) based on the exact mass of albumin and the volume of the vial used to prepare the broth.     0.4905 g of albumin in 500 mL volumetric flask (mass of protein used to prepare the stock

Compare the three main purification methods (recrystallization, distillation, and extraction) by stating whateach one is best for.

Which of these is NOT true of a good recrystallization solvent? Which of these is NOT true of a good recrystallization solvent? a) The compound is insoluble in the solvent when it is cold. b) The solvent boiling temperature is at least 40 °C. c) The solvent has many impurities. d) The compound is soluble in the solvent when it is hot.

How do you separate sodium hydroxide from the crude mixture?

Describe the procedure of how to collect and dry your newly recrystallized compound.

estimate the composition of these initial samples of distillate using figure 1. Based on the results what conclusion can you draw regarding the relative efficiencies of the two separations?

wwwd ICTor, KI, IS. traveled by the fastest compound divided by distance traveled by the slowest compound ce traveled by the slowest compound divided by distance traveled by the fastest compound ance traveled by the solvent divided by distance traveled by the compound distance traveled by the compound divided by distance traveled by the solvent 23-The maximum quantity of a mixture that can be separated with a given efficiency by a particular process a)-Capacity factor b)-Delectability c)-Efficiency d-Load capacity 24- The distribution coefficient of a compound is 1 and its concentration in organic layer is 3 M. Then, its concentration in aqueous layer is a)-4 M b)-3 M c)-2 M 25-It is an apparatus in which one or more solutes are transported from one fluid to another through a membrane a) reverse osmosis b)Dialyzer c) Electrophoresis d)Gas chromatography 26- Which are commonly used as adsorbents? a)Ethanold water b)Helium& Argon c) Silica gel &alumina 27- The photoionization detector in…

Weigh out 5g of table salt. Dissolve it in 50mL of distilled water in a container using a stirrer and label appropriately. Calculate the concentration in terms of percent mass per volume.

What is Kemmerer water sampler

Calculate the volume of NaOH used in each trial. Use sig figs.