Homework Answers
As a general rule it is easier to prevent emulsion formation rather than to break it after its formation, but there are some methods to break emulsions
1) Salting out - In this brine or salt water is added which increases the ionic strength of aqueous layer and facilitates separation of two phases by forcing surfactant like molecule to separate into one phase or the other.
2) Use phase separation filter paper
3) addition of small amount of different organic solvents
4) filtration through a glass wool plug
Add Answer to:
2. List 3 methods to remove an emulsion during an extfáction. Aud de What is the purpose of using...
2. When using the separatory funnel you may have observed a oily emulsion between the aqueous and...
2. When using the separatory funnel you may have observed a oily emulsion between the aqueous and DCM layers. What components of tea are responsible for this emulsion? How can one minimize the size of the emulsion layer? 3. How does adding the anhydrous sodium sulfate to the dichloromethane solution remove water? 4. If the above step was omitted in the isolation procedure, how would this be reflected in the yield of caffeine? 5. A student used 8.23 g of...
UDHUI U Caus lu le IUITSLUIT UI UULIT Pruuucis. 3) Explain the purpose of the following...
UDHUI U Caus lu le IUITSLUIT UI UULIT Pruuucis. 3) Explain the purpose of the following in the above experiment: a. Sulfuric acid b. Simple distillation - in step 1 C. Sodium hydroxide extraction d. Anhydrous sodium sulfate e. Ice-cooled receiving/collecting flask 1. Covering the flask with a watch alass in step 10 Questions 1) Write the reactions that represent the addition of KMnO4 and Br2 to the two alkenes. 2) Draw the full mechanism (with arrow pushing) for the...
Need help with number 2 and 3 on the postlab section. Elimination Reactions Background The purpose...
Need help with number 2 and 3 on the postlab section.
Elimination Reactions Background The purpose of this lab is to prepare an alkene by dehydration of an alcohol in the presence of an acid catalyst Elimination reactions often result in the formation of multiple products. In this lab, 2-methylcyclohexanol is dehydrated to form an alkene. The product will be analyzed by GC-MS to determine the ratio of alkene isomers formed. You will need to determine the mechanism of the...
1)Explain using drawings why acetaldehyde reacts faster than acetone to nucleophilic acyl addition. 2) 3)What is...
1)Explain using drawings why acetaldehyde
reacts faster than acetone to nucleophilic acyl addition.
2)
3)What is the major purpose of pyridine in nucleophile acyl
substitution reactions (for example, a reaction including an acid
chloride with pyridine)?
i. What is the purpose of the cyclic acetal in the following reaction? ii. Draw the product formed if the original starting material was treated with 1. LiAlH4 & 2. H20 (i.e. what would happen if the 1st and 3rd reactions were not performed?)...
1. what is the purpose of the following in this experiment: a. concentrated (and not dilute)...
1. what is the purpose of the following in this
experiment:
a. concentrated (and not dilute) hydrochloric acid
b. collecting the distillate in ice
c. sodium bicarbonate extraction
d. water extraction
e. anhydrous sodium or magnesium sulfate
chapter Alkyl Halides and Nucleophilic Aliphatic Substitution 13.1 SYNTHESIS OF BUTYL CHLORIDE Alkyl halides can be prepared by reacting an alcohol with concentrated hydrogen halides: R-OH + H-X- R-OH, R-X. HO where X-CI, Br, I. The reaction of hydrochloric acid with 2 and...
QUESTIONS TO ANSWER: Prepare a table of all chemicals used with the structure and purpose of...
QUESTIONS TO ANSWER:
Prepare a table of all chemicals used with the structure and
purpose of each.
Calculate the theoretical yield by finding limiting reactant of
the experiment by converting reactants to product (remember to show
all calculations used)
Calculate the percent yield using the limiting reactant
Calculate the Rf for triphenylmethanol. If there are two dots,
determine which one is triphenylmethanol.. ( I did not provide
data. Please let me know how I Would do this if I did)...
____ What was the purpose of hydrogen peroxide and why was it added slowly with cooling?...
____ What was the purpose of hydrogen peroxide and why was it
added slowly with cooling?
HYDROBORATION-OXIDATION OF 1-HEXENE 1. In a screw cap V-vial, prepare a solution of 0.33 g of iodine in 3 mL of dry THF. Firmly tighten the cap; keep the vial closed until ready to use. 2. In a 25 mL round-bottom flask, weigh 0.12 g of sodium borohydride. Add 8 mL of dry THF; stopper the flask with a septum, and stir the mixture...
In Java(using BlueJ) Purpose Purpose is to practice using file input and output, and array list...
In Java(using BlueJ) Purpose Purpose is to practice using file input and output, and array list of objects. Also, this lab specification tells you only what to do, you now have more responsibility to design how to do it. Problem description You are given a text file called 'Students.txt' that contains information on many students. Your program reads the file, creating many Student objects, all of which will be stored into an array list of Student objects, in the Students...
please do two pargraph about this pre lab and lab include Title,purpose ,chemical eqution if their...
please do two pargraph about this pre lab and lab include
Title,purpose ,chemical eqution if their any ،Procedure
,Hazards(hazard Identification,physical and chemical
properties),Experimental Phase, Data
&Observations,Data&Observations cont (melting point and
meling point). and Calcuations
Spinach Laboratory Procedure PROCEDURES Isolation of pigment from leaves: 1. Wash the spinach leaves. Weigh 1.0 g-2.0 g of dry spinach leaves. Remove any stems and veins from the leaves before you weigh. 2. Combine 1.0 g of anhydrous magnesium sulfate with 0.5 g of sand...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium bromide, a Grignard reagent, and react it with benzophenone to give triphenylmethanol. Grignard reagents are very reactive and must be synthesized in an environment free of water or any other source of potential proton donor. Once made, the Grignard reagent will do a nucleophilic attack on the carbonyl carbon of the ketone, benzophenone. The result is an alkoxide that is then protonated to give...
2. When using the separatory funnel you may have observed a oily emulsion between the aqueous and DCM layers. What components of tea are responsible for this emulsion? How can one minimize the size of the emulsion layer? 3. How does adding the anhydrous sodium sulfate to the dichloromethane solution remove water? 4. If the above step was omitted in the isolation procedure, how would this be reflected in the yield of caffeine? 5. A student used 8.23 g of...
UDHUI U Caus lu le IUITSLUIT UI UULIT Pruuucis. 3) Explain the purpose of the following in the above experiment: a. Sulfuric acid b. Simple distillation - in step 1 C. Sodium hydroxide extraction d. Anhydrous sodium sulfate e. Ice-cooled receiving/collecting flask 1. Covering the flask with a watch alass in step 10 Questions 1) Write the reactions that represent the addition of KMnO4 and Br2 to the two alkenes. 2) Draw the full mechanism (with arrow pushing) for the...
Need help with number 2 and 3 on the postlab section.
Elimination Reactions Background The purpose of this lab is to prepare an alkene by dehydration of an alcohol in the presence of an acid catalyst Elimination reactions often result in the formation of multiple products. In this lab, 2-methylcyclohexanol is dehydrated to form an alkene. The product will be analyzed by GC-MS to determine the ratio of alkene isomers formed. You will need to determine the mechanism of the...
1)Explain using drawings why acetaldehyde
reacts faster than acetone to nucleophilic acyl addition.
2)
3)What is the major purpose of pyridine in nucleophile acyl
substitution reactions (for example, a reaction including an acid
chloride with pyridine)?
i. What is the purpose of the cyclic acetal in the following reaction? ii. Draw the product formed if the original starting material was treated with 1. LiAlH4 & 2. H20 (i.e. what would happen if the 1st and 3rd reactions were not performed?)...
1. what is the purpose of the following in this
experiment:
a. concentrated (and not dilute) hydrochloric acid
b. collecting the distillate in ice
c. sodium bicarbonate extraction
d. water extraction
e. anhydrous sodium or magnesium sulfate
chapter Alkyl Halides and Nucleophilic Aliphatic Substitution 13.1 SYNTHESIS OF BUTYL CHLORIDE Alkyl halides can be prepared by reacting an alcohol with concentrated hydrogen halides: R-OH + H-X- R-OH, R-X. HO where X-CI, Br, I. The reaction of hydrochloric acid with 2 and...
QUESTIONS TO ANSWER:
Prepare a table of all chemicals used with the structure and
purpose of each.
Calculate the theoretical yield by finding limiting reactant of
the experiment by converting reactants to product (remember to show
all calculations used)
Calculate the percent yield using the limiting reactant
Calculate the Rf for triphenylmethanol. If there are two dots,
determine which one is triphenylmethanol.. ( I did not provide
data. Please let me know how I Would do this if I did)...
____ What was the purpose of hydrogen peroxide and why was it
added slowly with cooling?
HYDROBORATION-OXIDATION OF 1-HEXENE 1. In a screw cap V-vial, prepare a solution of 0.33 g of iodine in 3 mL of dry THF. Firmly tighten the cap; keep the vial closed until ready to use. 2. In a 25 mL round-bottom flask, weigh 0.12 g of sodium borohydride. Add 8 mL of dry THF; stopper the flask with a septum, and stir the mixture...
please do two pargraph about this pre lab and lab include
Title,purpose ,chemical eqution if their any ،Procedure
,Hazards(hazard Identification,physical and chemical
properties),Experimental Phase, Data
&Observations,Data&Observations cont (melting point and
meling point). and Calcuations
Spinach Laboratory Procedure PROCEDURES Isolation of pigment from leaves: 1. Wash the spinach leaves. Weigh 1.0 g-2.0 g of dry spinach leaves. Remove any stems and veins from the leaves before you weigh. 2. Combine 1.0 g of anhydrous magnesium sulfate with 0.5 g of sand...
Most questions answered within 3 hours.
-
What is the net ionic equation for the reaction that would occur
when an aqueous solution...
asked 2 hours ago -
A
student bought $1000 worth of furniture. What is the equivalent
annual cost if it is...
asked 3 hours ago -
What taboo subject did Ida B. Wells suggest was consensual
between black men and white women?...
asked 4 hours ago -
You have just been hired by the EPA to help with the new gas
mileage standards...
asked 5 hours ago -
4) A firm is hit by increases in its wage rate, w.
a) How does this...
asked 5 hours ago -
A square current loop 5.4 cm on each side carries a 510 mA
current. The loop...
asked 7 hours ago -
What are five tips in conducting knowledge assessment/literature
review research? Each of these tips needs to...
asked 8 hours ago -
Antigen presenting cells link innate and adaptive immune
responses. In the theoretical scenario where phagosomes cannot...
asked 8 hours ago -
Dealing with conflict, in my opinion, is a skill and an art. I
believe that those...
asked 9 hours ago -
6. A long straight wire with circular cross section and radius
1.5 cm carries a 1.2...
asked 9 hours ago -
Deacon Corporation has provided the following financial data
from its balance sheet and income statement:
Year...
asked 10 hours ago -
List and discuss at least three variables from everyday life for
which you expect the variable ...
asked 10 hours ago