when vacuum filtering, why remove the filtrate before pulling air over any formed crystals?
when vacuum filtering, why remove the filtrate before pulling air over any formed crystals?
Homework Answers
Vacuum filtration is a filtration process where the soild product or crystals can be efficiently separated from the reaction mixture. The solid is trapped by the filter and the liquid is drawn through the funnel into the flask below by a vacuum. Now with increasing the volume of vacuum the more will be the pull and more rapid be the filtration. Thats mean the rate of filtration is actually greater, so when some volume of filtrate is present it can often looked that the rate of filtration is solw because of the decrease of volume of vacuum. So to increase the rate filtrate must be removed time to time.
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when vacuum filtering, why remove the filtrate before
pulling air over any formed crystals?
You are suggested to remove all parental flies from the vial before any F1 fly emerges....
You are suggested to remove all parental flies from the vial before any F1 fly emerges. Why this requirement is imposed. What will happen if we leave parental flies in the same vial? When you were setting your crosses, you may have noticed that the UAS-white-RNAi expressing flies had red eyes. Why does the RNAi not work in these flies? How is the chi-square test used to analyze genetic crosses? What does the probability (p-value) associated with a chi-square value...
SYNTHESIS OF trans-p-ANISALACETOPHENONE Prepare a table of all chemicals used in the procedure with their purpose...
SYNTHESIS OF trans-p-ANISALACETOPHENONE
Prepare a table of all chemicals used in the procedure with
their purpose
Melting point of trans-p-anisalacetophenone (with source) and
Molar mass of trans-p-anisalacetophenone (with source) (i cant find
these two things anywhere)
Procedure: 1. Carefully measure 1.0 mL each of p-anisaldehyde and acetophenone and place them in a screw-cap testtube. 2. To this add 3.0 mL of 95% ethanol. Shake the test tube gently to achieve a homogenous mixture. 3. Add 6-7 drops of 40% sodium...
Air flows over a solid slab of frozen carbon dioxide formed in dry ice with an...
Air flows over a solid slab of frozen carbon dioxide formed in dry ice with an exposed cross- sectional area of 1.0x109 m². The carbon dioxide sublimes into the 2.0 m/s flowing stream at a total of mass flux rate is 2.29x107 mol/s and partial pressure is 4.7410Pa. The air is at ambient conditions of 293 K and 1.01310% Pa pressure. At this ambient condition, the diffusivity of carbon dioxide in air is 1.5x10-6 m²/s. At ambient conditions (293 K...
i need to calculate the theortetical yield by finding the limiting reactant of the experiment by...
i need to calculate the theortetical yield by finding the
limiting reactant of the experiment by converting reactants to
product, then calculate the percent yield using the limiting
reactant
-in my experiment the amout of crystals i obtained was 1.232 g
(watch glass + filter paper = 31.228 g and watch glass, filter
paper, + crystals = 32.460 g)
REACTION SCHEME H сно, ОН- ОСH, CH panisaldehyde acetophenone Molar Mass: 120.15g/mol Molar Mass: 136.15g/mol Molar Mass: 239.30g/mol Density: 1.119g/mL Density:...
Running the Reaction Add 0.100 g benzil and 0.30 mL 95% ethanol to a 3-mL conical vial. Place a s...
Determine the theoretical yield and limiting reagent
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what is the theoretical yield of anisalacetophenone and dibenzalacetone formed? thank you. The Aldol Condensation Precautions:...
what is the theoretical yield of anisalacetophenone and
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The Aldol Condensation Precautions: Acetone, ethanol and acetophenone are flammable; work in a fume hood. Sodium hydroxide is a strong base and can cause severe skin burns and eye damage. Safety goggles are required. Gloves are recommended. Purpose To carry out two Aldol condensation reactions in which no heat is needed to obtain the condensation product. The two reactions differ in the number of enolizable protons at the...
3) Meld lines are formed when two separate flow fronts meets. These are preferred over weld lines...
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need help answering these questions Chemistry 2211(PRIVATE) LABORATORY PRACTICUM - 4 DO NOT CONSULT WITH OTHER...
need help answering these questions
Chemistry 2211(PRIVATE) LABORATORY PRACTICUM - 4 DO NOT CONSULT WITH OTHER LABORATORY STUDENTS, THE LABORATORY INSTRUCTOR OR GRADUATE ASSISTANT UNLESS AN ISSUE OF SAFETY, EQUIPMENT NEEDS, OR EQUIPMENT FAILURE OCCURS. You may consult your laboratory notebook or the reference books in the laboratory You may take up to 150 minutes to carry out the procedure, complete your notebook writeup on the experiment, and submit to the instructor the notebook and clearly labeled product. THE MATERIALS...
Experiment 8 Conservation of Mass kussion: action: 170 Mole wt. g/mol Aqual the combined masses of...
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SYNTHESIS OF trans-p-ANISALACETOPHENONE
Prepare a table of all chemicals used in the procedure with
their purpose
Melting point of trans-p-anisalacetophenone (with source) and
Molar mass of trans-p-anisalacetophenone (with source) (i cant find
these two things anywhere)
Procedure: 1. Carefully measure 1.0 mL each of p-anisaldehyde and acetophenone and place them in a screw-cap testtube. 2. To this add 3.0 mL of 95% ethanol. Shake the test tube gently to achieve a homogenous mixture. 3. Add 6-7 drops of 40% sodium...
Air flows over a solid slab of frozen carbon dioxide formed in dry ice with an exposed cross- sectional area of 1.0x109 m². The carbon dioxide sublimes into the 2.0 m/s flowing stream at a total of mass flux rate is 2.29x107 mol/s and partial pressure is 4.7410Pa. The air is at ambient conditions of 293 K and 1.01310% Pa pressure. At this ambient condition, the diffusivity of carbon dioxide in air is 1.5x10-6 m²/s. At ambient conditions (293 K...
i need to calculate the theortetical yield by finding the
limiting reactant of the experiment by converting reactants to
product, then calculate the percent yield using the limiting
reactant
-in my experiment the amout of crystals i obtained was 1.232 g
(watch glass + filter paper = 31.228 g and watch glass, filter
paper, + crystals = 32.460 g)
REACTION SCHEME H сно, ОН- ОСH, CH panisaldehyde acetophenone Molar Mass: 120.15g/mol Molar Mass: 136.15g/mol Molar Mass: 239.30g/mol Density: 1.119g/mL Density:...
Determine the theoretical yield and limiting reagent
Running the Reaction Add 0.100 g benzil and 0.30 mL 95% ethanol to a 3-mL conical vial. Place a spin vane in the vial and attach an air condenser. Heat the mixture with an aluminum block (90-100°C) while stirring until the benzil has dissolved (see inset in Tech- nique 6, Figure 6.1A). Using a 9-inch Pasteur pipette, add dropwise 0.25 mL of an aqueous potassium hydroxide solution' downward through the condenser into the...
what is the theoretical yield of anisalacetophenone and
dibenzalacetone formed? thank you.
The Aldol Condensation Precautions: Acetone, ethanol and acetophenone are flammable; work in a fume hood. Sodium hydroxide is a strong base and can cause severe skin burns and eye damage. Safety goggles are required. Gloves are recommended. Purpose To carry out two Aldol condensation reactions in which no heat is needed to obtain the condensation product. The two reactions differ in the number of enolizable protons at the...
3) Meld lines are formed when two separate flow fronts meets. These are preferred over weld lines as they will normally result in improved structure. In manufacturing, the Weld line or Meld line is the 'knit line where two flow fronts meet and there is the inability of two or more flow fronts to "knit" together, or "weld", during the molding process. These lines usually occur around holes or obstructions and cause locally weak areas in the molded part. These...
need help answering these questions
Chemistry 2211(PRIVATE) LABORATORY PRACTICUM - 4 DO NOT CONSULT WITH OTHER LABORATORY STUDENTS, THE LABORATORY INSTRUCTOR OR GRADUATE ASSISTANT UNLESS AN ISSUE OF SAFETY, EQUIPMENT NEEDS, OR EQUIPMENT FAILURE OCCURS. You may consult your laboratory notebook or the reference books in the laboratory You may take up to 150 minutes to carry out the procedure, complete your notebook writeup on the experiment, and submit to the instructor the notebook and clearly labeled product. THE MATERIALS...
Experiment 8 Conservation of Mass kussion: action: 170 Mole wt. g/mol Aqual the combined masses of all the reactants that were initially present. Furthermore, we fter any chemical reaction, the total mass of new products and any left over reactants) will a predict the mass of each product that will be formed if we know the molecular weight or the formula (from which we can predict the molecular weight). As an example, consider the dissolve the two substances in water,...
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