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Laboratory Techniques
Page 2
Questions (371)
What chemical sometimes used to make the specimen visible
3 answers
asked by
Anna
891 views
If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration
for the
4 answers
asked by
Confused
1,897 views
Stock solution A is prepared by dissolving 182 mg of ferrous ammonium sulfate in water and diluting to volume in a 500-mL
3 answers
asked by
Anonymous
644 views
Discuss three unavoidable sources of error in Part 1
(the synthesis of the crystals) of this experiment and identify the major
3 answers
asked by
Jake
799 views
Why is filter paper a poor material on which to powder a solid before introducing it into a melting tube?
3 answers
asked by
charlotte
1,194 views
a biologist prepared a strip of agar (a gelatin- like substance) as shown in the figure below. at position 7, he placed a
3 answers
asked by
jessica cook
680 views
Question: While performing a crystallization, you obtain a light tan solution after dissolving your crude product in hot
3 answers
asked by
Sheryl
1,467 views
Why we add HCL ot H2SO4 during the experiment Of iodometry?
1 answer
asked by
Mikel
406 views
You need to make a 2 fold serial dilution starting at 1:100 and ending at 1:3200. You need 2 ml in each test tube when you are
1 answer
asked by
michele
677 views
CONCLUSION about using the gravimetric technique, the aim is to determine the water potential of potato tissue
3 answers
asked anonymously
26 views
I need to write an abstract for my chemistry lab for identifying an unknown acid, is there a generic list of what to do for an
5 answers
asked by
Amber
1,006 views
How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution's concentration? How is
3 answers
asked by
Sandy
860 views
I need help with a lab report on extraction of iodine by dichloromethane, please help!
4 answers
asked by
Delia
725 views
Why do you need to remove the chromatogram before the solvent reaches the upper edge?
2 answers
asked by
Anonymous
1,002 views
Prepare 250mL of 0.02 M Phosphate buffer in which [H2PO4]- = [HPO4]-
Calculate the volumes of 2 M phosphoric acid and 1 M NaOH
1 answer
asked by
Sam
399 views
Using 0.1M phosphate buffer, pH 7.2, prepare 25ml each of the buffer solutions with the following concentrations at pH 7.2:
1.
2 answers
asked by
jen
850 views
Suppose water contained some harmful volatile substance. How could you easily remove the volatile substance in a laboratory?
2 answers
asked by
Z
861 views
Lab: Titration of NaOH (0.1 molar)to unknown solid acid. Trying to determine the equilivent weight of the unknown acid in the
3 answers
asked by
Dee
543 views
In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate
3 answers
asked by
anne
986 views
if air bubbles remain in the burette during the titration, what will the effect be on the calculated values of ::
a- the
4 answers
asked by
Huda
2,021 views
what test will you perform to determine when you have added sufficient NaOH solution to the reaction mixture in reaction 2
2 answers
asked by
erlicia
645 views
How would you usually prepare starch indicator solution for iodine titrations? Can the solution be stored for a few months in
3 answers
asked by
annie
1,627 views
Why is it important to make sure there are no air bubbles in the tip of a buret below the stopcock before using the buret to
3 answers
asked by
mohammad
1,152 views
An experiment in your laboratory requires exactly 500mL of 0.0200M solution of Na2CO3. You are given solid Na2CO3, distilled
3 answers
asked by
Blessings
872 views
Prepare 100ml of 2.50M HCl solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom
4 answers
asked by
Maria
1,683 views
Why must not the condensed water drip into flask in finding molecular weight of volatile liquids?
3 answers
asked by
John
790 views
How to prepare 0.5m of HCL using 500ml standard flask
2 answers
asked by
victor
531 views
1. A chemist conducted a recrystallization on 18.5 g of a solid and collected 11.2 g as a first crop. She re-cooled the mother
3 answers
asked by
Parm
568 views
a pipet can be calibrated. we expected the volume to be 25.00ml, but the actual volume was significantly less. if you had
3 answers
asked by
mary
730 views
what two ingredients are used to prepare basic buffer solution??
3 answers
asked by
Naz
1,120 views
is this right?
5. After heating the crucible is set on the lab bench where it is contaminated with the cleaning oil used to clean
3 answers
asked by
Diana
1,753 views
Prepare 250ml of 0.2M phosphate buffer of pH 6.4.starting from Na2HPO4,NaH2PO4,0.129N NaOH solution.
3 answers
asked by
Rita
914 views
how much volume of naoh required for titration with khp to the equivalence poin
3 answers
asked by
nazee
406 views
If you use a dirty buret, the titrant leaves drops of solution behind as the meniscus descends during delivery of the solution.
T
6 answers
asked by
Anonymous
1,454 views
Describe the correct technique for reading the meniscus of a solution in the buret.
3 answers
asked by
Josh
1,398 views
why should you use a minimum amount of water to rinse the conical vial while transferring the purified acetaminophen to the
3 answers
asked by
teddy
1,023 views
what are the sources of error in preparing ester lab?
3 answers
asked by
maggi
1,385 views
how would you prepare 175.0ml of .150 m agno3 solution starting with pure agno3
2 answers
asked by
Anne
670 views
Carborundum (silicon carbide) boiling chips are better than calcium carbonate chips in the recrystallization of an unknown,why ?
4 answers
asked by
david
1,515 views
During lab, you are provided with a stock antibody solution (Ab) that has a concentration of 400 μg/μl. For lab, it is
2 answers
asked by
gabrielle
730 views
Why is it important to swirl the NaOH solution each time before using it during a titration?
3 answers
asked by
K
748 views
The blank solution used to calibrate the spectrophotometer is 10.0mL of 0.2M Fe(NO3)3 diluted to 25.0mL with 0.1M HNO3. Why is
3 answers
asked by
Sue
1,971 views
why is it recommended to carryout iodometric titrations as quickly as possible and to get the first endpoint
3 answers
asked by
karthika
372 views
We are always told to use freshly prepared potassium iodide (KI) for titrations. Why?
3 answers
asked by
candy
424 views
The molar mass of a volatile liquid (one which vaporizes easily) can be determined by a the DUMAS METHOD.' In this process a
6 answers
asked by
D
2,013 views
Sorry DrBob, it's me again!
Here's the info: Antacid Brand: Life Concentration of HCl: 0.1845 M Concentration of NaOH: 0.1482 M
6 answers
asked by
Akhed-To DrBob222
1,786 views
Please help me answer this question;
The goal of the recrystallization procedure is to obtain purified material with a maximized
4 answers
asked by
Judy
2,294 views
. What effect would vapor condensation in the neck of the 15-mL Beral-type pipets have on the reported molar mass? How large an
3 answers
asked by
3
1,132 views
Each of the solvents given should effectively separate of the following mixtures by TLC. Match the appropriate solvent with the
4 answers
asked by
Nina
1,805 views
A student is performing a Benedict’s test on an unknown substance. The student adds the reagent (the chemical required to make
2 answers
asked anonymously
50 views
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