Questions LLC
Login
or
Sign Up
Ask a New Question
Laboratory Techniques
Page 7
Questions (370)
I'am unable to identify which is upper meniscus and lower meniscus while taking a solution in burette.please tell me how to
2 answers
asked by
J.Nandhini
541 views
We did a lab to find the atomic mass of Magnesium. We used an eudiometer and HCL and a mg ribbon.
Explain in terms of moles,
2 answers
asked by
Denise
526 views
A titration to standardize a HCl solution was performed by taking 50.0ml hydrochloric acid in a flask with a few drops of
2 answers
asked by
martha
571 views
An unknown was prepared with the concentration of 0.000630 M. A Beer's Law plot was prepared using the absorbance values from
7 answers
asked by
Anonymous
582 views
1) Describe how you would dilute 10mL of concentrated sulfuric acid to 100mL.
2) Describe how you would make 500 mL of 0.1 mol L
3 answers
asked by
anonymous
548 views
A standard addition method is used to determine the concentration of ethanol in an
unknown sample. Six 10 mL aliquots of the
2 answers
asked by
asery
543 views
What volume of solution should be dispensed from the buret to provide 3.718 mmol CO3 2-? answer in units of mL.
2 answers
asked by
chemistrry help!
512 views
After synthesizing your alkyl halide, Which layer will be the organic layer?
2 answers
asked by
Hola
512 views
In the laboratory you will be provided with a 1.0 x 10-5 M primary stock solution of fluorescein (MW=332.31g/mol). The
2 answers
asked by
Bruce
526 views
Starting with solid Tris base (FW 121.1) and 1 M HCl, describe how you would make 2 liters of 200 mM Tris-HCl buffer pH 7.5. pKa
2 answers
asked by
Brittnay
519 views
How would I prepare 25mL each of the dilute solutions of 5mL, 10mL and 20mL and is it possible to dilute it too much?
2 answers
asked by
Aman
534 views
One student calibrated a 50-mL burette by using the mass of water delivered. The student used an analytical balance which was
2 answers
asked by
nicS
532 views
For a TLC lab,the stationary phase is the mixture of isopropanol and ammonia or the mixture of hexane,ethyl acetate and ethanol,
3 answers
asked by
Leon
515 views
How can a mixture of ammonium chloride,KCl,lead(2)chloride could be separated in the laboratory
5 answers
asked by
Michael
501 views
Why is it important that the sequence of addition of reagents be followed? What could possibly go wrong when this is not
2 answers
asked by
smiley
522 views
briefly explain the problem that will be created if you
(a) mark the origin line with a washable flet-tip markromatogram until
1 answer
asked by
mary
515 views
I need to determine the "percentage composition unknown" whatever that is. My current data: a) mass of test tube and foil cover:
2 answers
asked by
Selina
508 views
One student calibrated a 50-mL burette by using the mass of water delivered. The student used an analytical balance which was
1 answer
asked by
tanjiro
513 views
Grant’s DNA sample has a concentration of 45µg/mL, and he has 350µL of solution. Which of the following answers would allow
2 answers
asked by
briana
516 views
a chloride standard containing 100mmol/L of chloride ion can be prepared by dissolving the following amount of NACL in 1000ml of
4 answers
asked by
james Neil
510 views
In a lab we are trying to find the percent yield of NaCl collected after evaporating the water off an NaCl solution. We made up
1 answer
asked by
Chris
523 views
Three bottles lost their labels. One contained an aqueous solution of HCl, another an aqueous solution of HNO3, and the third
2 answers
asked by
Anonymous
521 views
This is due very soon, please help!!!
Describe how you would prepare the following two solutions. Be sure to include the type of
2 answers
asked by
Joe
505 views
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did
2 answers
asked by
derek
519 views
can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 sloutions using only the titration technidue
2 answers
asked by
kendar
498 views
This is for my vinegar titration lab: why are samples of vinegar weighed rather than measured ?
2 answers
asked by
Sara
504 views
During this lab, the reaction mix is filtered. Filtration is often used to separate a solid from a liquid. In this lab, when the
2 answers
asked by
Anonymous
496 views
would you expect the absorbance to be higher or lower if the dilution of one of the solutions went under the calibration mark on
3 answers
asked by
irene
490 views
how to prepare a 250 mL solution of .15 M K2SO4 with a volumetric flask
2 answers
asked by
Danny
505 views
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 . The diluted
2 answers
asked by
boston
514 views
A student is instructed to standardize an approximately 2.5N KOH solution using a 0.500N H2SO4 stock solution. Describe the
2 answers
asked by
Candice
495 views
Given dry, powdered Evans Blue, how would you prepare 100 mL of a 500 mg/L stock solution using water as the diluent?
I would
2 answers
asked by
Cassidy
497 views
A student did not fully mix the solution of Oxalic Acid in the volumetric flask predict and explain the effect of the range of
2 answers
asked by
andrea
506 views
2. Aluminum chloride was a product in step 6. How could you instruct your lab partner to recover it.
2 answers
asked by
jhong
484 views
In a wet lab you will separate the solid aspirin from the liquid via gravity filtration. What must you do to ensure that you
2 answers
asked by
Lynne
494 views
I have a lab finished and I have to find the dehydrated sample (show calculations) and the value of n (show calculations). I
2 answers
asked by
Ashley
493 views
help with the chem lab. the molecular of a volatile liquid.
2 answers
asked by
Bmt
485 views
How to prepare a 750mL stock solution with a 0.40 M Na2S2O3.
4 answers
asked by
GoodinChem619
476 views
1)Write the general equation used to determine the volume of stock required to make a given concentration of standard? Define
1 answer
asked by
josh
495 views
Recrystallization Lab
What are the potential consequences of using a spatula to scrape crystals from wet filter paper during
2 answers
asked by
Andrew
468 views
Using your 0.0100M oxalate solution and only the equipment and supplies listed below, describe how to prepare a 0.00025M
2 answers
asked by
Annie
469 views
30g of the palm shell were mixed with 15ml H3PO4 and 100ml of distilled water in a 250ml conical flask.The concentration of
1 answer
asked by
Merlina_Lyn
475 views
explain how you can obtain pure samples from a mixture containing ammonium chloride,copper(ii)oxide and potassium carbonate
1 answer
asked by
Anonymous
480 views
When weighing liquid ethanol, why do you have to place water in the beaker prior to adding the ethanol to that same beaker?
3 answers
asked by
Chem
459 views
When Dr. Farrell was a graduate student, he prepared a buffer of pH = 8.0 from Sodium Acetate. Why would the casual observer to
1 answer
asked by
Laura
445 views
what is the purpose of using an ice bath in organic chemistry when isolating the final product?
1 answer
asked by
Denaiel
467 views
in making a solution of an unknown solid substance to test it for the presence of ions, would it matter if you used pure water
1 answer
asked by
lester
457 views
What type of prac do you think you need to use a filter funnel and filter paper.
please help quickly
1 answer
asked by
raj
444 views
If you make a solution in the laboratory that contains 0.1 M acetic acid (CH3COOH), what concentration of hydronium will you
1 answer
asked by
Rose
430 views
Sorry. What I meant was:
How do we improve the efficiency of Flash Column Chromatography?
1 answer
asked by
Alan
465 views
Pages
1
2
3
4
5
6
7
8
Parent Categories (20)
Biochemistry
Biology
Biology/Chemistry
Chemistry
Chemistry Education
Forensic Science
Inorganic Chemistry
Microbiology
Molecular Biology
Organic Chemistry
Physics/Measurement
Science
Science & Laboratory
Science & Scientific Experiments
Science and Chemistry
Science and Research
Science Education
Science or Biology
Science/Chemistry
Scientific Research