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Laboratory Techniques
Page 6
Questions (377)
Using Volumetric Glassware to Measure, Dilute,and Titrate Acid Solution
1)For each of the following procedural errors, indicate
2 answers
asked by
Anonymous
855 views
You are given a 25.0mL volumetric flask, describe the procedure you will follow in lab to prepare 25.0mL of a 0.019 M solution
3 answers
asked by
fredy
850 views
The following state were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL).
3 answers
asked by
James
845 views
Aspirin can be prepared by the reaction of salicylic acid with an excess of acetic anhydride, using phosphoric acid as a
2 answers
asked by
Paul
831 views
Prepare 1.5 liters of 0.25 M Tris buffer, pH 7.5.
Useful information: pKa Tris = 8.1 Formula weight of Tris (hydroxymethyl
1 answer
asked by
steven
841 views
One student calibrated a 50-mL burette by using the mass of water delivered. The student used an analytical balance which was
5 answers
asked by
Len1331
814 views
Why did you need to know the density of the bleach solution? Why didn't you measure the density of h2o2 solution as well?
Stoichi
2 answers
asked by
HELP PLEASE
779 views
How to make 100 mL of 100mM of Tris HCl and 100 mL of 100mM of Tris Base. Follow the pH of the resulting combined solution as it
7 answers
asked by
Charlotte
797 views
how is bumping avoided in the preparation of a hot water bath
2 answers
asked by
Anonymous
752 views
In a titration, NaOH was added to a burette. The initial reading was 1.2 ml. At the end of the titration, the final reading was
2 answers
asked by
zakk
746 views
Accurately weigh 0.9-1.1 g into a 200 mL beaker.
Dissolve the KIO3 in a small amount of distilled water. Quantitatively transfer,
2 answers
asked by
Jessica n
753 views
What precautions must be taken when you introduce the mixture of compounds to be separated onto the absorbent column
2 answers
asked by
James
725 views
What is a disadvantage of using pH indicators?
4 answers
asked by
*Sara*
706 views
When doing an experiment with a calorimeter why is important to keep the lid on?
5 answers
asked by
Cheryl
725 views
describe basic steps to take re-crystalizing synthesized aspirin. using two solvents to perform this task (ethanol and
2 answers
asked by
morgan
730 views
A buret (initial and final buret reading were 2.20 mL and 11.86 mL) was used to deliver a sample of 2.1E-5 M stock dye into a
2 answers
asked by
Mallory
709 views
During an experiment involving separation, you forget to label your beakers and you are unsure of which beaker contains the
3 answers
asked by
Rachel
712 views
2) why should you use a minimum amount of water to rinse the conical vial while transferring the purified acetaminpophen to the
2 answers
asked by
reem
689 views
What approach do you suggest using to prevent your water sample from cooling off before you start your measurements?
2 answers
asked by
Lilit***
665 views
A student was given 100mL of HCL solution in a 250mL beaker and told that the HCL was 0.11M. The student was also given
1 answer
asked by
Lenny
681 views
1. why is it necessary to use boiled and cooled water in the dilution of the carbonate sample?
2. an aliquot of the diluted
2 answers
asked by
angelo
686 views
How would you obtain a sample of the salt potassium chloride?
2 answers
asked by
Muhammad tanvir hussain
659 views
Which of the following statements are false regarding using a solid drying agent? (select all that apply)
a) Water can be present
2 answers
asked by
Rachel
683 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
el
669 views
I need help on my chem lab... I need to give you background info so you know how to help me..
Data Sheet: Specific gravity of
1 answer
asked by
Jennie
669 views
What is the purpose of removing all the precipitate from inside a beaker?
1 answer
asked by
Emma
624 views
Describe how you would prepare the following two solutions. Be sure to include the type of glassware which you would use and as
1 answer
asked by
Joe
649 views
A student began adding titrant to the acid solution, but stopped when she suddenly realized that she forgot to add the 3 drops
2 answers
asked by
Matt
644 views
Online chemistry lab preparing standards help?
I was told to prepare some standard for a chemistry lab and here where the
3 answers
asked by
Gweedo8
647 views
Three unknown solutions were prepared by pipetting 15.00 mL of an unknown nickel solution into a 200.00 mL volumetric flask and
2 answers
asked by
Christine
628 views
how to prepare 1L OF 0.5N HCl
2 answers
asked by
shazia
630 views
How to make 100 mL of 100mM of Tris HCl and 100 mL of 100mM of Tris Base. Follow the pH of the resulting combined solution as it
2 answers
asked by
Aarya Singh
612 views
Carborundum (silicon carbide) boiling chips are better than calcium carbonate chips in the recrystallization of an unknown,why ?
2 answers
asked by
david
630 views
Transfer the tablet to a clean 125-mL Erlenmeyer flask. Add 10-mL of 1M NaOH and heat the mixture to a gentle boil. Once the
1 answer
asked by
eng
608 views
An empty flask weighs 128.632g. After vaporization of a sample of volatile liquid, at a measured temperature of 99.8 C. The
2 answers
asked by
Anonymous
614 views
What improvements could i make to this lab? so far i only have that the graduated cylinder should be changed to a buret for a
5 answers
asked by
Kate
607 views
prepare some 0.1 HCl by diluting the appropriate volume of stock 'conc' HCl to 1L. The stock acid is 37.4% HCl by weight and has
2 answers
asked by
chris
607 views
assuming only glassware was supplied for the original experiment, what would be the procedural change necessary to titrate
2 answers
asked by
gladys
578 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
581 views
describe how you prepare a 250cm3 of 0.5M solution Na2C03.indicate the various laboratory apparatus you will use
3 answers
asked by
Dorcas
586 views
How to separate and isolate the components of barium sulfate?
2 answers
asked by
Hope
584 views
Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
A. The volume required
4 answers
asked by
Anonymous
599 views
Which of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
A. A blank is composed
3 answers
asked by
John
575 views
6 part question
1. describe the appearance of a Bunsen flame that is getting insufficient air? 2. describe the appearance of a
2 answers
asked by
Lisa
568 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
561 views
A stock solution was prepared by dissolving exactly 0.4000 g of pure ASA (180.16 g/mol)
in 10.00 mL of NaOH and heating the
2 answers
asked by
Tasha
558 views
So I did a titration experiment using 0.01 M potassium permanganate. In an erlenmeyer flask I placed a mass sample of FeSO4-
5 answers
asked by
ALex
571 views
why should samples be weighed rather than measured volumetrically when determining the acetic acidin vinegar
2 answers
asked by
nompumelelo
555 views
Why is it suggested you use weighing paper or a watch glass instead of filter paper on
which to allow a sample to dry? Please
2 answers
asked by
Maria
568 views
A laboratory technician is required to prepare a quarter normal saline solution (0.22% w/v) from the stock normal saline
3 answers
asked by
Korina
577 views
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