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Laboratory Techniques
Page 5
Questions (371)
How would you make a serial dilution if you have a starting value 100mM of X
The are the values of X show different dilutions. I
1 answer
asked by
tatiana
520 views
In my bio lab we are creating serial disk dilutions (100mg, 300mg, 500mg) from a plant extraction sample.
Wood sample #1 (7mL of
1 answer
asked by
Ali
498 views
should you use decolorizing charcoal before allowing the hot solution to cool in? Explain
Your answer is here.
1 answer
asked by
sheri
553 views
The preparation of “azo” dyes often does not work well in the laboratory. Although the correct colour is usually apparent,
1 answer
asked by
Lindz
399 views
Question: When a TLC plate ws developed, the solvent front ran off the top of the plate. What should be done to correct the
1 answer
asked by
Sheryl
1,081 views
I used a filter paper that was too large for the Hirsch funnel and had to
fold it up around the edges. Why is it bad to fold the
1 answer
asked by
Cecilia
695 views
How do we measure solubility of substance in laboratory
1 answer
asked by
Kelvin
19 views
Give details procedures to prepare stock solution
1 answer
asked by
Kelvin
32 views
Give details procedures to prepare sample for analysis
1 answer
asked by
Kelvin
30 views
Explain the common stapes of Washing glassware and plastic ware In laboratory
1 answer
asked anonymously
32 views
Explain the common stapes of Washing glassware and plastic ware
1 answer
asked anonymously
28 views
A student obtained a clean, dry glass- stoppered flask. She weighed the flask and stopper on an analytical balance and found the
4 answers
asked by
Alan Anderson
2,156 views
If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration
for the
3 answers
asked by
help
2,075 views
a crude non acidic product mixture dissolved in diethyl ether contains acetic acid. describe an extraction procedure that could
3 answers
asked by
Jason
2,058 views
what test would you need to perform to prove that it is the combination of glucose in the glucose indicator solution that
3 answers
asked by
Guest
1,889 views
When filling the buret with NaOH solution, you left an air bubble in the buret tip. The bubble was released durning your first
3 answers
asked by
Diane
1,839 views
Why is it important to use the same pipet through out the experiment?
4 answers
asked by
Jimmy
1,673 views
In a laboratory setting, how would you determine if a compound was a hydrate?
4 answers
asked by
Astrid
1,525 views
An Erlenmeyer flask containing a hot solution is not tightly stoppered to prevent solvent loss during cooling. give reasons.
4 answers
asked by
david
1,491 views
Please can anyone help me with the following:
Filter paper is a poor material on which to powder a solid before introducing it
5 answers
asked by
Ahana
1,464 views
Explain how you would prepare 100.0 mL of 0.500 M NaCl solution. Include the appropriate glassware and calculations.
3 answers
asked by
Dee
1,447 views
You are asked to go into the lab and prepare an acetic acid-sodium acetate buffer solution with a pH of 5.43 ± 0.02. What molar
4 answers
asked by
Anonymous
1,470 views
Precautions to be taken while performing serial dilution
1 answer
asked by
Kelvin
40 views
What is serial dilution and provide an example you might use in the laboratory
1 answer
asked by
Kelvin
95 views
A laboratory technician measures 48 ml of urine sample in a 4-ounce beaker. How many more ml of urine are necessary to fill the
1 answer
asked by
hj
38 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
4 answers
asked by
ChEm
1,339 views
Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
A. A blank is composed
7 answers
asked by
uci student
1,342 views
You extract the iron from a tablet and dilute that to 600.0 ml in a volumetric flask. You transfer 0.600 ml of this solution to
2 answers
asked by
leigh
1,255 views
What is the purpose of removing all the precipitate from inside a beaker?
1 answer
asked by
Emma
1,212 views
I did a lab where I had to decompose the compund patassium cholorate (KClO3)by heating,I had to weight the test tube then the
3 answers
asked by
Sheryl
1,226 views
Why is it necessary to wait until the filter paper containing a compound is completely dry before weighing it? and how would it
2 answers
asked by
grace
1,181 views
Problem Description:
You are a workstudy for the chemistry department. Your supervisor has just asked you to prepare 500mL of 3M
3 answers
asked by
Urgent!
1,180 views
The weight of dry acid are measured to the nearest milligram; however the volume of water in which it is dissolved is never a
2 answers
asked by
Lamis
1,169 views
Write a laboratory report on standardization of NaHCO3 using a 10ml graduate cylinder measure 10.0 ml of the acid solution and
1 answer
asked by
Nathaniel Benson
29 views
What's your Laboratory observations using a 10ml graduate cylinder measure 10.0ml of the acid solution and transfer the solution
1 answer
asked by
Nathaniel Benson
31 views
lab question: explain why different masses of precipitate were obtained for test tube IV and V?
7 answers
asked by
ekauwen
1,092 views
How would you prepare 500 ml of a 1.8 M phosphate buffer (pH 6.8) containing 4.5 x 10-6 M CaCl2 and 52 mM sucrose?
2 answers
asked by
steven
1,055 views
A student cleaned a crucible with HCl. After pouring the HCl into the waste container, the crucible was neither rinsed with
2 answers
asked by
Sandy
1,042 views
An unknown was prepared with the concentration of 0.000331 M. A Beer's Law plot was prepared using the absorbance values from
1 answer
asked by
jared
1,013 views
Briefly explain separation funnel
1 answer
asked by
Oluwademilade
26 views
An unknown was prepared with the concentration of 0.000520 M. A Beer's Law plot was prepared using the absorbance values from
2 answers
asked by
bon
1,006 views
A "Bayer brand of aspirin was dissolved in some sodium hydroxide and transferred to a 100.0 ml volumetric flask and diluted to
3 answers
asked by
chemgirl
949 views
Determine the volume of diluted nitric acid d= 1.11g/ml, 19% hn03. That can be prepared by diluting with water 50ml of conc.
4 answers
asked by
Fai
915 views
Can you tell if Beer's Law holds for your stock solutions as well as in the calibration range? Why or why not?
(P.S. this is a
7 answers
asked by
Suzy
921 views
A student prepared 5.00 mL of borax solution at 59.2 C. He diluted the solution in a flask and titrated it to an endpoint with
2 answers
asked by
Anonymous
918 views
A student placed 12.5 of glucose () in a 100.- volumetric flask, added enough water to dissolve the glucose by swirling, then
2 answers
asked by
tomi
920 views
Why is it important to use liquids with relatively lower boiling points when using the Dumas method?
2 answers
asked by
Help
901 views
You need to make 50 agar plates. Each plate holds 30mls. Final agar concentration is 2.5%. How much agar powder to you need?
1 answer
asked by
Anonymous
903 views
What do scientists use gram staining for?
1 answer
asked by
gOt MiLk
29 views
Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?
2 answers
asked by
Jessi
834 views
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