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Laboratory Techniques
Page 3
Questions (370)
You are worried that a solid substance has to evolved in a beaker of water in a lab what way could you separate the substance
2 answers
asked anonymously
46 views
summarize this:
In this video I'm going to go through is how to do a titration and also the calculations that are involved in a
1 answer
asked by
Rondezy
89 views
Function of a condenser in simple distillation
1 answer
asked by
Romeo
77 views
Why do we need to heat the sample slowly to record its melting point?
1 answer
asked by
Momna
90 views
How to find solvent volume for recrystallization?
1 answer
asked by
Momna
87 views
Dry potassium acid phthalate (KHC8H4O4) for one hour at 110°C and cool. Accurately weigh 2.00 to 2.05 gms of the sample to four
1 answer
asked by
Jenneh A. Soko
78 views
Which arrangement of the steps is the most logical?
I. Your eyes must be at the level of the graduated cylinder. Do not pick it
4 answers
asked by
Francine
258 views
Propose a method for how you might accurately measure the boiling point for a material that decomposes slightly below its
1 answer
asked by
Mark
327 views
Prepare 10 ml of 1% (w/v) stock solution of KMno4
4 answers
asked by
Hk
785 views
Procedure in preparing solution for 250.0 mL of 0.2500M cupric sulfate solution from anhydrous cupric sulfate. Assume
100%
3 answers
asked by
df
543 views
Which of the following steps is appropriate for preparing a wet mount slide?
(Select all that apply.) Lower the coverslip onto
3 answers
asked by
dianni
1,773 views
5. In order to control for abiotic processes in chemical assay, it is essential to include:
Select one: a. A non-inoculate
2 answers
asked by
Karmen
603 views
you ask your lab assistant to prepare IL of solution Zeta at a concentration of 1M. He comes up to you with a 0.5M stock
3 answers
asked by
Maria
695 views
Understand concept of isolating a pure culture for identification and enumeration.
5 answers
asked by
Eron Kavisai
40 views
So I have a lab exam tomorrow and our instructor said that one of the questions would be as follows:
Prepare 100mL of 0.03 M
2 answers
asked by
Jake
793 views
did a lab on separation of salt and sand. the initial mass that my teacher gave me was the stock mixture that was: salt= 54.79g;
2 answers
asked by
Annon
559 views
Describe the steps (and the glassware used) to making 100 mL of a 1 M Tris pH 7.8.
1 answer
asked by
Kasei
294 views
Describe the steps (and the glassware used) to making 100 mL of a 1 M Tris pH 7.8.
3 answers
asked by
Kasei
389 views
Why we cool the tube in anthrone test then observe the color
4 answers
asked by
Zahraa
368 views
If you have fluid in the pipet tip and want to expel it all, should you only depress the plunger to the first stop or should you
3 answers
asked by
Anonymous
419 views
Why was NaOH used in an Biuret test to run a experiment
1 answer
asked by
rajeana
405 views
why do we use glycerol bath instead of water bath in melting pt determination?
if glycerol were no available, what can we use
2 answers
asked by
resheyl
832 views
i want secondary antibody dilution in 1:15000 in PBS. How i should do it
2 answers
asked by
ALOK
532 views
Why is it important for the reaction beaker to be completely dry before weighing?
1 answer
asked by
Anonymous
457 views
need help on a lab
here are the results Mass of empty beaker and glass rod(62.62) Mass of beaker, glass rod, hydrated copper
5 answers
asked by
Katherine
667 views
I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve
3 answers
asked by
Ashley
502 views
If BaSO4 ppt is isn't washed or dried adequately how will this effect the sulfate percent error determination?
1 answer
asked by
Bill
401 views
filter paper is a poor material on which to powder a solid before introducing it into a melting tube .explain why?
2 answers
asked by
inise
538 views
You are planning to digest human genomic DNA with the EcoRI restriction enzyme but realize you do not have any 10X buffer
2 answers
asked by
D.
504 views
A stock solution of ethanol is made by weighing out the correct amount of absolute ethanol in a tared beaker containing 15 ml of
1 answer
asked by
puzzled
431 views
In the laboratory process of isolating Eugenol from cloves via a steam distillation, extraction, drying, and final distillation
1 answer
asked by
BigBlue
437 views
We will need 0.5L extraction buffer with 25 mM HEPES, 1 mM EDTA, and 1 mM DTT. Please calculate how many grams of each solute
3 answers
asked by
Amanda
406 views
You are doing a red blood count with a standard dilution of 1/200. The area counted is 10 red squares in a Neubauer chamber.
1 answer
asked by
Anon
386 views
Give me a process for preparing an inorganic dye in school lab.
1 answer
asked by
kawal
272 views
can u help me in explaining why we used 5ml instead of 55.00ml of acetic acid on our calculation in titration ?
1 answer
asked by
dyana
268 views
In the experiment of buret calibration, what is the importance of having total buret correction? And does the density of the
1 answer
asked by
xavier
354 views
Laboratory preparation of carbon dioxide?
1 answer
asked by
Lalan patel
359 views
The molar mass of an unknown organic liquid (M~100) is determined by placing 5 mL of the liquid in a weighed 125-mL conical
1 answer
asked by
Someone
880 views
The molar mass of an unknows organic liquid (M~100) is determined by placing 5 mL of the liquid in a weighed 125-mL conical
1 answer
asked by
Ash
802 views
This is the homework exercise:
You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of
1 answer
asked by
Remy
278 views
The forward primer was provided by the manufacturer as a lyophilized powder. If the manufacturer delivers 127.4 nmoles of this
3 answers
asked by
JEQPCR
1,560 views
what do we need to consider when choosing a solvent to heat under reflux?
Would one be the boiling point of the solvent?
2 answers
asked by
Anonymous
538 views
do you know how much drops of dcpip is required to make .9 , .6 , 1.1 and .8 cm squared
my partner and i frogot to write down the
1 answer
asked by
Anonymous
361 views
Appreciate if you could help me answering the following questions! thank you!!
How would you prepare a 20% homogenate from a 2.0g
1 answer
asked by
Becky
308 views
Appreciate if you could help me answering the following questions! thank you!!
How would you prepare a 20% homogenate from a 2.0g
1 answer
asked by
Becky
415 views
What gases escaped during the sodium bicarbonate washing for the preparation of Synthetic Banana Oil lab. The isopentyl acetate,
3 answers
asked by
Vai
1,376 views
During an experiment, a student uses a beaker to measure the volume of a weak acid. When the experiment is over, what should she
3 answers
asked by
needapass
58 views
Please can anyone help me with the following:
Filter paper is a poor material on which to powder a solid before introducing it
1 answer
asked by
Ahana
372 views
Laborant got a task to make a buffer, which pH = 8.00. Which same concentration solutions and which ratio would you suggest him
5 answers
asked by
Anonymous
299 views
i ppted out iron(111) form a solution and weighed the ppt. then dissolved the ppt in a solution and run in an aas and get the
1 answer
asked by
didymus mupambo
442 views
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