Introductory Courses

Writing a laboratory report (Detailed Explanation)

Writing a laboratory report (Detailed Explanation)

This is a great tutorial on how to write a lab report if you're just starting off in your studies...

See attachment

Bio_man

bio_man   5638   1 Reply

finndog32

I need advice on choosing a topic for my school project (high school)

I need advice on choosing a topic for my school project (high school)

I'd like to make a project in the field of nanobiotechnology. I'd be glad if you could help me choose a topic.

YTKAGLAMYR   75   1 Reply

bio_man

Chemistry lab - acid base titration

Chemistry lab - acid base titration

Did I do it right?



Results: Molarity of Na

Sadah_17   203   1 Reply

kdot14

How do I calculate Cfu/ml with a dilution?

How do I calculate Cfu/ml with a dilution?

We did an experiment where we did 10^-5 , 10^-6, 10^-7 dilutions. For the first tube of bacteria I grew 400 colonies on a plate after pipetting 100 ul onto the plate with a 10^-5 dilution, 40 for the 10^-6 dilution, and 8 for the 10^-7. How do I get

rimrod75   229   1 Reply

rillameister

Can someone describe to me about the Darkfield microscopy?

Can someone describe to me about the Darkfield microscopy?

I need to know how it works, the history, what it is used for, and the advantages + disadvantages of the dark field.

I'll need links and concise but not too short descriptions please.
Thanks to anyone who gives me info.

Smilez   230   1 Reply

n_m_m

How to do a 200:1 dilution of water: 49% HF?

How to do a 200:1 dilution of water: 49% HF?

SO I need to dilute some 49% HF in water. I honestly cannot remember how to set this equation up and the fact that it is 49% HF, it is throwing me off. I usually work with wt% and dilutions are not my expertise. Any help on how to set this up?
I shou

FF/EMT   241   1 Reply

nurkasih

Biology lab help please

Biology lab help please

What volume of liquid would be dispensed by 3 P200 set

Sadah_17   242   1 Reply

bio_man

Doing a chemistry lab?

Doing a chemistry lab?

I'm doing a lab for chemistry, and im stuck, I just need a little help figuring out what to do for a procedure, and how to get started.

We are given two different branded antacid tablets and the question is:
Find the percent composition and number o

ikim   246   1 Reply

ikk260

How to determine the osmolality of an unknown?

How to determine the osmolality of an unknown?

physiology lab.  dialysis sacs with unknown solution placed in 4 differnet jars containing 30% sucrose, 20% sucrose, 10% sucrose and 0% sucrose; the sacs in the  30% & 20% jars both lost weight, the 10% jar and the 0% jar both gained weight. determin

leelu   249   1 Reply

rimrod75

Chemistry help: How do you find the concentration of something given the following information?

Chemistry help: How do you find the concentration of something given the following information?

Hi there - for a lab we have to find the concentration of glucose and the concentration of NaOH in a culture tube given the following information

in the culture tube there are:

4 mL of .1M glucose
4 mL of .2 M NaOH
1 mL deionized water
1 mL methyle

rimrod75   250   1 Reply

juan123

Why does dilution of ethanol lower its mass?

Why does dilution of ethanol lower its mass?

My chemistry teacher diluted .3 mL of ethanol with water but she used too many drops, stupid ik lol. So when we heated the liquid to find the molecular mass the mass was way to low. She wants us to find out for ourselves why this excessive dilution l

nurhan   251   1 Reply

rimazx

700uL 1:75 solution. Can be used to make 500uL 1:100 and 500uL 1:125 solutions?

700uL 1:75 solution. Can be used to make 500uL 1:100 and 500uL 1:125 solutions?

For Vf=500 and DF=100, Vi=5 and Vf=500 and DF=125, Vi=4, 9uL of the 700uL 1:75 solution would be required for the two 500uL solutions. The initial solution concentration would be 100% for the two additional dilutions. They are not serial. Am I missin

O.G. Mann   251   1 Reply

bio_man

i need the equations governing the dissolution rate of limestone?

i need the equations governing the dissolution rate of limestone?

how can i calculate the dissolution rate of limestone sample?
(equations or lab. experiments) in details please

tomtom1234   255   1 Reply

darksith77

What was the purpose of the balloon on the glucose-yeast extract broth bottle

What was the purpose of the balloon on the glucose-yeast extract broth bottle

Can you answer this for me, I’m confused

Marianny   255   1 Reply

bolbol

How do you figure out concentrations after a solution has been diluted with water?

How do you figure out concentrations after a solution has been diluted with water?

So yah, I have some ammonia that had an INITIAL concentration of so much. Now, say I diluted that solution 1:10 with water. How would I calculate the new concentration? How does dilution effect concentration? For the future - what would I actually do

nuringstudent   256   1 Reply

nurisar

Why would molar conductivity increase in dilution?

Why would molar conductivity increase in dilution?

For strong electrolytes solution like HCl, and NaCl.
The molar conductivity of the solution is increase when the concentration of solution decrease. Why?
Not suppose to be dilution decreases the molar conductivity?

Professional please answer my ques

feyi44   260   1 Reply

tomtom1234

determining the concentration of a solution?

determining the concentration of a solution?

for my lab i have to write a procedure about how i would determine the concentration of a solution then perform that lab. but i have no clue to how you determine the concentration. the only information that i was given is that the solute is calcium c

zule   265   1 Reply

Nurs-4

Is there a website where I can find Larson's scientific and humorous cartoons?

Is there a website where I can find Larson's scientific and humorous cartoons?

I'm looking in particular for the one about prehistorical microscopy, where the caveman observes a mammoth under the microscope...
Thanks!

nuria   268   1 Reply

_vibram_

Microscopy.I am studying a protein,How do I prove that it is entering the nucleus, What kind of imaging?

Microscopy.I am studying a protein,How do I prove that it is entering the nucleus, What kind of imaging?

The protein is localized to the center of the cell when the cell is treated with a growth factor. I want to prove that the protein is entering the nucleus.  What kind of imaging can I do to show  that the protein is in the nucleus and not just above

nuringstudent   268   1 Reply

zuelion

help doing serial dilution, Describe how you would do the following?

help doing serial dilution, Describe how you would do the following?

Given a cell concentration of 5424 cells/microliter in a flask and 5 test tubes with 900microliter of sterile media, create a dilution series by using 5 sequential transfers with a 1/10 dilution for each transfer.

NURGirl   268   2 Replies

Juan Ma

what is the new molarity of 10 ml of 1M HCl after being titrated?

what is the new molarity of 10 ml of 1M HCl after being titrated?

so for my chemistry lab we have to calculate the Molarity of HCl after being standardized with NaOH. the molarity of NaOh was 0.4304M.

10ml of 1M HCl was titrated with the 0.4304M NaOH and reached the equaivalence point at 25.20ml.

how do i find t

smileyprincess111   269   1 Reply

JU

Can TEM be used for ultrastructural autoradiography?

Can TEM be used for ultrastructural autoradiography?

Does transmission electron microscopy have the capability to resolve deuterated or tritiated ultrastructure in cells or tissue? I would like to design a pulse chase experiment using radiolabeled phosphatidylcholine in tissue explants.

Juan Ma   271   1 Reply

Leendr

What would be a lab that tests for respiration in a small animal?

What would be a lab that tests for respiration in a small animal?

How would you prepare a lab where you test for respiration in small animals? How would you draw the experiment/system?

NursingMajor   272   1 Reply

bugbeany

What type of science experiment for an 8 year old?

What type of science experiment for an 8 year old?

My child must prepare a science experiment. This has to be ready in less than 3 weeks. I'm no scientist myself. Any suggestions for experiments that aren't too complicated? Thank you in advance.

Smorr   273   1 Reply

rivatayah

How do I dilute: 2mM of NaCl from 5M stock?

How do I dilute: 2mM of NaCl from 5M stock?

Just wondering how to dilute 5M of NaCl to 2mM, volumes could be anything, but its probably best not to have large volumes. I was thinking maybe a couple of dilutions? Thanks.

smilez4fun   273   1 Reply

nuringstudent

Which of the following is not true about a cell from an elephant?

Which of the following is not true about a cell from an elephant?

a) Its genome is composed of multiple linear chromosomes.
b) If the cell was examined under transmission electron microscopy, darker regions would indicate denser material.
c) It has a nucleus (and is therefore eukaryotic).
d) It has a Golgi apparatu

leelo   274   2 Replies

juana.masa

Which laboratory technique should be used by a biologist who wants to?

Which laboratory technique should be used by a biologist who wants to?

purify the chloroplasts from plants collected in the wild?

 A. Electron microscopy
   B. Freeze fracture
   C. Cell culture
   D. Cell fractionation
   E. Light microscopy

I'm just asking because I've looked everywere and I can't find the anwe

rinaann   275   2 Replies

zule

The lateral difision rates of membrane proteins that contain a fluorescent ligand can be quantified using a?

The lateral difision rates of membrane proteins that contain a fluorescent ligand can be quantified using a?

technique called

(A) Single Particle Tracking

(B) Hydrophobicity Plotting

(C) Fluorescence Recovery after Photobleaching

(D) PAGE

(E) Freeze Fracture Electron Microscopy

Please provide some explanation. Thank you.

__Aycee   277   1 Reply

leeleez

How would you design a lab to find the concentration of a solution?

How would you design a lab to find the concentration of a solution?

We are given a prompt in chemistry to give a procedure to find out the concentration of salt in a sample of saltwater. We have to find out the concentration (or just how much salt there is) in a 50mL sample of saltwater from a fish tank. We can use a

smileyprincess111   278   1 Reply

nurazije

How do you do these problems that deal with diluting a solution?

How do you do these problems that deal with diluting a solution?

To make 72 mL of a 7-fold dilution of an original solution, what volume of the original solution should you use for this dilution?

To make 87 mL of a 25-fold dilution of an original solution, what volume of a diluent should you use?

tomtom1   279   1 Reply

Zug

Calculating cell concentration at different dilutions?

Calculating cell concentration at different dilutions?

I'm working on a lab now, and I need some help with the calculations. It says: "The initial concentration of ADP1 cells in the lysis buffer was 5x10^8 cells/ml. How many cells should have been available in 0.1 ml of this solution at 10^-5 dilution?"

tom_andrews   281   1 Reply

nurazije

Why is it important to use the correct dilutions of medicines? (More questions too)?

Why is it important to use the correct dilutions of medicines? (More questions too)?

Why is it important to use the correct dilutions of medicines?
Why (and how) does dosage vary with age?
What problems might arise if a dose is too low, or too high?
Thanks in advance, I can't find this information anywhere!

o.avworo   281   2 Replies

Ikkou

If I were to find a jug of something that says it's HCl, how can I test to see if it actually is without a lab?

If I were to find a jug of something that says it's HCl, how can I test to see if it actually is without a lab?

I found a large glass jug that says it has a 38% concentration of HCl in it, is there any way to test to see if it actually is HCl assuming I don't have access to a lab?
found a large glass jug that says it has a 38% concentration of HCl in it, is th

Juan Ma   281   1 Reply

rillameister

How would I solve for the unknown in a titration lab?

How would I solve for the unknown in a titration lab?

I'm struggling with this titration lab due tomorrow, please help!!!

Trial 1: .15ml  of the unknown, 40.60 ml of NaOH was used
Trial 2: .15ml of the unknown, 42.20ml of NaOH was used

Balanced Equation _H2SO4(aq) +  2NaOH(aq) ---> 2H2O (L) + Na2SO4(S

tomy_uos   281   2 Replies

smilingdeep22

How can I tell the difference between a plant and animal cell picture that is 15,000x microscopy?

How can I tell the difference between a plant and animal cell picture that is 15,000x microscopy?

I have a picture in Bio lab book that asks animal or plant cell. It is a transmission electron microscope picture of a cell. Can you help?
I think the problem I'm having is the fact that the picture is not visualized on a light microscope, but is vsu

Fezenius   283   1 Reply

tom_andrews

Can someone please explicitly derive the answer ?

Can someone please explicitly derive the answer ?

In a hospital lab,10mL of gastric juice,obtained after several hrs of meal was titrated with 0.1M NaOH to neutrality;7.2mL of NaOH was required.The patients stomach had no ingested food or drinks.Assume that no buffers were present.What was the pH of

smileyprincess111   283   1 Reply

tomy_uos

What is the molarity of 10mL of HCl in 20mL of H2O, and 4.2mL NaOH in a neutral solution?

What is the molarity of 10mL of HCl in 20mL of H2O, and 4.2mL NaOH in a neutral solution?

I can't figure out how to calculate this problem for my Titration Lab Report.

HCl + NaOH NaCl + H2O

the molarity of the NaOH is  approx .1M

Nurnin   283   1 Reply

juan.garza555@gmail.com

What is the best way to handle 5,000 gallons of copper containing waste ?

What is the best way to handle 5,000 gallons of copper containing waste ?

What is the best way to handle 5,000 gallons of copper containing waste ?
Dilution ?
Incineration ?
Reclaim using solids ?
Reclaim using liquids ?
Please give me a claim , evidence , and a ton of reasoning's with the words products, reclaim, recycle

nzegbuna.ify   284   1 Reply

Rima5879

What is the effect of dilution on conductance?

What is the effect of dilution on conductance?

what is the effect of dilution on conductance and why? Please explain Clearly. Thanks everyone in advance.
It is a weak acid. I need dilution effect on specific, molar & equivalent conductances in detail.

smmoh4   285   1 Reply

tonih79

What is a bacterium (of mouth that is mostly targeted by mouthwashes)that can be easily acquired for labs?

What is a bacterium (of mouth that is mostly targeted by mouthwashes)that can be easily acquired for labs?

Doing a lab on the effectiveness of different mouthwashes; instead of just testing saliva, I want to find a specific type of bacterium that is most common in mouths..something that is widely available to perform labs?

smkemper   286   1 Reply

smn