lab

  1. P

    Chemistry unit lab problem

    Hi everyone, Wondering if someone could help me with this lab problem. I can't get my head around it. NaOH= 40,00g/mol p = 2,10 g/cm3 I want 100 ml aq with 0,400 mol/kg How do I solve this? Thanks in advance:)
  2. M

    Help chemistry lab!!

    Hi We did a chemistry lab and have some questions after to submit and I’m really stuck and baffled one a few of them so I’d really appreciate some help and guidance. 5.Is the 2-nitrobenzaldehyde used in this experiment an example of an ortho or para substituted benzene molecule? What does this...
  3. M

    Help with chemistry lab!

    Hi We did a chemistry lab and have some questions after to submit and I’m really stuck and baffled one a few of them so I’d really appreciate some help and guidance. 5.Is the 2-nitrobenzaldehyde used in this experiment an example of an ortho or para substituted benzene molecule? What does this...
  4. Sammy

    Lab Question

    I have to do a chem prelab for this week and two of the questions ask for specific reasons behind the procedure and method. Part of the lab procedure is to find the mass and volume of three glass rods- one small one, and two large ones with different lengths. Another step is to find the mass and...
  5. S

    Lab Safety Questions

    Hi Everyone. My name is Thomas and I am in my first ever chemistry class at my city college. Happy to be a part of the forum; I find forums to be very useful. A bit of an embarrassing question(s) that was not covered in class but presented on a Lab Safety quiz. I came here because I was unable...
  6. T

    Help with Organic Chemistry Lab

    For my Organic Chemistry lab, we are synthesizing esters via microwave-assisted Fischer esterification. My task is to synthesize n-butyl benzoate. The procedure provides us with two options, either use excess alcohol or excess carboxylic acid to obtain the highest yield and purest product. We...
  7. S

    Chemistry unknown lab please help anyone please

    I'm absolutely lost on my lab. We were given a 125 mL solution containing anywhere from 2-7 different ions, with at least 1 cation and 1 anion. We are required to run specific tests to see what each of our substances mimic, but I have found that it doesn't match ANYTHING that I previously have...
  8. H

    Need help with Chem Lab!

    Hello everyone! Hopefully all of my fellow Americans have been enjoying a nice Thanksgiving break, and well.. everyone else... I hope you have been having a great week! Anyway, I need some major help with my Chemistry lab. Essentially we did the lab in school, and we had to answer questions...
  9. M

    Voltaic Cell Lab

    Hello I need help. I have done a lab on how temperature affect the cell potential of a voltaic cell. I have changed the temperature and graphed cell potential against temperature. I am not sure what the slope shows. Can anyone help me please. I looked at it by doing the Nernst equation which...
  10. A

    URGENT: Lab Explanation!!!

    I just conducted a lab in which I am testing varying amounts of magnesium to react with a consistent amount of hydrochloric acid, determining which amount of magnesium produces a reaction whose enthalpy is the closest to the theoretical/ideal enthalpy of this equation. I created 3 conditions...
  11. W

    Inquiry lab inorganic compounds

    Hello, I am having a problem with the following: I need to find a way to identify 3 given solid compounds as either salt, hydroxide or acid. I would start with measuring pH after dissolving in water. Low pH would mean it s no hydroxide, but it can still be an acid or a salt. Then I would...
  12. C

    Lab Reports!!!

    I am going to be a chemistry TA this upcoming year but I was told that I need at least 10 completed lab reports (high school level) in order to become a TA. I've been looking around all summer but none of my friends have any and no teachers have any. I would have done them myself but due to...
  13. R

    Help with Lab Question

    Need help/explanation... given 1L of 0.5M of both NaClO and NaS2O3, what is the equation for reaction between 5mL NaClO (Sodium Hypochlorite) and 45mL Na2S2O3 (sodium thiosulfate) with depreciating mL values of 5;45, 10;40, 20;30, 30;20, 40;10, 45;5 with each other without the presence of other...
  14. H

    Titration Lab Report... Please HELP!!! Urgent!!!

    In school we performed a titration lab. The objective was to test a few characteristics of weak acid / strong base titrations and buffer systems. It also was conducted to determine the pH at equivalence, to demonstrate buffer capacity, and to be introduced to the techniques necessary for...
  15. L

    Lab Assignment heat of fusion/vaporization

    Hi. I need help with a lab assignment. The assignment consisted of measuring the temperature change of ice to demonstrate phase changes. But the directions for calculating enthalpy don't make any sense at all. According to the lab assignment, to obtain the heat of fusion, I must divide time...
  16. H

    Stoichiometric Virtual Lab Help?

    Hey, I'm new here! Anyway, I'm doing a virtual chemistry lab on stoichiometric. I have completed the actual experiment; what I'm stuck on are the questions. Here is one of the questions: Below is the balanced equation for the reaction. Review the results of your...
  17. S

    Help with Equilibrium Lab Problem

    PLEASE READ THE INFO FIRST THEN HELP ANSWER MY QUESTION AT THE END THANKS. This lab consisted of two parts. The first part procedure : 1. Use a buret to transfer exactly 4.0 mL of 0.0025 M solution of Fe(NO3)3 (in 0.10 M HNO3) to a 100-mL volumetric flask. 2. Now obtain about 100 mL of...
  18. K

    acid base lab help please

    Using 0.3638 M of NaOH solution, calculate the % acetic acid (BY MASS) in each of these 3 samples: 23.69 mL, 23.59 mL and 23.99 mL total mass of each 25.00 mL sample is given by: total mass=density x volume. Assume density of the acetic acid solution is 1.000 g/mL I know to start out with the...
  19. M

    A Few Questions OchemII lab

    I'm studying for my lab final, and am doing some practice /review problems. 1. The yield of triphenylmethanol is 30%. Give 2 reasons why the yield is low. Assume no mistake is makde, glass is dry, and oxygen side rxn is regligent. (Shows a grignard rxn). Okay, so I put that 1. although the...
  20. S

    Lost in my bio 113 (but actually chemistry) class?

    Hi! So I'm enrolled in a biotechnology summer institute at my community college this semester and the first day they tossed us right into something we weren't expecting - Chemistry. After all, the class we're enrolled in is Biology 113 and Bio 113 lab. So needless to say, myself and my entire...