288 Answered Questions for the topic Chemistry Lab

04/15/18

What causes vitamin C concentration to increase in freshly squeezed orange juice?

Hi. In year 13 Chemistry we titrated an iodine solution with freshly squeezed orange juice which had been stored at different temperatures. We keep the orange juice solution in an incubator to... more

04/11/18

how does impurities affect filtration and drying of aspirin

I need help with this question

04/11/18

describe the factors that influence purity in filtration and drying.

I need help with this question.

04/10/18

Chemistry Lab - Molality of a Solution

Hello,   I am finishing up my chemistry lab,  and am having trouble solving a question.  I clearly am missing something here, but I cannot figure out what it is.   The question... more

04/10/18

how does the lattice structure cause impurities?

I need help

04/08/18

if no sugar was removed at any time, why did the molarity of the 2L solution change compared to the 1L solution

use the words solute and solvent in your answer 

04/04/18

Chemistry lab help, Simulating an air bag with HCl and Baking Soda.

I have a .946L ziplock bag. I have to combine the proper amount of HCl and NaHCO3 in the bag for a lab to fill the bag enough so that it is plump but will not pop. The temperature of the room will... more

04/03/18

Its a multiple choice I have C,D,F,G right now a classmate has C,D,E....help ? PLEASE RESPOND QUICKLY

A 35g piece of  copper is warmed 45 to 55 C and placed in beaker (A) containing 100ml of alchohol at 25C. A 3tg sample of liquid water is warmed from 45 to 55C and placed in a second beaker (b)... more

03/28/18

explain how the yield, purity and atom economy of the substances prepared may be affected by changes to the methods used

I need help with this experiment how do I relate this to ethyl ethanoate and aspirin experiment 

03/26/18

Chemistry magnesium reaction with HCI

0.0367g of magnesium to produce hydrogen gas collected over water at 24°C and 746mmHg atmospheric pressure. volume of the collected gas was 46.3mL, what is the value of the gas constant, R?Percent... more

03/20/18

Mass of Aspirin in a tablet

In a lab determining the mass of acetylsalicylic acid in an aspirin tablet, I'm having trouble with the dilution part of my calculation.   An unknown solution was made by placing an aspirin... more

03/16/18

I need help with five chemistry questions

I need help with 5 chemistry questions and would need work to be shown. A. Measure out 0.130 moles of salt (NaCl) into a blue, dry cup. You need to convert to mass in grams. Show work:B. Put... more

03/15/18

Measure out 0.210 moles of salt (NaCl) into a blue dry cup, you need to convert to mass in grams. Show work:

I need work to be shown. I would also need help with these two questions. Put 2.85x10^23 molecules of water into a clear cup. You need to convert to mass in grams. Show work:

03/12/18

How is it possiable that a reaction can be both synthesis and redox

Chemsidbsjs. When’s d SJSU’s s shsndd

03/05/18

How do I use the ideal gas relationship to determine the experimental volume of CO2 at STP?

Average volume of CO2 in the experiment was 37.68mL. water temp 20.08 C vapour pressure of water 17.7 mmHg Barometric pressure 758.3mmHg   P1V1/T1  = P2V2/T2   I know I have to rearrange the... more

03/01/18

Total amount of moles in water in a beaker

Chemistry assignment 

03/01/18

Relative error to absolute error?

I'm asked to use the relative error to find the absolute error of [Na2S2O3]I've calculated these amounts in previous questions:[Na2S2O3] = 0.01001MRelative error: 0.3%is there other information I... more

03/01/18

How do I write the reaction for the oxidation of copper metal to copper ions in aqueous solution?

It’s for my chemistry lab. I don’t know  how to do it 

02/28/18

Titration problem

25.0 mL of phosphoric acid (H3PO4) solution with an unknown concentration is titrated with a 0.100M solution of NaOH. It takes 35.42 mL of the NaOH to reach the end-point. What was the... more

02/27/18

What observation can be written from a white ring formed from ammonia and hydrochloric acid by diffusion?

I need help on how to summarize my observation and discussion in my chemistry lab on an experiment we did in the lab about diffusion where a white ring was formed when two wool was soaked in... more

02/25/18

Whats the correct way to approach this concentration question?

Part I. Preparation of a Fe(III)-oxalate complex: (4 pts) a) Recorded mass of Fe(NH4)2(SO4)2●6H2O used: 1.3807 (g) b) pH paper color upon addition of oxalic acid: Magenta c) Does this color... more

02/25/18

How many tablets?

 A good yield for their synthesis, 0.763 g. How many tablets of aspirin could they make from this? There are 324 mg aspirin/ tablet.

02/21/18

Diels-Alder Lab Question

Do you expect there to be differences in the IR for the carbonyl stretches of maleic anhydride and the Diels-Alder adduct? If so, draw their structures and state which one you would expect to have... more
1 3 5 6 7 12

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.