288 Answered Questions for the topic Chemistry Lab

02/27/17

How do I tell the difference with an IR spectrum of 2-hexanol and 1-hexanol?

  It seems like the OH peak is less intense on 2-hexanol...why?

02/21/17

ln(k/0.006104)= .001236

Have been solving this equation (arrhenius) and have gotten stuck at this point. How do I deal with the ln and solve for k2?   The whole of the equation without the math I did would be ln... more

02/13/17

How do you calculate delta[h2o2] using a reaction equation?

This is a "Kinetics of Hydrogen Peroxide Oxidation of Iodide" lab, and the table requires me to solve for ΔH2O2 using a chemical reaction equation. I do not know how, and I need that to compute the... more

02/13/17

which measuring devices could you use to transfer 50.0mL of a liquid? Explain.

 what measuring could be used to transfer a 50.0ml liquid and why

02/11/17

Do you think it would be a good idea to estimate rather than weigh the amount of chemicals needed for an experiment? Explain

Do you think it would be a good idea to estimate rather than weigh the amount of chemicals needed for an experiment? Explain

02/05/17

Gas Chromatograghy

If a sample is made using 0.145g of methanol and 0.554g of ethanol, what percent of the total peak area is expected for the methanol peak (that is, what is 100*(area of methanol peak/(area of... more

02/05/17

How do I get the calorimetry constant from lab data?

https://i.stack.imgur.com/QjzTv.jpg    Constant should be around 30-85, i know it's mass x specific heat x delta t + mass x specific heat x delta t = 0 but I don't know how to make my equation... more

01/22/17

Make 250ml of a 0.15% H2O2 solution. You will be provided a 1.875% solution of H2O2.

show all calculations and explain how I would get the answer with this information. 

01/22/17

calculate how many ml of 3.0% h2o2 to use to make 500ml of 1.0% h2o2.

Show all calculations

01/05/17

Is there a way to calculate yourself the content of vitamin B12 of a food?

I really need to know if it's possible to calculate the amount of B12 existent in different foods, is it possible to calculate it myself? I can't just research it on the internet. 

12/01/16

i have a question on this

Given the true mole masses of CuSO4 (160 g) and H2O (18 g), how could you find the exact formula of the hydrate from your experimental data? That is, how could you find the value of x in the... more

11/25/16

Finding how high a column of water in meters can be with the density of water and mercury

I'm struggling to understand what the question is asking me and what concepts it is trying to test...    If the density of water is 1.00g/mL and the density of mercury is 13.6g/mL, how high a... more

11/23/16

Calculating Enthalpy in a Calorimeter Experiment

When 25.0 mL of 1.0 M H2SO4 is added to 50.0mL of 1.0M of NaOH at 25.0 degrees C in a calorimeter, the temperature of the aqueous solution increases to 33.9 degrees C. Assuming that the specific... more

11/21/16

balanced combustion reaction for C6H6

Equation: 2C6H6(l)+15O2(g)--> 12CO2+6H2O(l)_6542 KJ   If 5.900g of C6H6 is burned and the heat from the burning is added to 5691g of water at 21 degrees Celsius, what is the final temperature... more

11/17/16

Titration Calculation?? PLEASE HELP!!

Suppose our unknown acid was acetic acid, CH3COOH (Ka = 1.8 x 10-5) and that your initial aqueous solution contained 0.100 mol of acetic acid in total volume of 100 mL.To this acetic acid solution... more

11/17/16

How do I make a buffer with buffer capacity of 35.0 mM?

I have to make a buffer with a pH of 7. The solution's buffer capacity has to be 35.0 mM. Then I have to calculate how many mL of .1 M HCl will break my buffer. The professor will come around and... more

11/14/16

What is heat and temperature

What Is heat and tenperature

11/14/16

Calculate the experimental specific rotation (°) of the equilibrium mixture of α- and β-lactose

Calculate the experimental specific rotation (°) of lactose at time equals zero (t = 0)=87Enter the observed rotation of the equilibrium mixture of α- and β-lactose (°)=5.2 Calculate the... more

11/12/16

Beers Law plot

I had to constructed a Beers Law plot for my graph (absorbance vs. concentration) I'm supposed to find the molar extinction coefficient from the slope. Well the slope of the line is... more

11/12/16

Spectrophotometric lab

A test for drug use involves addition of 10.00mL of colorless reagent to 10.00 mL urine. If drug residue is present in the sample the solution turns blue(λmax = 605 nm, ε = 18,200M-1cm-1). Because... more

11/07/16

Why does each gas show a colour only when electricity was passed through the discharge tube

we used an apparatus containing a power source and gas discharge tubes we then looked through diffraction grating and observe the spectra produced by each gas discharge tube

11/07/16

What do the different colours in a line spectrum represent?

grade 11 chemistry lab on atomic emission spectrum

11/06/16

Percent yield & Limiting reagent

If a students adds three times as much phenanthroline than she was supposed to when attempting the red crystal synthesis how does this effect the actual, theoretical and percent yield?

11/02/16

Of all the measurements required to determine the delta H reaction which is likely to produce the greatest error and why

The lab's topic is Hess' Law and Calorimetry and the objective is to determine the heat formation of MgO using calorimetry and Hess' Law. 

11/01/16

I have a chem lab due and it gives the following reaction Cu(s)+4HNO3(aq)->Cu(NO3)2 (aq)+2NO2(g)+2H2O(l)

then theres a chart and it asks for the mass or volume to be used or produced (g or mL) , Molar mass(g/mol) Molarity and diluent (if a solution) and moles used or produced. IDK where to get these... more
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