294 Answered Questions for the topic Chemistry Lab

Chemistry Lab

05/01/17

what is the percentage by mass of NaCl in a saturated solution of sodium chloride at 50 degrees celsius

I need to show work but I do not know how to work this problem out

04/10/17

Chemistry 1211 Post Lab question. Im stuck, please help!

1. Consider a possible explaination for the fact that the hydrogen spectrum shows four line in the visible region, helium shows eight, soduium shows two and neon shows sixteen.    2. Could... more
Chemistry Lab

04/09/17

What volume of 5% LiCl and water needs to be added to the 50 mL of 0.65 M LiCl solution to make up 100 mL of 0.5 M LiCl?

You need to prepare 100 mL of a 0.5 M solution of LiCl. You have 50 mL of a 0.65 M LiCl solution and 20 mL of a 5% (w/v) LiCl solution. • Molar mass of LiCl = 42.39 g/mol • % (weight / volume)... more
Chemistry Lab Chemistry

03/21/17

If you have a beaker filled with ice and you want to see what happens to the ice when you add salt, the ice and salt would be classified as the...?

This question is about chemistry and deals with labs and materials and I'm not sure what the question is really asking. Independent or dependent maybe? Please help. Thank you!
Chemistry Lab

03/14/17

What is the balanced molecular equation if you mix 5 drops of potassium iodide and 2 drops of silver nitrate

I have to write a balanced molecular equation after I mix 5 drops of potassium iodide and 2 drops of silver nitrate. 

03/09/17

Chemistry Titration

What is the molarity of NaOCl in a solution of bleach if 10.00mL requires 22.35mL of 0.02191M Na2S2O3 to reach the endpoint? Show work. Hint: Work through the I2 first.   Reaction Equations that... more
Chemistry Lab

03/07/17

what makes the difference in voltage output of a voltaic cell, if the chemical in the salt bridge is changed (KCl, KNO3, NaCl, NaNO3)?

The chemical is changed with KCl, KNO3, NaCl, NaNO3. So it has been found that the KCl has the most voltage output than the other chemicals. So why is that?

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?
Chemistry Lab

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
Chemistry Lab

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
Chemistry Lab

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
Chemistry Lab

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
Chemistry Lab

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
Chemistry Lab Biology Chemistry Vitamins

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. 
Chemistry Lab

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

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
Chemistry Lab Chemistry

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
Chemistry Lab

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
Chemistry Lab Chemistry

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

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