304 Answered Questions for the topic Chemistry Lab

multiple choice HCL + carbonate/nitrate question

31 A mixture of solids is treated with an excess of dilute hydrochloric acid. A colourless gas is evolved and a white precipitate forms. What are the solids in the mixture?   A calcium carbonate... more
Chemistry Lab

08/27/17

When a student was making his volumetric solution using the 100 ml volumetric flask, he filled the flask past the mark.

a) How would this affect the molarity of his solutions? e.g. would the actual molarity be higher or lower than the calculated molarity? Explain. b) How would this affect the density of his... more

Sodium benzoate in carbonated beverages

Sodium benzoate is a common food preservative and can be commonly found in the ingredient list of carbonated beverages. Carbonated beverages also contain phosphoric acid and are highly acidic.... more

Write a balanced equation

What would be the balanced equation for the synthesis of benzoic acid using the Gignard reagent, phenylmagnesium bromide? 
Chemistry Lab Science Chemistry Water

08/06/17

how to calculat temporary hardness water and permanent hardness of water and total hardness and normality can anyone help me to find solution

how to find hardness of water and normality in calculation

08/05/17

Percent yield/ Theoretical Yield

I was trying to figure out the limiting reagent of a reaction that I did in lab. The reaction is 1-phenyl ethanol that is oxidized to acetophenone using (5% aq. NaOCl (2.2 equiv)) and (HOAc (15M)).... more

07/08/17

Soil Lab (trace metals)

How would I calculate the amount of each metal in my groups sample? And how do I make the values I calculate are expressed in terms of amount of metal per amount of soil? &My final answers are... more
Chemistry Lab

07/07/17

How you would construct a heat pack using salt, water, and inexpensive materials (such as might be provided to you in lab)?

 The salt that is being used is CaCl2  
Chemistry Lab Chemistry

05/24/17

How many grams of copper would you expect to form from 34.0g of Fe?

theretical yeild
Chemistry Lab

05/23/17

meaning of literature value with respect to the question in the description.

"comment on the accuracy of your boiling point determination for theunknown liquid based on your observation in comparison with the literature value" What does this mean???
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. 

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