288 Answered Questions for the topic Chemistry Lab

09/16/17

Possible Freezing Point Measurement Error

The freezing point of pure water was measured to be 0.18 to 0.20 degrees Celsius, The accepted freezing point of water is 0 degrees Celsius. What possible reasons could be the why I got this error... more

09/14/17

determine the volume of 1.0 teaspoon. 1 tablespoon=3teaspoons; 1tablespoon=1/2 fluid ounce

question #3 on pg49 of chemistry lab book 

09/11/17

Calculate required volume...

Calculate the required volume of Stock 2 (20 mg/mL of ethanol) that you will need to add to each of five volumetric flasks so that when diluted to 100 mL each will yield the desired ethanol... more

09/10/17

Chemistry question

If a standard drink is defined as 10 g of alcohol, what volume of 38 % vodka corresponds to 1 standard drink? How many standard drinks are them in 150 mL of 8.8 % Sauvignon Blanc?

09/10/17

Chemistry question calculation

If you are provided a stock solution of 15 mg/L of ethanol how much of this solution would you need to transfer to a 50 mL volumetric flask to produce a solution of concentration 1 mg/L?

09/08/17

GC-MS analysis

What do you need to screen anabolic androgenic steroids in a single GC-MS analysis?

09/05/17

When using a Bunsen burner and ring clamp, always use the "Three Finger Rule". Explain why this rule exists.

When using a Bunsen burner and ring clamp, always use the "Three Finger Rule". Explain why this rule exists.

09/05/17

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

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

08/09/17

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

08/09/17

Write a balanced equation

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

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

05/24/17

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

theretical yeild

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???

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

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

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!

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

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?
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