321 Answered Questions for the topic Chemistry Lab

Chemistry Lab

10/10/15

You used .5000 g of solid and it required 9.00 mL of 1.00 M HCL to titrate to the endpoint. Determine the number of moles of HCl required in your titration.
This is a post lab question from my chem lab.
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Chemistry Lab

09/23/15

Calculate the number of moles of H2O removed and the moles of anhydrous CuCl2 remaining in the crucible?
Having trouble with a chem problem, thank you for the help!
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Chemistry Lab

09/22/15

Please help!
Which of the following properties is/are classified as physical?i. The odor of glass cleaning solutionii. The color of chlorine gasiii. The electrical conductivity of copper wireiv. The ability of... more
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Chemistry Lab Chemistry

09/21/15

Find the number of waters of hydration in Epsom salts
Epsom salt os a hydrated ionic compound with the following formula: MgSO4•xH2O. A 4.93 g sample of Epsom salts was heated to drive off the water of hydration. The mass of the sample after complete... more
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09/20/15

Crystallization Question needed ASAP please!
You dissolve an amount of solid Q in 195.0 mL solvent, forming an unsaturated solution. The solubility of Q at 0°C is 0.87 g/100 mL. The amount of solid remaining in solution at 0°C is 13.0% of the... more
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Chemistry Lab

08/31/15

Calculate the volume of a 0.175 M HBr solution required to neutralize 40.95 mL of 0.300 M Ba(OH)2 solution
Calculate the volume of a 0.175 M HBr solution required to neutralize 40.95 mL of 0.300 M Ba(OH)2 solution
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08/25/15

Chemistry Question 3 Need Help ASAP
A laboratory experiment requires 2.0 L of a 1.5 M solution of hydrochloric acid (HCl), but the only available HCl is a 12.0 M stock solution. How could you prepare the solution needed for the lab... more
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Chemistry Lab

07/18/15

Redox Titration Lab Question
The reactions given are: I2 + 2Na2S2O3 --> 2NaI + Na2S4O6 ( I2 + 2e^- --> 2I- ) ( 2S2O3^-2 --> S4O6^-2 + 2e^- ) Assume that a 2.130 g sample of bleach was weighed out. When a sodium... more
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Chemistry Lab

06/19/15

Chem Lab Oxidation of Manganese
a student conducts an experiment in which mn2+ reacts with another substance and is converted to mno42-. is mn2+ the oxidizing agent or the reducing agent, and how manyelectrons does it gain or... more
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06/08/15

If 5 g of sodium bicarbonate is combined with water to make a 100 ml solution, how do I find out how many grams in the final solution?
In chem lab we did a quality control test to determine if the label for sodium bicarbonate (baking soda) is accurate. The label says there is 1,258.56 mg of sodium in a 5 g serving. We made a... more
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Chemistry Lab Chemistry Titration

06/07/15

How would I perform a titration for quality control analysis on sodium levels in a soda and vit. C levels in coconut water?
In chemistry lab we are supposed to perform quality control analysis on a basic product and an acidic product. I chose Sprite and coconut water, but I'm trying to figure out how to do the... more
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Chemistry Lab

06/06/15

What mass (in grams) of potassium acetate, KC2H3O2, must be added to 124 mL of 0.010 M acetic acid to form a buffer solution with a pH of 4.5?
 I cannot figure out what formula or how to start out the problem. Please help.
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Chemistry Lab Chemistry

05/31/15

if i have a 2.0 concentration of an acetic acid in a 100 ml flask at a 3.04 ph what is the Ka expression
I need to find the Ka expression, the volumeof a 2 M acetic acid, the (H+)eq, the (C2H3O2_)eq, and the (HC2H3O2)eq.
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Chemistry Lab

05/28/15

explain why the Magnesium Group cations are more likely to interfere with the Lithium Group tests than vice versa
inorganic chemistry qualitative analysis
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Chemistry Lab

05/17/15

enthalpy of fusion of ice is 334 J/g. Calculate your error.
The accepted value for the enthalpy of fusion of ice is 334 J/g. Calculate your error.
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05/07/15

what was the final temperature?
A 10.35g piece of copper metal was heated to 85.5 degrees C and then placed into 23.6g of water. the initial temperate of the water was 18.3 degrees C. what was the final temperature?   solid... more
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Chemistry Lab Chemistry Moles Volume

04/25/15

Finding concentration!
Please help if you're able. I really don't understand this at all.    A student has a flask containing nitric acid (HNO3 (aq)). She is not sure what the concentration of this acidic solution is... more
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Chemistry Lab

04/02/15

What is the ppm Fe in the diluted standard solution?
A diluted iron standard is prepared by pipeting 2.00 mL of stock 40.0 ppm Fe solution into a 50.0 mL volumetric flask, adding the reagents, and diluting to the mark with water.
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Chemistry Lab

04/01/15

Chemistry Lab Help Please!
Use a thermometer to measure the temperature of boiling water. Now add salt to the boiling water. Wait until the water boils again then record your new temperature. What happened to the boiling... more
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Chemistry Lab

04/01/15

Chemistry Lab Help Please!
Place a cup of salt and a cup of rice side by side on some aluminum foil laid out on a baking sheet. Heat the salt and rice for 10 minutes in an oven preheated at 250 degrees celcius. Which has a... more
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Chemistry Lab Chemistry Elements

03/26/15

Using Clues to Identify Elements
Elements 2, 5, 18, 29, and 33 are colorless, odorless, unreactive gases. Of these gases, element 29 has the largest atomic mass.Elements 13, 19, 23, and 34 have six valence electrons, and element... more
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Chemistry Lab Chemistry

03/25/15

chemistry dilution question
how do i calculate the concentration of silver in PPM in a 0.5M solution of AgNO3 in 5% HNO3 solution. The answer should be in PPM
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Chemistry Lab

03/11/15

what happens to ionization energy within a family (group 1 to 17) as the atomoc number increases?
How does this effect the properties of the elements within the family?       From Graphing Perdiodic Relationships Lab.  Chemistry Form: L3.3a
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Chemistry Lab Chemistry Conversion

03/03/15

why are only four lines visible for hydrogen when calculations show many possible emission lines?
why are only four lines visible for hydrogen when calculations show many possible emission lines?
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Chemistry Lab

03/02/15

Please help me solve this and show me how you got the answer. Thank you!
A student prepared aspirin using 2.019 g of salicylic acid and 5.2 ml of acetic anhydride (d=1.08g/ml) 1. Which reactant is limiting? salicylic acid or acetic anhydride 2. What is the theoretical... more
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