7 Answered Questions for the topic Chem Lab

04/30/20

Finding the Ksp value of Ca(OH)2
A student determined the solubility of Ca(OH)2 in 0.200 M CaCl2 as 0.0026 mol/L. Calculate the Ksp value for Ca(OH)2 using these data. I found this to be =7.03E-8, but it says that I have entered... more
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Chem Lab Chemistry

06/23/19

General Chemistry

a student carried out the reaction below starting with 1.993 of unknown, and found that the mass loss due to CO2 was 0.593. how many moles of X2CO3 were consumed?
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Chem Lab Science Chem Mixture

12/01/17

Categorize these solids as pure substance or mixtures.Categorize the pure substances as elements vs compounds and metals vs non-metals.
Sulfur Wooden splint Copper Powder Charcoal Selenium powder Steel Wool
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Chem Lab

10/04/17

I crushed an aspirin tablet and got 341.5 mg which is more than a typical tablet weights (325 mg) why did this happen?
We crushed 2 aspirin pills in lab and got the weight to be 683 mg. Divide that by 2 and each pill weighs about 341.5 mg. The pill weight on the bottle read 225 mg. Our percent error is, therefore,... more
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Chem Lab

08/28/17

A 0.315 g sample of Tums (containing CO2−3CO32- ) is dissolved in 25.0 mL of 0.102 M HCl
How many mol of base are in the antacid? The hydrochloric acid that is not neutralized by the Tums is back titrated with 8.75 mL of 0.102 M NaOH
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01/20/16

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...
Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water.    I am so so so... more
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10/02/14

How does contamination of water in a volumetric pipet affect density when calculating the density of an unknown substance?
Before getting to my question, I will state some background information that isn’t necessarily relevant to my question.In our chemistry lab, we initially calibrated how much water we delivered on... more
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