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
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?
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
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
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

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

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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