[CHM 111] Lab Report Questions

[Andrew J. Pounds]

On 6/18/21 1:01 PM,  wrote:
> Good Afternoon Dr. Pounds,
>
> My name is  and I have several questions about the lab report.
>
> 1.) After we receive the concentration of the unknown from the graph, 
> how do we calculate the grams of NiSO4? I know we use the 
> concentration of the unknown (M) and multiply it by the 50.00 mL of 
> solution, but what do we use after? Would we use the molar weight of 
> NiSO4?
Yes.  If you know the molarity of the nickel sulfate solution and you 
multiply that by the volume (in liters) then you will have the moles of 
nickel sulfate in your unknown.  Use the molar mass of the nickel 
sulfate (don't forget that its a hydrate) to find the mass.
> 2) Once we get the grams of NiSO4, how would we compute the gramps of 
> the Nickel ion?

The relationship between nickel sulfate hexahydrate and nickel is 1:1 -- 
so multiply the moles of nickel sulfate hexahydrate in your solution by 
the molar mass of just nickel.

> 3) For the Atomic Spectra Lab, when we make the graph in order to find 
> the wavelengths, do we need to make 4 separate graphs for each, or 
> only one graph and use that one graph in order to find the wavelengths 
> for the Helium lamp, Hydrogen lamp, the salt, and the candle?
>

You are only making ONE GRAPH because the only actual wavelengths you 
have are for the mercury lamp.  Then you can use your calibration plot 
to find the actual wavelengths for the other lamps and the salt.  Since 
the candle was continuous, you do not need to determine those wavelengths.


Let me know if you have other questions.



-- 
*/Andrew J. Pounds, Ph.D./*
/Professor of Chemistry and Computer Science/
/Director of the Computational Science Program/
/Mercer University/
/1501 Mercer University Drive, Macon, GA 31207 /
/(478) 301-5627/
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