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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Danb231 on February 25, 2010, 08:33:35 AM

Title: Gravimetric Analysis Question
Post by: Danb231 on February 25, 2010, 08:33:35 AM

Hi.

I've carried out a gravimetric analysis on Ni(II)Cl₂ using Magnesium powder and I was hoping to check my results, so is it possible to find out the theoretical mass of Nickel from the following information and reaction equation?

Ni(II)Cl₂ + Mg => MgCl₂ +Ni
Concentration of Ni(II)Cl₂ is 1moldm³.
Volume of Ni(II)Cl₂ is 15cm³.
Mass of magnesium used to displace Nickel is 0.6g.

Thanks.

Title: Re: Gravimetric Analysis Question
Post by: Danb231 on February 25, 2010, 09:00:26 AM

I think I've figured it out myself.

Mol = volume x concentration, therefore moles on LHS = 0.03, because the ratio is one to one. 

Which means that Ni = 0.015 x 56
                             = 0.84g

Can anyone tell me if this is correct?   

Title: Re: Gravimetric Analysis Question
Post by: Borek on February 25, 2010, 09:29:04 AM

Molar mass of Ni is not 56, so you are slightly off.

Just in case you should check if magnesium is not a limiting reagent.