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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: nebulaa on December 06, 2023, 02:17:09 PM

Title: Lab question
Post by: nebulaa on December 06, 2023, 02:17:09 PM

Hello all,

I am working on a lab which explores the mass of hydrated vs anhydrous copper (II) sulphate. I have essentially completed the lab, and I've gone over my work three times. At the end, we are asked to complete the formula and the name of the compound which is formed at the end. It is written as:

Round your answer to a whole number to complete the formula of hydrated copper (II) sulphate:
CuSO₄._H₂O

So, I am meant to fill in the blank with the number I ended up with after my calculations, which was 9. So my result is:

CuSO₄.9H₂O

Then we are asked to name the compound, which I believe would be named: copper (II) sulphate nonahydrate.

I feel weird about my results, because from google searching, the most common outcome of this is copper (II) sulphate pentahydrate, but, that is not what I got.

I suppose I am asking if the result I got is even a viable compound? Or if it seems likely that I went off somewhere during my calculations?
Any insight would be greatly appreciated.

Thank you!

Title: Re: Lab question
Post by: billnotgatez on December 06, 2023, 02:59:56 PM

If you search Wikipedia.org on Copper sulfate
you will find a link

https://en.wikipedia.org/wiki/Copper(II)_sulfate (https://en.wikipedia.org/wiki/Copper(II)_sulfate)

The first sentence in that page

Quote

Copper(II) sulfate, also known as copper sulphate, is an inorganic compound with the chemical formula CuSO4. It forms hydrates CuSO4·nH2O, where n can range from 1 to 7. The pentahydrate (n = 5), a bright blue crystal, is the most commonly encountered hydrate of copper(II) sulfate.

Title: Re: Lab question
Post by: nebulaa on December 07, 2023, 04:26:46 PM

Thank you so much!