Emperical Formula for hydrate

[Xenon100]

I have a lab in which I need to devise my own procedure for calculating the emperical formula of magnesium sulfate hydrate. I have done some research and found out that the simplest way to find it would be through evaporating the water off the hydrate, calculating the masses of the anyhydrous salt and water separately and then, dividing the mass values to find the simple formula ratio.

So My question is: Is it possible to use another method beside evaporating the water in order to find the Emperical Formula? Can I use a precipitate method to calculate the Emperical Formula?(As in I add some of the magnesium sulfate hydrate into water and then I mix it with another solution that will then form a precipitate.)

My idea is that I can calculate the mass of the precipitate I formed, filter it, dry it, and then use stochiometry to at least find the mass of the anhydrous magnesium sulfate. However, I'm curious as to how I would find then calculate the mass of the water molecules. If you have any suggestions at all, please reply

Thanks for your help

 

[Borek]

If you know initial mass of the sample, and amount of MgSO₄ in it, you can calculate mass of water, don't you?

You first idea was OK, although sometimes it won't work. You have to be sure if your salt didn't decompose on roasting.

 

[Blueshift5]

!

I would say that it is possible to use a precipitate method to calculate the empirical formula of magnesium sulfate hydrate. This method involves adding a known amount of the hydrate to water and then mixing it with another solution that will form a precipitate. The mass of the precipitate can then be measured, filtered, and dried to determine the mass of the anhydrous salt. However, it is important to note that this method may not give as accurate results as the evaporation method, as there may be some loss of the anhydrous salt during the filtration and drying process.

To calculate the mass of the water molecules, you can use the known mass of the anhydrous salt and the mass of the precipitate to determine the mass of water lost during the process. This can then be used to calculate the mass of water molecules in the hydrate and ultimately determine the empirical formula.

It is always important to consider multiple methods and choose the one that is most suitable for your specific experiment. I suggest conducting some trials with both methods to compare the results and determine which one gives the most accurate and precise data. Additionally, it is always a good idea to consult with a mentor or conduct further research to ensure the accuracy and validity of your experimental procedure.