[nugiboy]

Hi

I need to write a plan for an experiment to prove 1 mole of hydrogen is produced 1 mole of strontium with excess hydrochloric acid.

The Equation is:

Sr(s) + 2HCL(aq) ---> SrCl₂(aq) + H₂(g)

I need a pretty accurate method of what im going to do. I sort of have an idea of reacting the strontium and hydrochloric acid in a test tube, and then use a delivery tube to feed the gas into a syring, which will move as the gas fills it. Is this the right sort of method, or is there a more accurate / efficient method. Im wandering whether the pressure of the hydrogen produced would be enough to move the syringe back.

Any feedback would help.
Thanks

[Arkcon]

Coupla quick questions before you start:  One mole of Sr metal, is how many grams, and what's its cost?  One mole of hydrogen gas, at STP, is what volume?  And that's just for starters.

[nugiboy]

At standard conditions, one mole of hydrogen is 24 dm³. A mole of strontium is about 90g. However, i can only use between 1 and 25g of it, and will just have to scale it down. The cost of strontium i don't really know, but that doesn't really matter. Its just a plan, i don't need to actually do the experiment. I just need a general sort of method really.

[Arkcon]

They had a cardboard box in my high school chem class, that was the volume of one mole of gas at STP, it was a pretty big box to fit in a syringe, as you can figure for yourself.  So yes, you'll want to scale down.  Question, the output of the reaction will be moist hydrogen released from aqueous solution, how would you compensate for that? (I ask the question this way because a similar question has come up lately -- partial pressure of water vapor)  There will also likely be come HCl vapor contamination, so you'll have to plan for that.