[Student99]

We have to choose 2 compounds in the list below to form a solid product.
This solid need to react with hydrochloric acid to form exactly 300mL of a gas,
that will be collected in a specific system to simulate an "airbag".

List: MgCl2, NaOH, Potassium Iodide(KI), NaSO4, Na2CO3, CuSO4, FeCl3, CaO and CaSO4.


So, I was thinking about Na2CO3 and CaSO4, that will form CaCO3 and Na2SO4. CaCO3 react with HCl
to form CO2 according to the equation: 2HCl + CaCO3 --> CaCl2 + H2O + CO2

Is it all ok??

Now, how many CaCO3 is required to obtain 300 mL of CO2?
I need to know temperature and pression, right?

I would really appreciate any help you guys can give me!

[Hunter2]

Why to make CaCO₃? Na₂CO₃ also react with HCl. Yo can skip the first step.

For the gas volume you need the ideal gas equation or the molar gas volume. The reat yo can calculate by the mole of the reactants.

[billnotgatez]

@Hunter2
I am thinking the question was assigned that required 2 substances initially.
And, if a student uses only one substance they fail because they do not follow directions.
I am assuming the teacher is mean.
I could be wrong but that is what I read into the question as posted.

@Student99
Has your teacher ever referred to as a standard ambient temperature and pressure or the like?
Or maybe referred to STP =  standard temperature and pressure?
http://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure

@Student99
Why did you not write out the first equation?
Why do you not take advantage of the forum editor to properly present a formula?
2HCl + CaCO₃  CaCl₂ + H₂O + CO₂