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Chemistry question? Simple stoicheometry?
2HCl + caco3 -> h2co3 + cacl2
h2co3 -> h2o + co2
I used 50mL of HCl, and 0.1g of CaCO3
the co2 produced from the previous reaction, which is 24mL and 0.001 moles (found out with stoicheometry), is dissolved in 25mL of h2o. Here is the equation:
co2 + h2o <-> h2co3 <-> (h+) + hco3
my question is: how do you find the pH (concentration of (H+)) using stoicheometry?
if it's impossible, PLEASE tell me!
help would be awesome! thanks!
1 Answer
- ColinLv 78 years agoFavorite Answer
How did you ensure all 24mL CO2 dissolved in the 25mL of H2O? This is pretty difficult as it would normal just bubble through it.
Also the reaction with water is an equilibrium, as you show, so not all the CO2 will dissolve anyway. You need to know the acid constant Ka to proceed further. The outline of how to do this is shown at
http://en.wikipedia.org/wiki/Carbonic_acid#pH_and_...
There is also a useful table.
It would be far simpler just to use a pH meter!
Source(s): rtc
