Homework Help: chem

Posted by Akira12 on Wednesday, November 28, 2012 at 5:35pm.

For the following equilibrium system, which of the changes will form more CaCO3 (more moles CaCO3)?
CO2 + Ca(OH)2=CaCO3 +H2O delta H =-113kJ
Write and explain if amount CaCO3 decrease, no change or increase with regards to the following situations:
a) Decrease temperature at constant pressure (no phase change).
b) Increase volume at constant temperature.
c)Increase partial pressure of CO2.
d)Remove one-half of the initial CaCO3.

chem - DrBob222, Wednesday, November 28, 2012 at 6:21pm
Le Chatelier's Principle says, in simple terms, that a system in equilibrium will try to undo what we do to it.
a) The reaction is exothermic meaning it releases heat; therefore, if we decrease temperature (decrease the heat to it) the reaction will respond by trying to increase it. If it goes forward (to the right) that increases it. If it goes to the left it uses up heat. If it does neither, nothing happens. (Those are the only three choices you have.) So it must be obvious that decreasing T means it will shift to the right.

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