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Chemistry lab formulas?

by ldixon
Tags: chemistry, formulas
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Sep27-06, 05:24 PM
P: 17
We lit a piece of Mg so the formula is:
2Mg(s) + O2(g) HEAT-- 2MgO(s)

We then dissolved this in water so it would then be:
MgO(s) + H2O(l) -- Mg(OH)2(l)

Next we blew into water which is:
CO2(g) + H2O(l) -- H2CO3(l)

Is this all correct? Should I have (Aq) after the H2CO3?
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Sep27-06, 05:44 PM
Sci Advisor
P: 882
2Mg(s) + O2(g) HEAT-- 2MgO(s)
I agree. This reaction is quite exothermic itself after the Mg is ignited, a lot of heat it given off on the products side.
MgO(s) + H2O(l) -- Mg(OH)2(l)
If the Mg(OH)2 is dissolved in the water it should be in the aqueous (aq) state, not liquid.However, I dont think MgO is very soluble in water. MgO
CO2(g) + H2O(l) -- H2CO3(l)
Just like the previous reaction, if the H2CO3 is in solution it should be in the aqueous (aq) state, not liquid.

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