Thursday
September 3, 2015

Homework Help: Chemistry

Posted by candy on Saturday, January 31, 2009 at 9:46am.

1) When calcium is reacted with cold water, the equation is as follows: -
Ca(s) + H2O(l) -->Ca(OH)2(aq) + H2(g)
Isn't Ca(OH)2 insoluble? Why is the state symbol aqueous? When I conducted the experiment in a test tube with cold water, I got a white suspension (precipitate).

2) When I placed a piece of magnesium foil in a test tube of cold water,a very slow stream of hydrogen gas bubbles was observed. When writing the equation for the reaction, should I write
i) Mg(s) + 2H2O(l)-->Mg(OH)2(s) + H2(g)

or

ii)Mg(s) + H2O(g)-->MgO(s) + H2(g)

since we know that magnesium reacts with steam to form magnesium oxide as in ii)?

Thanks!

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