# Please help write out and balance the following equation: Calcium Hydroxide + carbon dioxide --> calcium carbonate + water

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You are only allowed to ask one question at a time so I edited down your question accordingly. You are asking for the following equation to be written out and balanced: calcium hydroxide plus carbon dioxide yields calcium carbonate plus water. The chemical equation is written in symbol form below:

Ca(OH)2 + CO2 --> CaCO3 + H2O

Calcium is Ca and it forms the +2 cation. So it will be balanced by 2 hydroxide anions to make calcium hydroxide since they have a -1 charge. Carbon dioxide is CO2 since that is what its name applies. For calcium carbonate, again the calcium cation is +2 and the carbonate anion is -2 so they join in a 1:1 molar ratio to make CaCO3. And water is well known as H2O. So that is how we come up with the above equation. We can also see that the above equation is balanced since it has the same number of each element on both sides of the equation: 1 C, 1 Ca, 4 O, and 2 H. So the complete balanced chemical equation is:

Ca(OH)2 + CO2 --> CaCO3 + H2O

This is the balanced equation:

Ca(OH)2 +CO2 -> CaCO3 + H2O

K2CO3 + 2HCl -> 2KCl + H2O + CO2

Hope this helps