Question

balance the equation Ca+H2CO3 GIVES US CaCO3+H20

Answer 1

$H2CO3 + Ca(OH)2 → CaCO3 + 2H2O$

Answer 2

Answer

I thinks so your question would be as follows:

Balance the equation $\rm Ca(OH)_2 + H_2CO_3$ → $\rm CaCo_3 + H_2O$

$\rm Ca(OH)_2$ = calcium hydroxide

$H_2CO_3$ = Carbonic Acid

$\rm CaCo_3$ = calcium carbonate

$H_2O$ = water

Firstly let us know what do we mean by balanced equation and how to balance an equation.

The number of atoms of each type of atom must be the same on each side of the equation once it has been balanced.

One thing we have to keep in mind that to balance an equation, we change the coefficients, not the subscripts in the formulas.

Now let us check here,

We need to have an eye on every element present in that chemical equation

Elements which are taking place in reaction are called reactants

Elements which are taking place in reaction are called reactants Elements which are produced in reaction are called products

Firstly at reactants

atom of calcium as reactant = 1

atom of calcium as reactant = 1 atom of hydrogen as reactant = 4

atom of calcium as reactant = 1 atom of hydrogen as reactant = 4 atom of carbon as reactant = 2

atom of calcium as reactant = 1 atom of hydrogen as reactant = 4 atom of carbon as reactant = 2 atom of oxygen as reactant = 5

Now at products

atom of calcium as reactant = 1

atom of calcium as reactant = 1 atom of hydrogen as reactant = 2

atom of carbon as reactant = 2

atom of carbon as reactant = 2 atom of oxygen as reactant = 4

Here we can observe that number of hydrogen and oxygen atoms are not equal on both the side.

So, we need an easiest way to do so.

As per this question we will will multiply water by '2' So as to equalize the unequal atoms.

Now we get,

$\rm Ca(OH)_2 + H_2CO_3$ → $\rm CaCo_3 + 2(H_2O)$

That's an balanced chemical equation.