Question

how to balance (HNO3) + Ca(OH)2 → Ca(NO3)2 + 2(H2O)

Answer 1

2(HNO3) + Ca(OH)2 -> Ca(NO3)2 + 2(H2O)

this equation in the question was almost balanced...

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Answer 2

$\rm HNO_3 + Ca ( OH)_2 \longrightarrow Ca (NO_3)_2 + 2( H_2O)$

Step 1 : Balance all the atoms except that of hydrogen and oxygen .

Comparing $\rm NO_3$ : On left = 1 , On right = 2

Comparing Ca : On left = 1 , on right = 1 .

Hence , Ca is already balanced , we will balance $\rm NO_3$ by multiplying on left by 2.

$\rm 2 HNO_3 + Ca(OH)_2 \longrightarrow Ca(NO_3)_2 + 2(H_2O)$

Now , we will see if our Ca is affected by our balancing of $\rm NO_3$ .

There is no change on Ca .

Step 2 : Now , we will balance Hydrogen (H) and Oxygen (O) .

For H : on left = 4 , on right = 4

For O : on left = 2 , on right = 2 ( Not included of $\rm NO_3$

Hence , the atoms of H and O are already balanced. Hence the balanced chemical equation is :

$\rm 2 HNO_3 + Ca(OH)_2 \longrightarrow Ca(NO_3)_2 + 2(H_2O)$