Question

Is 2OH−+Ca2+−>2Ca(OH)2 balanced

Answer 1

No.

Step-by-step explanation:

No. There is 1 atom of Ca on the left and 2 Ca's on the right and 2 OH's on the left and 4 on the right.

The balanced equation is:

4OH- + 2Ca2+ ----> 2Ca(OH)2.

Answer 2

Is not balanced

Step-by-step explanation:

For an equation to be balanced there must be on each side of the equation the same amount of each atom.

2 OH− + Ca 2+ ----> 2 Ca(OH)2

On the left we have the following amounts of atoms:

Ca = 1

O = 2

H = 2

Total charges = 0

And on the right:

Ca = 2

O = 4

H = 4

Total charges = 0

We can see that on the right we have twice as many atoms as on the left, so we can delete a molecule of Ca(OH)2

2 OH− + Ca 2+ ----> Ca(OH)2

Now the equation is balanced because there are the same number of atoms on both sides and also the charges are equal in both sides.