Identify the missing coefficient in the balanced equation and classify the type of reaction.
2h3po4 +3ba(oh)2 — baz(po4)2 +
h2o
6; neutralization
3; combustion
6; combustion
3; neutralization

6; Neutralization

Explanation:

(Unbalanced)

Balancing is making the number of atoms of each element same on both the sides  (reactant and product side).

To find the number of atoms of each element we multiply coefficient and the subscript  

For example contains  

5 × 1 = 5 ,Ca atoms and

5 × 2 = 10, Cl atoms  

If there is a bracket in the chemical formula  

For example we multiply coefficient × subscript × number outside the bracket to find the number of atoms  

(Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )

So

3 × 3 = 9 , Ca atoms  

3 × 1 × 2 = 6, P atoms  

3 × 4 × 2 = 24, O atoms are present

Reactant side           Number of atoms or groups                   Product side

                                       of each element    

3                                                 Ba                                                           3

2                                                                                      2

12                                                H                                                             2

6                                                 O (Exclude O of )         1

To balance H and O, multiply by 6 so we have

Reactant side           Number of atoms or groups                    Product side

                                       of each element  

3                                                 Ba                                                           3

2                                                                                      2

12                                                H                                                            12

6                                                 O (Exclude O of )        6

Balanced

Acid and base reacts to form salt and water is called a neutralization reaction.