Question

Balance the neutralization reaction of phosphoric acid with magnesium hydroxide. States of matter are not needed. x x. He ► o , H2PO4 + Mg(OH)2 →

Answer 1

H_{​​​​​​3}​​​​​PO_​​​4.  +. Mg(OH)_2. $\rightarrow$. Mg_{​​​​​3}​​​​(PO_​​4)_2.   +. H_{​​​​​​2}​​​​​O

Mg. 1 * 3. = 3 3

P. 1. 2

O. 4+2. 8+1

H. 3+2. 2

Balance Mg atoms by multiplying by 3 on left hand side

H_{​​​​​​3}​​​​​PO₄ +. 3Mg(OH)_2. $\rightarrow$. Mg_{​​​​​3}​(PO_{​​​​​4})_2.   + H_{​​​​​​2}​​​​​O

Mg. 3. 3

P. 1* 2 = 2. 2

O. 4 + 6. 8 + 1

H. 3 + 6. 2

Balance P atoms by multiplying by 2 on left hand side

2H_{​​​​​​3}​​​​PO_4.    +. 3 Mg(OH)_2.   $\rightarrow$. Mg_{​​​​​3}​​​​(PO_{​​​​​4})_2.   +. H_{​​​​​​2}​​​​​O

Mg. 3. 3

P. 2. 2

O. 8 + 6. 8 + (1 * 6) = 14

H. 6 + 6. 2

Balance oxygen by multiplying oxygen atoms of water by 6

2H₃PO_4. +. 3Mg(OH)_2. $\rightarrow$Mg_​3(PO_{​​​​​​​​4})_2. +. 6H₂O

Mg. 3. 3

P. 2. 2

O. 8+6 = 14. 8+6 = 14

H. 6. + 6 = 12. 12

As it can be seen all the atoms are balanced now. Hence this equation is balanced.

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