Question

Write fully balanced equations for the following:
${P_2}{O_5} + {H_2}O \to $

Answer 1

Hint: We have to know that a balanced chemical equation is an equation that contains the same amount of atoms for every element that take part in reaction which are indicated in the reactant sides as well as product sides. We have to know that for a requirement of equation, the law of conservation of matter should be satisfied and should be consistent.

Complete answer:
We are given chemical equation as,
${P_2}{O_5} + {H_2}O \to $
In the above chemical equation, we can say that the name of ${P_2}{O_5}$ is diphosphorus pentoxide and the name of ${H_2}O$ is water. We have to know that when diphosphorus pentoxide reacts with water, the product formed is phosphoric acid. We can give the chemical representation as ${H_3}P{O_4}$. We can give the word equation as,
$Diphosphoruspentoxide + Water \to Phosphoricacid$
We can write the unbalanced equation as,
${P_2}{O_5} + {H_2}O \to {H_3}P{O_4}$
We have to follow the following steps while balancing equation:
We have identify products and reactants
We have to write the formulas of products and reactants
We have to identify the number of molecules (or) formula units of reactants and products in the reaction
We have to know the amount of atoms of each element taking part in the reaction
We have to know the amount of moles of every substance
We can see that in the above unbalanced equation all the atoms are unbalanced.
We have to place 3 before ${H_2}O$ and 2 before ${H_3}P{O_4}$ to balance the hydrogen atoms.
The equation would be written as,
${P_2}{O_5} + 3{H_2}O \to 2{H_3}P{O_4}$
Now each side has six atoms of hydrogen, two atoms of phosphorus, eight atoms of oxygen. So, we can write the balanced equation as,
${P_2}{O_5} + 3{H_2}O \to 2{H_3}P{O_4}$

Note:
We have to know that the given chemical reaction is a synthesis reaction/combination reaction. The reason why we say the given reaction is a synthesis reaction is because two reactants are combined to form a single product. We have to know that a balanced chemical equation follows the law of conservation of mass, which states that mass of reactants and mass of products are equal.