Chapter 14, Problem 120A

(a)

Interpretation Introduction

Interpretation: To write the balanced chemical reaction between the tetra-phosphorous Decoxide and water forming phosphorous acid.

Concept Introduction: The representation of the chemical formulas of a substance that react and the substance that are produced is called as chemical equation. In this the number of atoms of the reactants and the atoms of products should be balanced that is the number of atoms should be same on both the sides of a chemical equation.

Answer to Problem 120A

  ${\text{P}}_{\text{4}}{\text{O}}_{\text{10}}{\text{+6H}}_{\text{2}}\text{O}\to 4{\text{H}}_3{\text{PO}}_{\text{4}}$

Explanation of Solution

The molecular formula for Tetra Phosphorous Decoxide is ${\text{P}}_{\text{4}}{\text{O}}_{\text{10}}$ and when it is made to react with water is results in the formation of Phosphoric acid. When the reaction has to be balanced then the water molecules should be 6 moles on the reactant side and the Phosphoric acid should be 4 moles on the product side in order to make all the atoms balanced in the given chemical equation.

(b)

Interpretation Introduction

Interpretation: To write the balanced chemical reaction between the tetra-phosphorous Decoxide and water forming phosphorous acid.

Concept Introduction: The representation of the chemical formulas of a substance that react and the substance that are produced is called as chemical equation. In this the number of atoms of the reactants and the atoms of products should be balanced that is the number of atoms should be same on both the sides of a chemical equation.

Answer to Problem 120A

  ${\text{Al}}_{\text{2}}{\text{S}}_{\text{3}}{\text{+6H}}_{\text{2}}\text{O}\to {\text{2Al(OH)}}_3+{\text{3H}}_{\text{2}}\text{S}$

Explanation of Solution

Aluminum Sulfide on reacting with water will result in the formation of Aluminum hydroxide and hydrogen sulfide. On the reactant side 1 moles of aluminum sulfide and 6 moles of water is made to react that result in the formation of 2 moles of Aluminum hydroxide and 3 moles of Hydrogen sulfide. These moles on either side of the reaction will make it a balanced reaction.