Answer

Verified

447.9k+ views

**Hint:**First balance the equation. With balancing the number of moles can be calculated. Molarity can be calculated by dividing the number of moles with the volume of the solution. Normality is equal to molarity multiplied to the basicity of the compound.

**Complete answer:**

Molarity: The molarity of the solution is defined as the number of moles of the solute present per liter. It is represented by the symbol, M.

\[Molarity=\dfrac{\text{Moles of the solute}}{\text{Volume of the solution}}\]

Moles of the solute can be calculated by:

\[Moles=\dfrac{\text{mass of the solute}}{\text{molar mass of the solute}}\]

The normality of the solution is defined as the number of grams equivalent of the solute present in liters. It is represented by the symbol, N.

\[Normality=\dfrac{\text{Gram equivalent of the solute}}{\text{Volume of the solution}}\]

First, let us balance the given equation:

${{P}_{2}}{{O}_{5}}+{{H}_{2}}O\to {{H}_{3}}P{{O}_{4}}$

After balancing the equation will be:

$2{{P}_{2}}{{O}_{5}}+6{{H}_{2}}O\to 4{{H}_{3}}P{{O}_{4}}$

And the volume of the solution is 1 L. (Given)

So, from the balanced equation we can that there are 4 moles of phosphoric acid in 1 L of solution.

From this we can calculate the molarity of the solution:

\[Molarity=\dfrac{\text{Moles of the solute}}{\text{Volume of the solution}}\]

So, by putting the values in the above equation:

\[Molarity=\dfrac{\text{Moles of the solute}}{\text{Volume of the solution}}=\dfrac{4}{1}=4\]

The molarity is 4.

With molarity, we can find the normality of the solution.

Normality of the acid = molarity x basicity.

Phosphoric acid has basicity 3 because of the presence of hydrogen ions.

So, normality of the phosphoric acid will be:

$normality=\text{ 4 x 3 = 12 N}$

Hence, the normality is 12 N.

**So, the correct answer is “Option B”.**

**Note:**The balancing of the equation must be right. The molarity of the acid can be converted into normality by multiplying it with basicity. The molarity of the base can be converted into normality by multiplying it with acidity.

Recently Updated Pages

How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE

Mark and label the given geoinformation on the outline class 11 social science CBSE

When people say No pun intended what does that mea class 8 english CBSE

Name the states which share their boundary with Indias class 9 social science CBSE

Give an account of the Northern Plains of India class 9 social science CBSE

Change the following sentences into negative and interrogative class 10 english CBSE

Trending doubts

Difference Between Plant Cell and Animal Cell

In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE

Which are the Top 10 Largest Countries of the World?

Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

Fill the blanks with the suitable prepositions 1 The class 9 english CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

How do you graph the function fx 4x class 9 maths CBSE

The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths