Answer
Verified
395.7k+ views
Hint: By knowing the equivalent mass of the substances, we can calculate the normality of the solution. When a substance is given in percentage, we can take the percent in mass in 100mL solution. The equation of normality is given as:
$\text{Normality}=\frac{\text{Equivalents}\times 100}{\text{Volume of Solution}}$
Complete step by step answer:
Normality is equal to the gram equivalent weight per litre of solution. It is a measure of concentration. Gram equivalent weight is the measure of reactive capacity of a molecule. Normality can also be defined as number of mole equivalents or number of gram of solute present in 1 litre of a solution. Equivalent is the number of moles of reactive units in a compound.
We can consider 2.1% of sulphuric acid as 2.1g of sulphuric acid in 100mL solution as it is given in the question that the percentage is weight by volume.
So, using this information we can find the gram equivalent mass. Gram equivalent mass of a substance is molar mass divided by the valency of the substance. For sulphuric acid it will be,
Gram equivalent mass=$\frac{\text{Molar Mass}}{\text{Valency}}=\frac{98}{2}=49$
Now number of gram equivalent mass is the given weight of sulphuric acid = 2.1 divided by the gram equivalent mass = 49 and it is written as:
Number of gram equivalent mass = $\frac{2.1}{49}$
Let us consider the equation for normality,
$\text{Normality}=\frac{\text{Equivalents}\times 100}{\text{Volume of Solution}}$
Here, equivalents = $\frac{2.1}{49}$ and the total volume of the solution we know is 100mL.
Substituting these values we get,
Normality = $\frac{\frac{2.1}{49}\times 1000}{100}$ = 0.428N.
Thus, the normality of 2.1% of sulphuric acid is 0.428N.
So, the correct answer is “Option C”.
Note:
There might be confusion between normality and molarity. Normality depends on gram equivalent per litre of solution and molarity depends on the number of moles of solute per litre of solution.
$\text{Normality}=\frac{\text{Equivalents}\times 100}{\text{Volume of Solution}}$
Complete step by step answer:
Normality is equal to the gram equivalent weight per litre of solution. It is a measure of concentration. Gram equivalent weight is the measure of reactive capacity of a molecule. Normality can also be defined as number of mole equivalents or number of gram of solute present in 1 litre of a solution. Equivalent is the number of moles of reactive units in a compound.
We can consider 2.1% of sulphuric acid as 2.1g of sulphuric acid in 100mL solution as it is given in the question that the percentage is weight by volume.
So, using this information we can find the gram equivalent mass. Gram equivalent mass of a substance is molar mass divided by the valency of the substance. For sulphuric acid it will be,
Gram equivalent mass=$\frac{\text{Molar Mass}}{\text{Valency}}=\frac{98}{2}=49$
Now number of gram equivalent mass is the given weight of sulphuric acid = 2.1 divided by the gram equivalent mass = 49 and it is written as:
Number of gram equivalent mass = $\frac{2.1}{49}$
Let us consider the equation for normality,
$\text{Normality}=\frac{\text{Equivalents}\times 100}{\text{Volume of Solution}}$
Here, equivalents = $\frac{2.1}{49}$ and the total volume of the solution we know is 100mL.
Substituting these values we get,
Normality = $\frac{\frac{2.1}{49}\times 1000}{100}$ = 0.428N.
Thus, the normality of 2.1% of sulphuric acid is 0.428N.
So, the correct answer is “Option C”.
Note:
There might be confusion between normality and molarity. Normality depends on gram equivalent per litre of solution and molarity depends on the number of moles of solute per litre of solution.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Assertion CNG is a better fuel than petrol Reason It class 11 chemistry CBSE
How does pressure exerted by solid and a fluid differ class 8 physics CBSE
Number of valence electrons in Chlorine ion are a 16 class 11 chemistry CBSE
What are agricultural practices? Define
What does CNG stand for and why is it considered to class 10 chemistry CBSE
The rate of evaporation depends on a Surface area b class 9 chemistry CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
State whether the following statement is true or false class 11 physics CBSE
A night bird owl can see very well in the night but class 12 physics CBSE