Answer

Verified

381k+ views

**Hint:**We have to remember that the calculation of equivalent mass should be different for acids and bases. For bases, equivalent mass can be calculated by dividing the molar mass with the hydroxyl group present in a particular base and for acids the molar mass is divided by the number of protons present in an acid.

**Complete answer:**

We will calculate the number of equivalents for one mole of sodium thiosulphate. The oxidation state for the elements leaving sodium and iodine is the same at both left hand side and right hand side. We need to calculate the oxidation states for other elements first to get equivalent mass.

Consider the oxidation state of sulphur in left hand side and right hand side be x and y

$\left( {2 \times 1} \right) + \left( {2x} \right) + \left( {3x - 2} \right) = 0$

$2x = + 4$

$ \Rightarrow x = 2$

Thus, oxidation state of sulphur in left hand side is $2$

For calculating y,

\[\left( {2 \times 1} \right) + \left( {4 \times y} \right) + 6x - 2 = 0\]

$4y = 10$

$y = \dfrac{5}{2}$

The change in oxidation state in sulphur is ½. Since sulphur is two in number in sodium thiosulphate thus \[2 \times \dfrac{1}{2} = 1\] therefore the number equivalent in one mole of sodium thiosulphate is $1$.

Equivalent weight of sodium thiosulphate= molecular weight of sodium thiosulpahte

Since molecular weight of sodium thiosulphate=\[2 \times \dfrac{1}{2} = 1\]

Molecular weight of sodium thiosulphate is:

\[2 \times 23 + 2 \times 32 + 3 \times 16 + 5 \times 18 = 248\]

Thus the equivalent mass of sodium thiosulphate is $248$.

**Note:**

We must have to remember that the electrons transferred should be taken by the total number of atoms, since there are two sulphur atoms therefore one mole of sodium thiosulphate contains two sulphur atoms. As we know that for acids and bases the calculation for equivalent mass will be different.

Recently Updated Pages

what is the correct chronological order of the following class 10 social science CBSE

Which of the following was not the actual cause for class 10 social science CBSE

Which of the following statements is not correct A class 10 social science CBSE

Which of the following leaders was not present in the class 10 social science CBSE

Garampani Sanctuary is located at A Diphu Assam B Gangtok class 10 social science CBSE

Which one of the following places is not covered by class 10 social science CBSE

Trending doubts

A rainbow has circular shape because A The earth is class 11 physics CBSE

Which are the Top 10 Largest Countries of the World?

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

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

Give 10 examples for herbs , shrubs , climbers , creepers

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

Why is there a time difference of about 5 hours between class 10 social science CBSE

Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE

Difference Between Plant Cell and Animal Cell