If a is the degree of dissociation of Na2SO4, the van’t Hoff factor (i) used for calculating the molecular mass is :

Question

If a is the degree of dissociation of Na2SO4, the van’t Hoff factor (i) used for calculating the molecular mass is : (A) 1-2α (B) 1+2α (C) 1-α (D) 1+α

Tardigrade Admin · Accepted Answer

Na2SO4 leftharpoons 2Na+ + SO2-4 van’t Hoff factor i = [1 + (y - 1)α] where y is the number of ions from one mole solute, (in this case = 3), α the degree of dissociation. i = (1 + 2α)

Q. If a is the degree of dissociation of $N a_{2} S O_{4}$ , the van’t Hoff factor (i) used for calculating the molecular mass is :

$1 - 2 α$

$1 + 2 α$

$1 - α$

$1 + α$

$N a_{2} S O_{4} ⇌ 2 N a^{+} + S O_{4}^{2 -}$
van’t Hoff factor $i = [1 + (y - 1) α]$
where $y$ is the number of ions from one mole solute, (in this case $= 3$ ), $α$ the degree of dissociation. $i = (1 + 2 α)$

Q. If a is the degree of dissociation of Na2​SO4​, the van’t Hoff factor (i) used for calculating the molecular mass is :

1−2α

1+2α

1−α

1+α