Colligative property question?

Question

How's the relation i = 1 + alpha deduced

For the question- pH of a 0.1M monobasic acid is found to be 2.Hence its osmotic pressure at a given temp T is the solution is:

[H+]=C*alpha 
Therefore alpha=0.01/0.1=0.1 
Now, 
i=alpha +1 
i=0.1+1 
i=1.1 
Osmotic pressure 
=CRTi 
=0.1RT1.1 
=0.11RT
So here what does i = alpha + 1 stand for? Any formula or ideas to deduce this or perhaps another way by which the question can be solved

Fern · Accepted Answer

The dissociation degree is the fraction of original solute molecules that have dissociated. It is usually indicated by the Greek symbol α. More accurately, degree of dissociation refers to the amount of solute dissociated into ions or radicals per mole. In case of very strong acids and bases, degree of dissociation will be close to 1. Less powerful acids and bases will have lesser degree of dissociation. There is a simple relationship between this parameter and the van 't Hoff factor i

Source: https://en.wikipedia.org/wiki/Dissociation_%28chem...

pH = 2 ; [H+] = 0.01

[HA] = 0.10

Degree of Dissociation; alpha = 0.01/0.10 = 0.10

Source:    https://en.wikipedia.org/wiki/Dissociation_%28chemistry%29

pH = 2 ;  [H+] =  0.01
[HA] = 0.10
Degree of Dissociation; alpha = 0.01/0.10 = 0.10

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Colligative property question?

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