1. What is the ionic strength of a solution composed of 0.M NaCl and 0.2M Na2SO4?
"NaCl \\rightarrow Na^++Cl^-"
Let concentration of NCl is 0.1 M
Then concentration of Na+ is 0.1 M
And consideration of Cl- is 0.1 M
"Na_2SO_4 \\rightarrow 2Na^++SO_4^{2-}"
If concentration of "Na_2SO_4" is 0.2 M,
Then concentration of Na+ is 0.2x2=0.4 M
And consideration of "SO_4^{2-}" is 0.2 M
If we have 1 l of this solution total concentration of Na+ is 0.1+0.4=0.5M
"I=0.5\\sum c(z)^2=0.5(0.5(1)^2+0.1(-1)^2+0.2(-2)^2)=0.7 M"
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