Question $5)$ The total interaction curves for $A{l}_2{O}_3$ in water with three different NaCl electrolyte

concentrations $(C_1,C_2,C_3)$ are given in the following plot. Use the given plot to answer the

questions. $(\%20)$

a$)$ Which of the following statements could be true? Why?

i$.C_1=1$MNaCl,$C_2=0\mathrm{.}02$MNaCl,$C_3=0\mathrm{.}001$MNaCl$\%5)$

ii$.$ Electrolyte concentration of $C_1$ completely eliminates any repulsion $(\%5{)}_{?}$

iii. For $C_3$ the effective barrier can stabilize the suspension. $(\%5)$

b$)\text{'}$ the concentration of NaCl electrolyte in a solution will

Debye length, and eventually the electric double layer $($EDL$)$ will

the

$($Fill in the blanks with the correct form of words given: $($decreasing$,$ decrease, expand,

collapse, increasing, increase,$)$