Question: The figure below shows the DLVO interaction force versus the separation between two colloidal particles in 1 mM NaCl and 1 M NaCl solution. a)

The figure below shows the DLVO interaction force versus the separation between two colloidal particles in 1 mM NaCl and 1 M NaCl solution.

a) Identify which curve corresponds to 1 mM NaCl and which one to 1 M NaCl. (1 point)

b) At what separations is the interaction between the particles repulsive in curves A and B? (2 points)

c) Explain why the shape of the curves is different at different NaCl concentrations. (2 points)

The figure below shows the DLVO interaction force versus the separation between

0.08 0.04 A DLVO force (nN) 0.00 B -0.04 -0.08 05 10 15 20 25 30 35 40 45 Separation (nm)

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