A binary surfactant solution contains DTAC (dodecyl trimethylammonium chloride) and CPC (Cetyl pyridinium chloride). The corresponding CMCs for the two surfactants are 2×10 ³M and 9×10 M. Make a plot of the CMC for mixtures of these surfactants versus the mole fraction of DTAC (hint: CMC of a mixture of surfactants varies as follows.) N? ?? -= cm Ci Where cm and N?, and Ci are the CMC of a mixture, the mole fraction of and the CMC of component i, respectively.

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A binary surfactant solution contains DTAC (dodecyl trimethylammonium chloride) and CPC (Cetyl pyridinium chloride). The corresponding CMCs for the two surfactants are

2 \times 1 0^{? 3} M

and

9 \times 1 0^{? 4} M

. Make a plot of the

CMC

for mixtures of these surfactants versus the mole fraction of DTAC (hint: CMC of a mixture of surfactants varies as follows.)

\frac{1}{c _{m}} = ?_{i} \frac{N _{i}}{C _{i}}

Where

c_{m}

and

N_{i}

, and

C_{i}

are the

CMC

of a mixture, the mole fraction of and the CMC of component

i

, respectively.

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