membrane physiology question

[Master Yoda]

Can someone explain why the answer is B?

A semipermeable membrane encloses a solution of 10 mM NaCl and 5 mM KCl. This “cell” is placed into a solution of 6 mM CaCl2 and 6 mM NaCl.

A) The “cell” will be hypertonic to the surrounding solution.
B) The “cell” will be isotonic to the surrounding solution.
C) The “cell will be hypotonic to the surrounding solution.
D) The “cell” has a lower hydrostatic pressure than the surrounding solution.
E) Not enough information is provided to answer the question.

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[510586]

10 mM * 2 (NaCl has 2 components) + 5 *2 (K and Cl) = 20+10=30
CaCl2=3 components*6 mM + 6 * 2(NaCl) = 18+12=30.
Same cxn so isotonic

 

[Master Yoda]

10 mM * 2 (NaCl has 2 components) + 5 *2 (K and Cl) = 20+10=30
CaCl2=3 components*6 mM + 6 * 2(NaCl) = 18+12=30.
Same cxn so isotonic

Thank you