Four U Tubes each have distilled water in the right arm, a solution in the left arm, and a semipermeable membrane between arms. A. If the solute is NaBr, which solution is least concentrated? B. If each solute is different but all the solutions have the same molarity, which contains the largest number of dissolved ions?

Answer (a) C

             (b) B

Explanation:

Attached to this answer is a picture to explain better the answer provided

(a) If solution and pure solvent are both separated by semi- permeable membrane, osmosis is said to occur from  higher concentration to lower concentration of solvent . The solution with the least concentration will absorb least amount of H2O

In the attached file tube C will absorb the least amount of H20, therefore the least concentrated solution is C

(b)The largest number of dissolved ions is said to be in the solution that absorb maximun amount of H2O because osmotic pressure is said to be high in it.

Tube B has the highest number of dissolved ions

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