You are trying to determine which ions are present in a sample. If you use ion chromatography, you will need to analyze the anions and the cations separately.  Why is this so?  If you use capillary electrophoresis you can analyze all of the ions in a single run. Why is this so?

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Using the sodium chloride equivalent method, make the following solution isotonic with respect to the mucous lining of the eye (ocular membrane): Tetracycline hydrochloride: 10 g NaCl: x g Sterile distilled water, enough to make 1000 mL Report your answer in grams (to one decimal place).

You set up an experiment where you place a sealed (clamped) dialysis tube cell in a beaker of water. The solution in the dialysis tube cell is 25%NaCl solution and the solution in the beaker is 1%NaCl solution. The solvent for both is water.    Before you place the tube in the cell, after it has been filled and clamped, you find the mass of the ‘cell’ after carefully drying off any water on the outside or on the clamps. You also find the mass of the cell after it has been placed in the beaker solution for 30 minutes after carefully drying off the outside of the ‘cell’ and clamps. The masses are in the table below.      Mass in grams of dialysis tube cell  Initial Mass  25.0g  Final Mass after 30 minutes  28.7g    Using this information, explain the difference in mass before and after submerging the cell in the beaker solution for 30 minutes.