The question is: Suppose another student attempts to do an ion exchange on a col

Question

The question is: Suppose another student attempts to do an ion exchange on a column that is already nearly saturated with Co2+ and Zn2+. Will his calculated % Co be high or low? Explain clearly.

PROCEDURE A) Reduction 1) Accurately weigh about 0.7 to 0.8 grams of green crystals and dissolve it in approximately 20 mL DI water in a small beaker. Record the mass of green crystals in your lab notebook. 2) Note the color of the solution. 3) Add 0.4 grams of powdered zinc metal to the beaker. 4) Swirl occasionally for about 30 minutes. Note any color changes. 5.) Decant the solution into a 50.00 mL volumetric flask, trying not to pour the remaining zinc into the volumetric flask. Be sure to rinse the remaining zinc powder with DI water (5 mL three times) and decant this rinse into the volumetric flask too. Finally, dilute to the mark with DI water and mix well. Note: Only one 50.0 mL volumetric flask per student. B Ion Exchange 1) Set-up an ion-exchange column as shown in Figure 3. Mount an ion-exchange column on a ring stand using a buret holder. Using the open end of an empty buret, push a small wad of glass wool or cotton ball into the column. There should be 2 cm of glass wool or cotton at the bottom of the column. Pour the resin slurry into the column over the glass wool. The column should be from 1/2 to 2/3 of the way full. Your TA will help you get the resin into the column If any resin is spilled in this process, clean it up immediately. When dried, the beads on the floor are dangerous because they are very slippery. Liquid must cover resin throughout the ion-exchange process. ALWAYS keep the water level in the column higher than the resin level. Check for air bubbles and channels. (If an air bubble is in your column, seal the top with a cork and gently rock the column back and forth horizontally several times.) When you pour more DI water into the column, check that the effluent (liquid dripping out of the column) is acidic with blue litmus paper. When the effluent is acidic, the resin is "charged" with H ions. If it is not acidic, you must regenerate the resin first (see Regeneration Step 6). -liquid level -ion-exchange resi glass wool FIGURE 3 80

Explanation / Answer

It seems that the calculated % of cobalt will be high

However we need to know the exact initial concentration of the solute we are going to pass through the ion exchange column. We also need the ionic conductances (specific) of the ions to answer.

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