4. A lotion of 250 mL of 3% calamine lotion is to be prepared from a 7.5% calamine lotion. How many milliliters of stock solution (solute) are needed? How many milliliters of solvent are needed? 5. A stock pint of sodium bicarbonate contains 60% solution. The physician prescribes 1.5 L of 15% sodium bicarbonate solution. Hint: Just because the stock is provided in a pint bottle does not mean the whole pint will be used. How many milliliters of stock solution (solute) are needed? How many milliliters of solvent are needed? 6. A boric acid solution of 1:5 is available as a stock solution. A physician asks that you prepare 300 mL of 15% solution. How many milliliters of 1:5 strength boric acid are needed? How many milliliters of solvent (sterile water) are needed?
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5% calamine lotion, we need to calculate the amount of stock solution (solute) and the amount of solvent needed. Let's assume x mL of the 7.5% calamine lotion is needed. The amount of calamine in the 7.5% solution = 7.5/100 * x mL The amount of calamine in the 3% Show more…
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