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Solutions: 41. Calculate the quantity of grams found in 250 mL of a 15% w/v solution of NaOH. 42. Calculate the quantity of grams found in 475 mL of a 30% w/v solution of KCL. 43. How many mL of a 90% ethyl alcohol solution are needed to prepare 150 mL of a 10% ethyl alcohol solution? 44. Determine the quantity of stock 75% EtOH required to prepare 300 mL of a 25% EtOH solution. 45. Determine the concentration of a solution if 300 mL of a 20% buffer solution was diluted to a final volume of 1000 mL.
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