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1. How much salt and how much water must be mixed to make 250 g brine solution that is 50% salt by mass? 2. An isotonic saline solution was prepared by dissolving 0.92 g of NaCI in enough distilled water to make 100 ml solution. What is the percent by mass/volume of the solution? 3. 0.5 M KOH is one of the reagents needed in the qualitative determination of stimulant cathartic anthraquinone in plants. How many grams of KOH are required to prepare 1L solution? MW KOH = 56 g/mol 4.In analyzing the crude fiber content of a certain food, 0.313N NaOH is required. What is the mass of NaOH pellets needed to prepare 500ml of the solution? What is the molarity of the solution? 5. What is the molality of a 10% by mass NaCl solution when used in qualitative determination of tannins in plants?
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