02 HW - Concentration

02 HW - Concentration - 4. If a 3.0 g water sample has 12...

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Name: __________________________________________ Date: ____________ WKST #7: Measuring Concentration (40 points) Period: ___________ Follow the procedure below to answer each of the long answer questions to receive full credit. Write the formula – it’s alright to use abbreviations, just make sure they make sense! Substitute the appropriate numbers Solve the problem and include the appropriate units Place a BOX around your answer so I can find it easily 1. If I make a solution by adding water to 75.0 mL of isopropanol (rubbing alcohol) until the total volume of the solution is 375 mL, what’s the percent by volume of isopropanol in the solution? 2. A solution is made by dissolving 55.0 g of potassium iodide in 300.0 g of water. What is the percent by mass of potassium iodide in the solution? 3. A solution is comprised of 6.0 moles of salicylic acid and 25.0 moles of water. What is the mole fraction of salicylic acid in the solution?
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Unformatted text preview: 4. If a 3.0 g water sample has 12 mg of lead present, what is the concentration of lead in ppm? 5. What is the molarity of a 450 mL solution that contains 200 grams of iron (II) chloride? 6. How many liters of 4.0 M solution can be made using 100.0 grams of lithium bromide? 7. You are making 6.7 L of 4.5 M ammonium nitrate. How many grams of ammonium nitrate do you need for this solution? 8. If 112 g of sodium acetate are dissolved in enough water to make 1.50 L of solution… a. What is the molarity this solution? b. What is the percent by mass of sodium acetate in this solution? Assume 1.5 L of water was used to make the solution. c. What is the mole fraction of water in this solution? Challenge Question! (5 points) A solution of ethanol (C 2 H 5 OH) in water is prepared by dissolving 75.0 mL of ethanol (density = 0.79 g/mL) in enough water to make 250.0 mL of solution. What is the molarity of ethanol in this solution?...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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02 HW - Concentration - 4. If a 3.0 g water sample has 12...

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