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worksheet 9

# worksheet 9 - Worksheet#9 Calculating Molarity 1 What is...

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Worksheet #9 Calculating Molarity 1. What is the molarity of 950 mL of solution containing 22.4 g of silver nitrate? 2. What is the concentration of a solution that has 4.87 g of potassium permanganate dissolved in 187 mL of water? 3. Which of the following has the highest concentration of Na + : a) 1.80 g Na 2 SO 4 in a) 55.0 mL H 2 O; b) a solution containing 1.05 g NaCl/100 mL; c) a solution having 14.7 mg Na + /mL? 4. Determine the mass of MgCl 2 contained in a 35.0 mL aliquot of 0.241 M MgCl 2 solution. 5. How many Mg 2+ ions are present in 1.3 mL of 0.184 M magnesium nitrate? 6. How much methanol (CH 3 OH, d=0.792 g/mL) in mL, must be dissolved in water to produce 22.5 L of 0.485 M methanol? Dilutions 7. How many liters of 12.0 M nitric acid are needed to make 4.00 L of a 4.39 M solution? 8. A stock solution of sodium hydroxide has a concentration of 5.00 M. How many mL of it are required to make 355 mL of a 1.35 M solution? 9. A dilution was prepared using a stock 2.50 M NaCl solution. A 20.00 mL aliquot was added to a 250.0 mL volumetric flask, which was then filled to the mark with deionized water.

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