Water_Notes_and_WS

# The measurement of a solutes ability to dissolve is

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The measurement of a solutes ability to dissolve is called solubility . Factors that affect the rate of solubility are temperature and pressure; both have direct relationships with solubility. Solubility Rule- It should be noted that like dissolve likes. Meaning polar molecules (water) will dissolve ionic crystals and other polar molecules. Non-polar molecules will dissolve only other non-polar molecules. Text Reading Assignment. pp.471-477 Questions from reading: 1. Describe what steps you can take in order to get a 1.0 cm 3 sugar cube to dissolve in a glass of water at room temperature more easily. 2. Compare & contrast miscible and immiscible. 3. What is a saturated solution? 4. How can you get a solution supersaturated? 5. Explain why you see more CO 2 bubbles when a bottle of soda is opened. Page 2 of 8

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Name_________________________ Molarity Concentration is described through the measurement of molarity. Molarity (M) = moles of SOLUTE liters of SOLUTION If you dissolve 25 g of NaCl into enough water to make 0.25 L of solution, what is the concentration of the solution? If you have 0.5 liters of a 10 M solution of sugar water, and you allow the water to evaporate, how many grams of sugar will remain? Many times you need to dilute a stock solution to a desired molarity . In this case the number of moles of solute remains the same, however the liters of solvent increases and thus the molarity decreases according to the following equation: (Molarity * Volume) soltn 1 = (Molarity * Volume) soltn 2 You have a 12 M stock solution of HCl. The experiment requires 0.25 L of 2.0 M HCl, how much stock solution is required? If you have 0.5 L of 10 M NaOH, how much 3M solution can you make? Questions: 1. What is the molarity when 10 moles of solute make a total of 5 L of solution? A total of 10 L of solution? Page 3 of 8
Name_________________________ 2. If you add 50.0 g of CuSO 4 to make a total of 0.5 L of solution, what is the molarity of the solution? 3. If you require 0.10 L of 2M salt water solution, how many grams of salt should you dissolve in the water?

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