this is all Solutions, Electrolytes, and Concentration Report Sheet -Lab 15 Name

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Solutions, Electrolytes, and Concentration Report Sheet -Lab 15 Name Date Section Instructor Team Pre-Lab Study Questions 1. Why does an oil-and-vinegar salad dressing have two separate layers? 2. What is meant by the mass/mass percent concentration of a solution? 3. Why are some electrolytes strong, while others are weak? 4. What is molarity? A. Polarity of Solutes and Solvents Identify the Solute as Polar Soluble/Not Soluble in Water (A.1) Cyclohexane (A.2) or Nonpolar (A.3) Solute KMnO4 Sucrose Vegetable oil Questions and Problems Q.1 NaCl is soluble in water, but I2 is not. Explain. 153

Explanation / Answer

1. In salad dressing oil and vinegar have two separate layers because they have different chemical properties. Oil is non polar and less dense in nature while vinegar is polar and more dense in nature. Moreover, we know like dissolves like.

So a polar substance will not dissolve a nonpolar substance.thus oil being non polar and less dense floats on vinegar (more dense) which settles at the bottom.

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