Dissolving Process

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Introduction: You are aware that sugar dissolves in water but oil does not. What factors determine whether one substance will dissolve in another? A solvent is a substance that is capable of dissolving other substances and forming a homogeneous mixture called a solution. The substance dissolved is called the solute and is the component present in the smallest amount. The dissolving process involves a consideration of the relative strength of three intermolecular attractive forces. The type of forces between solute-solute molecules and solvent-solvent molecules must be considered. These intermolecular attractions must be broken before new solute-solvent attractive forces can become effective. A solute will dissolve in a solvent…show more content…
Place 5 mL of water in each of three test tubes. Add 1 mL of glycerol to the first test tube, two small iodine crystals to the…show more content…
Which part of a water molecule is attracted to a cation (positive ion)? 14. Why won't non-polar compounds dissolve in water too? Or why doesn't salt (NaCl) dissolve in hexane? Consider two groups of people - your friends, and your acquaintances. In the absence of friends, you interact fine with acquaintances, but the attraction isn't strong. When friends are around, then your interaction with them is so strong, that it excludes acquaintances. Now consider two groups of molecules - other water molecules like yourself, and butanol molecules. In the absence of other water molecules, you interact fine with butanol, but the attraction isn't strong. When more water is around, then your interaction with that is strong, and so the butanol is excluded. Do demo while describing Thus, it is not so much that non-polar compounds can't interact with water as much as that the interaction of water with other water molecules (hydrogen bonds) is much stronger. 15. Now explain why NaCl won't dissolve in hexane (a non-polar solvent) using a similar thought process. 17. Within each pair of compounds, pick the one more likely to be soluble (mix) with water.

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