Lab 4 - Solubility Rules

If an appreciable amount of the solid dissolves it is

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Unformatted text preview: er by a process known as dis s olution. If an appreciable amount of the solid dissolves, it is said to be s oluble . The ions are s olvate d by water, and free to move independently of each other in the solution. When two aqueous solutions of ionic substances are mixed, the mobile ions in each solution interact with each other. Coulomb's law describes the interaction between the ions (charged particles). ( 13 ) F=k· q1q2 εr2 where: F is the force that acts between the two ions, k (Coulomb's constant) is 8.9875 × 109 N · m2/C2, q1 and q2 are the charges on the ions, r is the distance that separates them, ε (epsilon) is the dielectric constant of the solvent.* www.webassig encheml1/lab_4/manual.html 2/5 4/15/13 Lab 4 - Solubility Rules * Water has a large dielectric constant, which reduces the electrostatic interaction between the particles. When the signs of the charges q1 and q2 are the same, F > 0 and the charges repel one another. When ions of opposite charge encounter one another, F < 0, and the ions are attracted to one another. When the attractive force between opposite charged ions is great enough to overcome the energetically favorable interaction between the ions and water, the ions combi...
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