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Ch10 worksheet key

# Ch10 worksheet key - CH101/Ison Ch10 Worksheet Name I...

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CH101/Ison Ch10 Worksheet Name: ___________, ________ I. Solutions: -Homogeneous (uniform throughout). -The amount of solute in solvent is described by molarity (M or mol/L) Practice problems: 1. Calculate the molarity of a solution made with 0.24mol MgCl 2 in 200ml water. 2. What are the [Mg 2+ ] and [Cl 1- ] in this solution? MgCl 2 Mg 2+ + 2Cl 1- 3. How many grams of KCl would it take to make 25ml or a 0.1M solution of KCl? II. Solvation: Consider the process or NaCl dissolving in water. What is the solute? NaCl What is the solvent? water Three steps in the dissolution process: 1. Solute ions separate. What is the sign of ∆H of the solute? (+) 2. Solvent ions separate. What is the sign of ∆H of the solvent? (+) 3. The solute ions and solvent mix. What is the sign of ∆H of mixing? (-) III. Solubility: -Solids can be soluble or insoluble -Liquids can be miscible or immiscible -Ionic solids and polar molecules will dissolve in polar solvents -Non-polar molecules will dissolve in non-polar solvents.

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