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Chemical Solutions

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More Lessons for High School Chemistry

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A series of free High School Chemistry Video Lessons.

In this lesson, we will learn

  • Types of Solutions
  • Solvation
  • Molarity - Molality

Types of Solutions
Solutions are homogeneous mixtures. Different types of solutions have solvents and solutes in different phases. Solutes are dissolved in the solvent. In a solution in which carbon dioxide is dissolved in water, the water is the solvent and the carbon dioxide is the solute. Two important concepts in studying chemical solutions are solution concentration and solubility equilibrium. Properties of solutions as a whole are called colligative properties.
How to recognize different types of solutions.
Types of Solutions: Variable Composition and Solubility

Types of Solutions: Solubility and Saturation
Solvation, also called dissolution, is the process of surrounding solute with solvent. It involves evening out a concentration gradient and evenly distributing the solute within the solvent.
The process of surrounding solute with solvent

Molarity - Molality
Molarity and molality are units of concentration. Molarity measures concentration in terms of moles per liter. A one molar solution has one mole of solvent for every one liter of solution. Molality, on the other hand, measures concentration in terms of kilograms per liter. A one molal solution has one kilogram of solvent for every one liter of solution. Molarity and molality are important in reactions in aqueous solutions and affects reaction rates.
Different ways to represent the concentration of a solution.
What's the difference between molarity and molality? They are both measures of concentration, but molarity has to do with volume (in Liters) and molality has to do with mass (in kilograms). Also, molarity talks about the volume of the total solution (solute and solution combined), and molality is about mass of the solute and solvent separately.

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