# Solublity VS Temprature

Mar 29th, 2015
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At what temperature is a saturated solution of NH4Cl at an approximate concentration of 7.5 M?

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Molarity The most common unit of solution concentration is molarity (M). The molarity of a solution is defined as the number of moles of solute per one liter of solution. Note that the unit of volume for molarity is liters, not milliliters or some other unit. Also note that one liter of solution contains both the solute and the solvent. Molarity, therefore, is a ratio between moles of solute and liters of solution. To prepare laboratory solutions, usually a given volume and molarity are required. To determine molarity, the formula weight or molar mass of the solute is needed. The following examples illustrate the calculations for preparing solutions. If starting with a solid, use the following procedure: - Determine the mass in grams of one mole of solute, the molar mass, MMs. - Decide volume of solution required, in liters, V. - Decide molarity of solution required, M. - Calculate grams of solute (gs) required using equation 1. eq. 1. gs = MMs x M x V - Example: Prepare 800 mL of 2 M sodium chloride. (MMNaCl = 58.45 g/mol) gNaCl = 58.45 g/mol x 2 mol/L x 0.8 L gNaCl = 93.52 g NaCl Dissolve 93.52 g of NaCl in about 400 mL of distilled water, then add more water until final volume is 800 mL. If starting with a solution or liquid reagent: - When diluting more concentrated solutions, decide what volume (V2) and molarity (M2) the final solution should be. Volume can be expressed in liters or milliliters. Basic Concepts of Preparing Solutions Many of the reagents used in science a

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