University:
Georgia Southern University
Course:
CHEM 1310 | Comprehensive General Chemistry
Academic year:

2024
Views:

392

Pages:

1
Author:

Jalen W.

Primer Concentration Units & Solution Making A. Concentration of Solutions Concentrations – looking at the amount of solute for a given amount of solvent to form a solution 1. Molarity – moles of solute per liter of solution, (M) Formulas: Ma x Va = moles of a Ma x Va = grams of solute a/mol. Mass of a NOTE: To go from Ma to Mb must use stochiometric ratio 2. Parts per hundred (w/w percent): 20 grams of NaCl in 80 grams of water = 20% (w/w) solution of NaCl 3. Parts per million (ppm): 1 ppm = 1 g solute/1 x 106 g water or 1 mg solute. 1 x 103 g water or 1 mg solute/ 1 L water 4. Parts per billion (ppb): 1 ppb = 1 g solute/1 x 109 g water or 1 g solute. 1 x 103 g water or 1 g solute/ 1 L water B. Solution preparation: 1. Preparing a solution from solid How to prepare a 1.00 M NaCl solution; NOTE: 58.5 g NaCl is not added to 1.00 L of water because the 58.5 grams of NaCl will take up volume as it dissolves in the water - resulting in slightly more than 1.00 L of solution, thus the actual molarity (M) of the solution to be lower than 1.00M 2. Dilution - preparing a less concentrated solution from a more concentrated solution. Formula: C1 V1 = C2 V2