The Baumé scale is a measure of a solution's specific gravity, not its concentration. To get the molarity of the HCl, you'll have to convert degrees Baumé to a specific gravity, and then use the specific gravity to look up the concentration of HCl from a table in a handbook. For example, the CRC handbook has tables that relate specific gravities to concentrations for sulfuric acid.
|Pure water||15 (w/w)% NaCl|
|Calibration of a heavier-than-water|
hydrometer on the Baumé scale.
At 60°F, specific gravity can be calculated from degrees Baumé using the following formulas:
|liquids lighter than water:||sp. gr. = 140/(°Bé + 130)|
|liquids heavier than water:||sp. gr. = 145/(145 - °Bé)|
Although the Baumé scale is almost never mentioned in chemistry courses, tradesmen often use it as a convenient way to check solution concentration. For example, U. S. Grade A honey must have a Baumé reading of at least 42.49°Bé at 60°F. Recipes for lowering the pH of pool water call for 20°Bé hydrochloric acid. It's also used by brewers for checking the density of sugar solutions before fermentation.
Author: Fred Senese email@example.com
Copyright © 1997-2010 by Fred Senese
Comments & questions to firstname.lastname@example.org
Last Revised 02/23/18.URL: http://antoine.frostburg.edu/chem/senese/101/measurement/faq/print-baume-scale.shtml