Question
Thu January 03, 2013 By:

A SAMPLE OF NaOH WEIGHING 0.38g IS DISSOLVED IN WATER & SOLUTION IS MADE UP TO 0.05L IN A VOLUMETRIC FLASK. WHAT IS MOLARITY OF RESULTING SOLUTION?

Expert Reply
Fri January 04, 2013
To calculate the molarity (c) of the solution, we need the molar amount of the solute and the volume of the solution. The volume (50 mL) is given. To calculate the molar amount, we use the following equation: m  = n × M.W., that is
 
n = m/ mw =40 g/mol0.38 g = 0.0095 mol = 9.5 mmol.
 
Molarity = n/ V = 9.5 mmol/ 50 cm3= 0.19 M 
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