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?

Asked by  | 3rd Jan, 2013, 11:18: PM

Expert Answer:

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 

Answered by  | 4th Jan, 2013, 10:49: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.