CBSE Class 11-science Answered
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 | 03 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 | 04 Jan, 2013, 10:49: AM
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