Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter15: Equilibria Of Other Reaction Classes
Section: Chapter Questions
Problem 11E: The Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities...
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EX 2.
Given->
Volume of Na+ = 500 ml
Molarity of Na+= 0.0100M
Molar mass of Na2CO3 = 105.99 gm/mole
Millimole of Na+ = molarity × volume
Number of millimole = 0.0100 × 500
= 5 millimole
Na2CO3 ---> 2Na+ + CO32-
Millimole of Na2CO3 = millimole of Na+/2
Millimole of Na2CO3 =5/2 = 2.5 millimole
Mole of Na2CO3 = 2.5 × 10-3mole (1 mole = 10^3 millimole)
Weight of Na2CO3 required = mole × molar mass
= 2.5 × 10-3 × 105.99
=0.26 gm
Hence, 0.26 gm Na2CO3 must dissolve in 500 ml of water.
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