In water, Na3ASO4 dissociates into Na+ and AsO ³. AsO ³- is a polybasic ion and ionizes in water. If 40.00 g of Na3ASO4 is dissolved in 10.00 L of water, what is the pH of the resulting solution? For ASO² Kb1 = 3.3 x 10-³, Kb2 = 9.1 x 10-8 and Kb3 = 1.7 x 10-¹2.
In water, Na3ASO4 dissociates into Na+ and AsO ³. AsO ³- is a polybasic ion and ionizes in water. If 40.00 g of Na3ASO4 is dissolved in 10.00 L of water, what is the pH of the resulting solution? For ASO² Kb1 = 3.3 x 10-³, Kb2 = 9.1 x 10-8 and Kb3 = 1.7 x 10-¹2.
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter19: The Chemistry Of The Main-group Elements
Section: Chapter Questions
Problem 89QRT
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Transcribed Image Text:In water, Na3ASO4 dissociates into Na+ and AsO ³. ASO³- is a
polybasic ion and ionizes in water. If 40.00 g of Na3ASO4 is dissolved
in 10.00 L of water, what is the pH of the resulting solution? For
ASO₂² Kb1 = 3.3 x 10-³, Kb2 = 9.1 x 10-8 and Kb3 = 1.7 x 10-¹².
Expert Solution
Step 1
Given that
Mass of Na3AsO4 = 40.00 g
Molecular weight of Na3AsO4 = 207.89 g/mol
Number of moles of Na3AsO4 = mass/mol.wt. = 40.00 g/(207.89 g/mol) = 0.19241 mol
Volume = 10.00 L
Molarity of Na3AsO4 = moles / volume in L = 0.19241 mol / 10.00 L = 0.019241 M
1 mole of Na3AsO4 given 1 mole of AsO4–3 ions.
So, [AsO4–3] = [Na3AsO4] = 0.019241 M
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