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Blackboard Lea x Ea The Expert TA x D privacy error x plaid Blazer x C Chegg Study C x CHEM 1215-GX a Amazon.com: x Ba Hanayome Mer x Undertaker Att x M 12 /ibiscms/mod/ibis/view.php?id-2501028 WWW sapling learning.com Sapling Learning Sapling Learning CHEM 1215-General Chemistry I-Wickham Activities an My Assignment Resources 4/20/2016 11:55 PM A 789/100 Gradebook O Assignment Information Attempts Score Print HCalculator Periodic Table Available From: 4/10/2016 06.00 PM 4/20/2016 11:55 PM Due Date: Question 6 of 11 Points Possible: 100 Map Dab Grade Category: Graded Description Calculate the concentrations of all species in a 1.60 MNa2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Kat 1.4x 10 and Ka2 6.3x10 8 You can check your answers. You can view solutions when you complete or give Number up on any question. You can keep trying to answer each question until you get it right or give up You lose 5% of the points available to each answer in your question for each incorrect attempt at that O Help With This Topic Number Web Help & Videos O Technical Support and Bug Reports Number Number Previous 3 Give Up & View Solution Check Answer Next Exit careers partner prhag polly terms ofuse contact us m Cortana. Ask me anything O Logout Help 3:33 PM 4/20/2016Explanation / Answer
Sodium sulfite dissociates completely to form Na+ ions with a concentration of 3.2M, and bisulfite ion with a concentration of very nearly 1.6M. The concentration of hydroxide ion is also 1.6M. This is why a solution of sodium sulfite is basic.
Na2SO3 + H2O <==> 2Na+ + HSO3- + OH-
The remaining species are essentially negligible.
HSO3- <==> H+ + SO3- ............ Ka = 6.3x10-8
1.6M ......... 0 .......0
-x ................+x ......+x
1.6M-x .......x ........x
Ka = [H+][SO32-] / [HSO3-]
6.3x10-8 = x² / 1.6 ............ assuming 1.6-x = 1.6 since x is small
x = 3.17x10-4
[SO32-] = 3.17x10-4 M
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