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THoneymoon x Ga Blackboard L x D bboard2010 x E-Mail Accesx E Sign into yo x C Chegg Study x My GRE My x GILove Kanye x CHEM 1215 X /ibiscms/mod/ibis/view.php?id-2501029 WWW sapling learning.com Sapling Learning Sapling Learning My Assignment Resources 4/25/2016 11:55 PM 61.9/100 O Assignment Information Calculator Periodic Table Available From: 4/10/2016 06:00 PM 4/25/2016 11:55 PM 7 of 8 Incorrect Points Possible: 100 Map Dab General Chemistry Grade Category: Graded Description Phosphoric acid is a triprotic acid (Kat 6.9x10 3, Ka2 6.2x 10 8, and Ka3 4.8x10-3. To find the pH of a buffer c H2PO d HP q), which pKa vi d you u You can check your answers the Henderson-Hasselbalch equation? You can view solutions when you complete or give up on any question. O pKal 2.16 You can keep trying to answer each question until pKa2 7.2 O pKa3 2.32 O Help With This Topic Calculate the pH of a buffer solution obtained by dissolving 10.0 g of KH2PO4(s) and 24.0 g of Na2HPO4(s) Web Help & Videos in water and then diluting to 1.00 L O Technical Support and Bug Reports Incorrect Use the molar masses of KH2PO4(s) and Na2HPO4(s) to convert Number from grams to moles of each solid. Then, divide each result by H 0.36 1.00 L to get a molar concentration. Finally, apply the Henderson-Hasselbalch equation where HPO. is the base base pH pKa log and H2PO4 s the acid acid Previous Give Up & View Solution 8 Try Again Next Exit careers partner prhag polly terms ofuse contact us m Cortana. Ask me anything Logout 4/25/2016Explanation / Answer
pH = pKa2 + log(HPO4-2/H2PO4-)
pK22 = 7.2
mol of KH2PO4 = 10/136.086 = 0.0735
mol of Na2HPO4 = 24/141.96 = 0.16906
pH = pKa2 + log(HPO4-2/H2PO4-) = 7.2 + log(0.16906 /0.0735) = 7.5617
pH = 7.5617
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