wwwsapliinglearningx C HomelChegg.com xVG MUTOMBO FRANCC C Calculate The pH At x
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wwwsapliinglearningx C HomelChegg.com xVG MUTOMBO FRANCC C Calculate The pH At xA University of Kentu X /ibiscms/mod/ibis/view.php?id-2145667 WWW. Saplinglea rning com My Assignment Resources O /5/2015 11:55 PM A 63.4/100 0/31/2015 09:14 PM Assignment Information Gradebook Attempts Score Print Calculator dic Tab Available From: 0/20/2015 06:00 PM Questi 23 of 26 11/5/2015 11:55 PM Due Date Map 85 Points Possible 100 Grade Category: Homework Reset The flask shown here contains 0.481 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret Description: contains NaOH Policies: Homework 15 What volume of base is needed to reach the end 20 point of the titration? heck y 25 20 30 plete 35 up on any question mL base 40 45 You can keep trying to answer each question until you get it right or give up What is the molar mass of the acid (assuming it is diprotic and that the end point corresponds to You lose 5% of the points available to each answer the second equivalence point)? Add base to the solution until 20 it just turns pink. You may ct att need to reset the titration if Number you go past the end point. g mol O Help With This Topic Tools 23 Web Help & Videos 24 93 O Technical Support and Bug Reports 25 O Previous Give Up & View Solution Check Answer Next Exit 26 80 a 33 AM /3/2015Explanation / Answer
Here the amount of acid taken is not given so we consider that amount of acid taken = 25 ml
The mass of acid taken is given in grams so we need to convert it in moles, so 0.481 g of acid = 0.0049 M of acid
Volume of base is needed to reach the end point of the titration
If we assume that m1 and v1 are mass and volume of acid respectively and M2 and v2 are mass and volume of base then,
M1V1=M2V2
0.0049 X 25 = 0.110 X V2
V2 = 1.11 ml
Assuming diprotic acid
H2A + 2 NaOH = Na2A + 2 H2O
moles H2A = 0.00121/2 =0.000605
molar mass = 0.0049/ 0.000605=8.0 X 102 g/mol
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