Prairie View A & M Univer X 4.59 g C WWW sapling learning.com /ibiscms/mod/ibis/

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Prairie View A & M Univer X 4.59 g C WWW sapling learning.com /ibiscms/mod/ibis/view.php?id-1973899 O Not set A 69.6/100 O 9/9/2015 11:35 AM Gradebook tempts Score Print Calculator Periodic Table 95 Questi 2 of 27 Map The flask shown here contains 10.0 mL of HCI and a few drops Reset of phenolphthalein indicator. The buret contains 0.270 M NaOH 25 What volume of NaOH is needed to 95 reach the end point of the titration 20 30 25 1.35 mL NaOH 35 35 40 45 What was the initial concentration of HCI? M HCl 35 Previous Give Up & View Solution Check Answer Next Exit Copyright 2011 2015 Sapling Learning, Inc. 190 tact a Search the web and Windows Assignment Information Available From 8/24/2015 06:00 PM Due Date Set Points Possible 100 Grade Category: Graded Description: Policies: Homework heck y w solutions when you complete o up on any question n keep trying to answer each question u you get it right or give up 5% e points available to each answer n your question ct att O eTextbook OHelp With This Topic Web Help & Videos O Technical Support and Bug Reports 4:12 AM 9/12/2015

Explanation / Answer

1)

Volume of NaOH needed to reach end point is = 29 mL                  (from picture)

2)

concentration of NaOH = 0.270 M

volume of NaOH = 29 ml

millimoles of NaOH = 0.270 x 29

                   = 7.83

at equivalence point

millimoles of NaOH = millimoles of HCl

0.270 x 29 = 10 x M

M = 0.783 M

initial concentration of HCl = 0.78 M

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