11/7/2016 07:30 AM A 2.6/3 Gradebook Calculator Periodic Table Incorrect Incomec

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11/7/2016 07:30 AM A 2.6/3 Gradebook Calculator Periodic Table Incorrect Incomect a inoorrect Incorrect Sapling Learning The flask shown here contains 10.0 mL and a few drops of The buret contains M What volume of NaOH is needed to reach the end point of the titration? Number mL NaOH 11.9 What was the initial concentration of HCl? Number .28 M HCI You may have gone past the end point of the titration, or you may be reading the volume in the buret incorrectly. Be sure to stop the titration after a single dro from the buret causes the solution in the flas to turn pink and stay pink. O Previous Try Again 0 Next

Explanation / Answer

We take volume of NaOH from bute is 10ml

NaOH   + HCl ---------> NaCl + H2O

1 mole      1 mole

HCl                                              NaOH

M1 =                                           M2 = 0.12M

V1 = 10ml                                 V2 = 10ml it is taken from diagram

n1 = 1                                          n2 =1

        M1V1/n1     =    M2V2/n2

             M1        = M2V2n1/n2*V1

                          = 0.12*10*1/1*10

                          = 0.12M >>>>> answer

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