8 11:55PM 0 2/33/3/2018 09:35 PM Print Calculator Periodic Table t 3 pling Learn

Question

8 11:55PM 0 2/33/3/2018 09:35 PM Print Calculator Periodic Table t 3 pling Learning mL The flask shown here contains 0.130 g of acid and a few drops of phe contains 0.120 M NaOH. indicator dissolved in water. The buret 10 15 10 15 What volume of base is needed to reach the end point of the titration? 25 30 35 Number 0.00072 mL base Assuming the acid is monoprotic, what is its molar mass? to the solution u just turhs pink. You may need to reset the titrationi you go past the end point. g/mol OPrevous ®Give Up & View SoutonCheck Anner O Net It F1 F4 F5 F6 F9

Explanation / Answer

The volume of NaOH = 10.225ml

HA      +     NaOH -------------> NaA + H2O

1 mole        1 moles

no of moles of NaOH = molarity * volume in L

                                   = 0.12*0.010225

                                  = 0.001227moles

1 mole of NaOH react with 1 mole of HA

0.001227moles of NaOH react with 0.001227 moles of HA

molar mass of HA = mass of HA/no of moles of HA

                              = 0.13/0.001227   = 106g/mole

molar mass of acid = 106g/mole

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