Chemistry - Acids and Bases

• Audi

  21 Aug 09, 21:13

  The table below shows the results of experiments to measure the volume of dilute H2SO4  needed to neutralize the mass of NaOH dissolved in the volume of water

   

  Expt        Vol of H2SO4 acid required     Mass of NaOH/g       Vol. of water/cm3

  1                     20                                              1                                  20

  2                     40                                              2                                  40

  3                     40                                              2                                  20

  4                      ?                                               1                                   40

   

  From these results, what is the volume of H2SO4 needed to neutralize NaOH in the 4th experiment?

  Answer is 20cm3

  I have difficulties interpreting data set 2 and 3. Why is it that when NaOH is dissolved in the different volumes of water, the volume of H2SO4 needed for neutalization remains the same? And how do I obtain the answer for experiment 4? How does result for experiment 1 actually give clues as to how to get answer for expt4? (Lots of unanswered questions in my head actually)

  A big thanks!

• UltimaOnline

  21 Aug 09, 21:19

  Coz it's essentially no. of moles, not molarity, of H+ from the acid and OH- from the alkali, that features in the stoichiometry of the neutralization calculations.