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March 25, 2017

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Please could you help me predict the products of the following reactions: ( I cant figure them out) THANX in advance!

1) CaO powder is added to distilled water.
2) Acetic acid solution is added to solid sodium hydrogen
carbonate.
3) Potassium permanganate solution is added to acidified
oxalic acid solution.
4) A piece of metallic aluminium is dropped into a solution of copper (II) chloride.

  • AP CHEMISTRY - ,

    Here are some rules that helped me as I went through school. None of the equations are balanced. These look better if you place them on a sheet of paper with arrows but I can't do that on this forum. Something like this:
    .................Elements.............
    ...............|.........|
    ..........metals.......non-metals
    ..........+.............+...........
    ..........O2............O2
    ..........|.............|(arrows here)
    ..........v.............v
    ........metal oxide...non-metal oxide
    ..........+.............+
    .........H2O...........H2O
    ..........|.............|
    ..........v.............v
    ..........base..........acid

    Then draw arrows from one to the other to show these reactions.
    acid + base ==> salt + water
    example: HCl + NaOH ==> NaCl + H2O

    metal oxide + acid ==> salt + water
    example: CaO + HCl ==> CaCl2 + H2O

    non-metal oxide + base ==> salt + water
    example: CO2 + NaOH ==> Na2CO3 + H2O

    metal oxide + non-metal oxide ==> salt
    example: CaO + CO2 ==> CaCO3

    Here are example of each of the ones in the above table.
    metal + oxygen = metallic oxide
    example: Al + O2 ==> Al2O3

    non-metal + oxygen = non-metal oxide
    example: C + O2 ==> CO2

    metal oxide + H2O = base
    example: Na2O + H2O ==> NaOH

    non-metal oxide + H2O = acid
    example: SO3 + H2O ==> H2SO4

  • AP CHEMISTRY - ,

    For #2, carbonates and bicarbonates go to CO2 and H2O in acid soln.

    MnO4^- in acidified soln goes to Mn^2+. C2O4^= goes to CO2 in acid soln.

    For #4, a metal will displace any ion BELOW it in the activity series. Therefore, Al will go into soln and Cu^2+ will come out. Here is a site that gives the activity series.
    http://www.files.chem.vt.edu/RVGS/ACT/notes/activity_series.html

  • AP CHEMISTRY - ,

    Thank you very much

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