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Questions on Gen Chemistry... Please help

Discussion in 'DAT Discussions' started by elaine07, Apr 9, 2007.

  1. elaine07

    elaine07

    7
    0
    Apr 2, 2007
    HI guys... I'm new in here.. I did couple practice problems and this is what I got... Please help me verify my answer... if it's incorrect, please explain for me? Chemistry was 12 yrs ago for me... Thanks a lot.



    1) Which of the following statement correctly describes the hydronium-hydroxide balance in the given solution?

    A) A bases, [OH-] = [H3O+]
    B) In bases, [OH-] is greater than [H3O+]
    C) In acids, [OH-] is greater than [H3O+]
    D) In bases, [OH-] is less than [H3O+]
    E) In neutral solutions, [H3O+] = [H2O].

    ****I put B as an answer...

    2) An acid and base react to forn a salt and water in a:thumbdown: _______ reaction.

    A) Dissociation
    B) Ionization
    C) Oxidation
    D) Reduction
    E) Neutralization

    **** I put E as an answer...

    3)The function of a buffer is to

    A) Maintain a neutral pH
    B) act as a strong accid
    C) change color at the end point of a titration
    D) be a strong base
    E) maintain the pH of a solution

    *****My answer is E

    3) A 10.0 mL of 0.121 M H2SO4 is neutralized by 17.1 mL of KOH solution. the molarity of the KOH solution is

    A) 0.207 M
    B) 0.142 M
    C) 0.428 M
    D) 0.4141 M
    E) 0.0708 M

    **** I used the M1V1=M2V2 and got the answer E.

    4) Identify each of the following compounds as an acid, base, or neither

    A) CO3 2- -----i put neither
    B) CN- ----- i put neither
     
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  3. Lonely Sol

    Lonely Sol cowgoesmoo fan! 10+ Year Member

    684
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    Dec 13, 2005
    Atlanta, GA
    For this one, you can't use M1V1=M2V2, since its an acid base rxn, normalty matter!

    SO, it would be (10ml*2*.121)/17.1mL ~.14 = B

    All the other one seems right, but not sure about the last one!
     
  4. ATLATLATL

    ATLATLATL 2+ Year Member

    113
    0
    Jan 9, 2007
    CN is a base whether it's a weak or strong base...sorry can't remember...
     
  5. doc toothache

    doc toothache 10+ Year Member

    7,888
    2,052
    Jan 17, 2006
    see www.science.uwaterloo.ca/~cch...123/salts.html
     

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