Questions on Gen Chemistry... Please help

[elaine07]

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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👎 _______ 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

 

[Lonely Sol]

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.

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!

 

[ATLATLATL]

CN is a base whether it's a weak or strong base...sorry can't remember...

 

[doc toothache]

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.



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

A) CO3 2- -----i put neither
B) CN- ----- i put neither

see www.science.uwaterloo.ca/~cch...123/salts.html