chemistry- check!

1. A pure salt solution can be any of the following except
a. basic
b. buffered ***
c. alkaline
c. acidic

2. You can make a buffer with all the following except
a. weak acid + conjugate base
b. weak base + salt of weak base
c. strong acid + salt of strong acid *** you can't make a buffer when titrating a strong acid or strong base.
d. weak base + conjugate acid

3. Acidosis is a condition where the body fluids are too acidic. If someone with acidosis uses a lot of salt on their food,
a. the excess sodium ions will tend to raise the pH
b. the excess sodium ions will tend to lower the pH ***
c. the excess chloride will change the pH
d. it won't directly affect their pH

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  1. I agree with 1.
    I think c is your best answer for #2 but technically I don't like any of them. The part I don't like about the c answer is this. If I take a solution of 0.1 M HCl and titrate it with 0.1 M NaOH (or if I just add some NaOH to it), I get some NaCl produced. For the first few mL of NaOH added the pH changes relatively fast; however, for the next tens of mL , say the next 20 or 30 mL, you will have a buffered solution. That is, after the first few mL of the 0.1 M NaOH have been that strong HCl solution acts as much like a buffer as any normal buffer would.
    For #3,I'll pass. I know too little about acidosis but I looked on the net and found a number of articles discussing it so you check your answer there.

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  2. 2. could D also be the answer?

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  3. No. Buffers are made with an acid and its salt (which is a) or a base and its salt (which is d) so both a and d are legitimate ways to make a buffer. Answer c is the best answer there; I just wanted to point out strong acids/strong bases have stretches in their titration curves where they act as buffers. Look at the titration curve for a strong acid with a strong base (or the reverse) and see that there a long almost flat line between the beginning and the point about 1 mL or so before the curve starts bending to the end point where the pH hardly changes at all.
    I can't copy on this post but I will post just under this with a url to give you that curve for a strong acid vs strong base.

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