Spot the errors

[Anonymous]

I was just browsing randomly Tullock's book on water chemistry and found this titration curve:



Can anyone spot the error(s)?
:mrgreen:

 

[blackcloudmedia]

lol delinces. You wouldn't believe the horrible grammar that business majors have. It's almost depressing grading homework at my local college. "Account Recievables is off caus theirs balance werent recoreded properly date."

 

[Anonymous]

I sure would like to know how, exactly, the drops of acid correspond with the drop in pH. But, perhaps that's just me.

 

[Anonymous]

Dropping acid should be the label on the horizontal axis.

pH should be the label on the vertical axis. (The pH of seawater is about 8.5 before you start titrating the acid into it).

The word "Alkalinity" should be replaced by "Acid".

(Also, carbonate buffers best around pH 10.5, and is actually a fairly bad buffer around 8.5, so the data look fake.)

 

[Anonymous]

I sure would like to know how, exactly, the drops of acid correspond with the drop in pH. But, perhaps that's just me.

Lower pH == more acidic

 

[Len]

Drops of acid made me lol by itself, whatever axis it's on 8)

 

[blackcloudmedia]

wow I can't believe I didn't catch the incorrectly assigned axis. Slaps face. Was there any subtext to the expirement? Like was the acid added to a beaker of seawater or was it added to a tank of calcerous rock. Also what milliliters and fl oz.

 

[Anonymous]

I don't think it is an experiment, just an illustration of how buffering works in a marine system. But if he (or his proof-readers) understood it, they would have immediately caught that. It is basically high-school chemistry.

 

[Anonymous]

I agree, it looks like they are just mislabeled.

 

[Anonymous]

I don't think it is an experiment, just an illustration of how buffering works in a marine system. But if he (or his proof-readers) understood it, they would have immediately caught that. It is basically high-school chemistry.

Jesus, then how on earth did I get out of my HS chem class with a high B? :shock: :lol: I knew something looked screwy!

I couldn't read the text, though.

 

[livingstone]

Ummm. Dropping acid tends to make you miss things...

:wink:

My apologies,

 

[Anonymous]

:lol: We TOTALLY need a drum smilie (rim shot).

There are those who might blame it on something else. :shock: :lol:

 

[Anonymous]

:roll: I'm surprised anyone passes high school chemistry :lol: when dropping acid is involved.

 

[Anonymous]

<raise hand>
<stand up>
The titration curve is also not very good. There should be more sampling points around the equilibrium/equivalence point to give it the characteristic S-curve associate with the titration of a weak acid with a weak base.
<sit down with a smile>

 

[Anonymous]

Ummm. Dropping acid tends to make you miss things...

Quite the opposite.

 

[Anonymous]

<raise hand>
<stand up>
The titration curve is also not very good. There should be more sampling points around the equilibrium/equivalence point to give it the characteristic S-curve associate with the titration of a weak acid with a weak base.
<sit down with a smile>

How do we know it was a weak acid?

 

[Anonymous]

I don't know. If the acid is strong, the curve will be very, very sharp, almost like a Z. But if it is a weak acid, it will have rounded "corners" shape like the integral sign in calculus. My chemistry is rusty, so let me know if I need to take out my books.