#stoichometry

[kiranirvanna]

I don't suppose I'm being followed by any chemistry buffs...?

If so and you happen to see this, I've got a project for chemistry lab going on right now and it involves "Diacids" I've looked that term up but I'm getting nothing except "diprotic acids" and "dicarboxylic acids" which doesn't help much. I did google "Is tartaric acid a diprotic acid" and it apparently IS. Which just makes me completely uncertain about whether we completely screwed this whole thing up..

Short and long of the project is we were supposed to use titration to find the equivalence points for white and red wine samples with the goal of determining the amount in grams per hundred milliliters of Tartaric Acid in the two wine solutions. I have some idea of how this is done. We did the titrations, though I'm not sure we went far enough with it given that diprotic acids have TWO equivalence points, so if THAT is what it was talking about we're SOL cause we only got one. However, we did titrate a LOT of NaOH into the wine, so idk, maybe there are two EQ points there, which which case I have no idea what I'm supposed to do. Also there are other acids in wine from what we were told, so I'm not sure how to account for that, or even if we're supposed to.

To further clarify what I HAVE done so far, I took the amount of .0989 M NaOH at the equivalence points for all the titrations, and multiplied that by the Molarity to find the number of moles of NaOH used (The red averaged 17.15 mL NaOH to achieve EQ and the white required 17 mL.) Then used the balanced equation to aquire the mole ration between the two to find the number of moles of C4H6O6 (Tartaric Acid). Then I used the molecular weight to find the grams C4H6O6 in the 20 mL samples we titrated. Finally I did the math to calculate the amount of grams there would be in a 100 mL sample.

I feel like I'm probably doing everything wrong ever x.x halp!

[radioactivepigeons]

I know that we take classes for a reason... because we need to learn things. But, most classes come with pre-requistes. Its hard to do calculus if you don't know what a function is. Similarly, you can't read Marquez or Cervantes if you don't know the meaning of words like "familia" or the phrase, "¿Dondé está el bano?". You're not going to analyze Shakespeare if you can barely read english. So, as an instructor in an upper level chemistry course, I expect that my students have basic chemistry skills. I got an email this afternoon asking me about basic stoichometry. Question 1 without total guidance.