Fruit Juice Lab Continued

Well, today we finished the fruit juice lab. There was nothing new really, just finishing up the second trials for all the samples and standard. That's it.

Fruit Juice Lab

Today we began a lab involving the concentration of vitamin c in various fruit juices. It was interesting seeing the color changes, as well as the vast difference between the amount of iodine needed to cause the change.
 Here's a picture of the samples before titration:

And here's an example of after:

Hydrogen Peroxide Lab

Today we had a work day, but the lab we were working on seemed interesting. It had a slight amount of stoichiometry, which worried me at first. However, I was very pleased when I came up a reasonable answer, so I was likely correct with my calculations. Or I may have just been so far off with the stoich and also so far off with my other calculations that they balanced each other out.

Murder Mystery Lab

Yesterday we began a lab which we concluded today. I personally found it quite interesting. We were given a list of suspects, with descriptions/circumstances etc. We were given two known solutions, as well as one unknown solution, the murder weapon. Although we concluded the lab today, there is still work to be done in order to find the murderer. While I know the weapon, there is still the molarity, which is needed to find which of the remaining suspects is the murderer.

Dilution

So, on friday we did a lab about dilution, in which we combined a set amount of water and progressively more and more diluted red food dye

It was an interesting way to visualize the change at a constant rate

Here is a calculator for concentration/dilution, which also has some links to other helpful calculators.

Lab/Exam

So, the other day, I guess yesterday, we got our copper dried off, and it looked more like I would expect copper to look.

I don't know why, but it was cool to think that this came exclusively from the liquid the nail was submerged in, and the missing bit of the nail became part of the liquid it was sitting in. I'm a bit of a nerd, not because I'm smart (which I'm not) but because of the stuff I think is cool. I wonder if there are any two gasses you could mix together to make a solid... I'm sure it's possible, but I don't have the drive to figure out which ones at the moment. Hydrogen and CO2? Idk, that probably wouldn't work with the reactivity series or something. Also, as a sidenote, we took our stoichiometry unit exam today. I was confident about stoichiometry, right up until I tried to do the first problem. I really need to get that fixed in my head. 

Stoichiometry Lab

So yesterday we started a stoichiometry lab , and today was the second day of it.

Here is the nail in the solution on the first day

And here's what appears to be some sort of sea sponge in a jar

I was surprised that so much copper precipitated (I think I've horribly misused that) in such a relatively short amount of time. I was also surprised sulfur ate so much iron off the nail by binding with it.