Hydrate Lab

Many ionic compounds, when crystallized from water solution, take up definite proportions of water as an integral part of their crystal structures.  This water of crystallization may be driven off by the application of heat.  The number of moles of water of crystallization driven off per mole of the anhydrous compound is a simple, whole number.  If the formula of the anhydrous compound is known, you can then determine the formula of the hydrate. 

In simpler terms, we dehydrated a hydrate and created an anhydrate which was essentially a compound with the H2O taken out of it. We were able to calculate the moles of water(n) in the hydrate.

Here

Hydrate Lesson

This lesson was probably the biggest doozie of the year. It wasn't impossible but very hard to follow. It is making me nervous for this lab! I will have to review this weekend. Here is a helpful link!

Hydrate Help

http://www.webassign.net/labsgraceperiod/tccgenchem1l1/lab_3/manual.html

Chemical Composition Pre-Test

So this is what I expected the pre-test to be like.. I heard the next unit is incredibly hard and the pre test says it all. I would be lucky to get 5 of those right off of guessing... Looks like this unit it about to be a grind. 

http://tedlillyfanclub.blogspot.com/2012/04/sad-baby-face-sad-baby-face-baby.html

Last Meal Project

Our project for this unit was the last meal project. It was pretty simple, all we needed to do was convert recipes from customary to metric. We then had a party to celebrate all of our hard work! Here is a photo of a sample of my work.

Here was a link that was incredibly useful when converting: Metric Kitchen

Measurement Unit Test

The test wasn't entirely hard but it was tricky. While I was working the worry of: am I doing this right continuously ran through my mind. I'm hoping for the best though! #sigfigs

http://sarahandthegoonsquad.com/wp-content/uploads/2009/09/worries_worried_face-300x300.png

Sig Figs

The sig fig lesson was almost a refresher. I learned them at some point in my schooling career but forgot it all from years of not using it. Sig figs in general would probably piss of any math teacher in this school because it defies every rule we have learned in math. It is confusingly simple. If you need a refresher here is a link! 

Sig Fig Refresher

Asprin Experiment

Aspirin Lab

The last two days I have been creating Aspirin in the lab. Aspirin is a synthetic organic derived from salicylic acid. In the experiment acetic anhydride is added to a measured mass of saliylic acid in the presence of a catalyst (sulfuric acid). The mixture is heated to form acetylsalicylic acid and acetic acid. After cold water is added to destroy the excess acetic anyhydride and cause the product to crystallize. Below are some photos from our experiment! 

 Day 1: Heating the mixture of salicylic acid and acetic anhydride.

Day 2: Filtering out the crystals from day 1.

Day 2: Photo of our product in the Buchner Funnel being dried out.