Separating Mixtures Lab 9/12/12

Separating Mixtures Lab

Due today: Beverage Density Lab, written procedure for Separating Mixtures Lab

Homework: Separating Mixtures Lab due friday, also test friday, and optional review sheet on moodle. 

Today at the beginning of class we got our 1.2 quizzes back. We did not go over any questions form the quiz, if you wish to do so you can meet with Mr. Lieberman outside of class. 

Next, we started working on the Separating Mixtures Lab. The goal of the lab is to seperate a mizture into it's components and determine the mass % of each component of the mixture. The mixture we used was made up of iron, salt, and sand. In your research you should have studied the properties of each component. 

iron: magnetic solid, insoluble in water

salt: non-magnetic solid, soluble in water

sand: non-magnetic solid, insoluble in water

From these properties, you should have been able to create a procedure determining the mass % of each component. This is the procedure my lab partner and I cam up with:

picture 1

picture 2

1. Using a scale, find the mass of the iron, sand, and salt mixture. The result for my mixture was 2.07 grams.
2. Obtain a magnet in a plastic bag and wrap a paper towel around the corner of the bag with the magnet in it. Slowly swipe the paper-towel covered magnet in circular motions over the mixture staying about 1-2cm above the mixture (picture 1).
3. Carefully remove the paper towel with iron on it from the magnet. Find the mass of the  iron by massing a small empty weigh boat on the scale, then pour the iron onto the weigh boat and mass. To find the mass of the iron subtract the mass of the weigh boat from the mass of the weigh boat with the iron in it. For mine, the mass of the iron was .46 grams.
4. Warm 25mL of water in a beaker on a hot plate.
5. Pour in sand and salt mixture and stir until salt is dissolved. 
6. Prepare filter paper by folding it into quarters and placing in a funnel. Place the funnel on a clay triangle on top of the beaker to suspend and hold the funnel in place (picture 2). 
7. Pour dissolved salt and sand mixture into filter. Collect salt water and pour sand back into beaker.
8. Place beaker with sand onto a hot plate and heat on the lowest setting. Heat until all residual water is evaporated (picture 3). 



picture 3

9. Mass an empty, small weigh boat. Pour sand onto weigh boat and mass. To find the mass of the salt subtract the mass of the empty weigh boat from the mass of the weigh boat with the sand (1.2-.52). The mass of the sand in my experiment was .68 grams.

That is it for the procedures done in class, the rest is all calculations. To find the mass of the salt, you need to add together the mass of the iron and sand (.46+.68=1.16.) then subtract that from the mass of the iron, salt, and sand mixture (2.07-1.16=.91 grams). 

That's all for today. This lab is due friday and don't forget we also have a test friday!!

NEXT SCRIBE: KATIE