Sodium Chloride Lab - Sept 17 Class

In the beginning of class, we reviewed Dimensional Analysis since we didn't get a chance to go over it thoroughly in the previous class. Here are some examples of unit conversions:


If you have trouble converting milligrams into kilograms, then you could always break it down into grams first. The 2 kilograms and the other 2 grams cancel each other out, leaving you with 120.000,000mg (120,000 x 1000).


This problem includes dealing with measurements and time as well. We must remember to incorporate both information. The Litres and the seconds each have another pair to cancel each other out, leaving you with 435 000mL/min (7.25 x 60 x 1000).


Once again we have broken down kg into g because it is easier to convert g into Mg. This problem also includes time that needs conversion as well. The kilograms, seconds, and grams all cancel out, and the end result is 626.4Mg/h (174 x 3600 x 1000/1,000,000).


After we did a little bit of review, we started our very first lab called Sodium Chloride.


















Purpose
To experiment the maximum amount of salt you can dissolve in 10mL, 20mL, 30mL, and 40mL.

Materials
- Sodium Chloride
- 150mL of Distilled Water
- 100mL graduate cylinder
- 50mL beaker
- 100mL beaker
- Weight paper
- Electronic Scale
- Lab coat
- Safety Glasses

Procedure
1. Gather all the materials an put them on the lab bench.
2. Measure 10mL of distilled water using the graduated cylinder. Transfer this water into a 50mL beaker.
3. Weigh 50 g of Sodium Chloride.
4. Add Sodium Chloride to the water until it stop dissolving and the first salt crystals begin appearing on the bottom of the beaker.
5. Measure the mass of salt remaining. Record the difference in salt as the amount added to the 10mL of water.
6. Repeat steps 2-5 for 20mL, 30mL, and 40mL of water.
7. Record all your data in the table below.
8. Create a graph of Mass of Salt vs Volume of Water.

Observations

The results can and may vary.





http://www.youtube.com/watch?v=Kxbc8nuv_0k

This video is similar to the lab we did today. The only differences were the scales, how they measured the ingredients, and they shook the salt and water together instead of stirring it with a glass rod.