Search this site, all UNL or for a person

• UNL
• Arts & Sciences
• Department of Chemistry
• Resource Center
• Chem 110 Lab Connections

Department of Chemistry

Chem 110 Lab Connections

 

1. Microsoft Internet Explorer will open ".DOC" files inside the browser. Therefore, MSIE users should save .DOC files to your own computer, then open them with Microsoft Word.
2. Non-Microsoft browsers will probably open .DOC files using Word if Word is installed on your computer.
   ".DOC" files require Microsoft Word.
   ".PDF" files work similarly but require Adobe Acrobat Reader.
   
   
   
   

Week 1: Introduction

In this lab you will become familiar with the Lab Pro and calculators to determine the effects of intermolecular forces on boiling points.

Week 2: Seeking Solutions

Once we have a good understanding of the intermolecular forces within liquids and solids we can apply those concepts to the mixing of substances to make solutions. (like dissolves like) A key property of most solutions is how much solute is dissolved in a given solvent. In this experiment you will learn more about the molarity (moles dissolved per Litre of total solution) of a particular example - Barium hydroxide octahydrate. Use caution remember barium compounds are toxic.

Week 3: It's a Cold, Cold World, and Getting a Bit Colder!

In lab this week you will be investigating freezing point depression of solutions. Placing a solute in a solvent causes the freezing point to drop below normal. This is a key topic and will be based on molality (m).

Week 4: Entropy and Snack Food Calorimetry

In this lab you will obtain experimental values for entropy changes in chemical and physical changes. You will also be constructing a calorimeter to determine the enthalpy of the combustion of a peanut.

Week 5: Diamonds are Forever...Or are They?

In this weeks lab you will develop a mechanism that tells how the reaction produces the product. This mechanism can be determined by finding the rate law. You will use the concepts for acid-base reactions in understanding this lab.

Week 6: Bioavailability of Iron

In this lab you will use Beer's Law and the concepts behind dynamic equilibrium in order to determine the equilibrium constant from the reaction rates of a known system. You will also find the effects that acidity has on the solubility and absorption of iron in the body.

Week 7: It's Just a Gut Feeling

In this lab you will use titration with sodium hydroxide to determine the neutralization capacity of various antacids.

Week 8-10: Qualitative Analysis and Nine Potions

This week we begin a three week exploration that will emphasize your lab skills and analytical thinking. There will some direct connections to equilibrium and acid base chemistry from lecture. Qualitative Analysis involves using known chemical reactions to determine the unknown ion(s)present in solutions that you will be given. Pay particular attention to how equilibrium conditions can bring about the precipitation of certain colorful compounds. This can be used to identify the original unknown ions present in a solution.

Week 11: Irresistible? Buffers

In this experiment you will be making two sets of solutions. In one set you will be adding hydrochloric acid. In the other set you will add sodium hydroxide. By observing the changes in pH while adding the acid/base you will be able to see the ability of buffered and unbuffered solutions to resist changes in pH.

Week 12: Identifying and Unknown Diprotic Acid

In this lab you will be performing titrations to determine the Ka value of an unknown acid in order to identify the acid.

Week 13: Titration

In this lab you will perform titrations to find the percent sodium hypochlorite found in commercial bleach

Week 14: Electrochemistry

In this weeks lab you will determine the experimental voltages of electrochemical cells, the identity of an unknown metal, and the effect of varying concentration on the voltage in an electrochemical cell.

Week 15: CHECK-OUT

 

Back to top