Concentration

Concentration of Copper Bromide

I. Introduction

a. This lab was taken place in order for us to figure out the concentration of Copper (II) Bromide solution through letting it interact with different masses of Aluminum and the use of chemistry calculation methods, stoichiometry. The final products of this experiment would contain excess and limiting reagents in it.

Research Question:

What is the concentration of Copper (II) Bromide?

Hypothesis:

The different masses of the Aluminum and chemical reaction from the Copper (II) Bromide solution will leave one limiting and the other reagent unless the situation is ideal. There can only be one ideal situation and the other will have too much or too little of something.

b. Dependent Variable:

The amount of Aluminum reacted with the solution of Copper (II) Bromide

c. Independent Variable:

The amount of Copper (II) Bromide

d. Control Variables:

* The amount of Copper Bromide in each beaker because they all have 50.0 mL

* Hot plate level 2

e. Equipment

* 100.0mL graduated cylinder

* 250.00mL beakers

* Glass stirring rod

* Analytical electric balance (go to 0.00001)

* Hot plate

* Stop watch

* Goggles

* Copper Bromide solution

* Aluminum

2. Method

i. First we gathered all of our equipment and were ready to experiment.

ii. Next, we measured the amount of 50.0mL into each of the four beakers using the graduated cylinder.

iii. Then we measured 4 different masses of the aluminum foil. (0.1130g, 0.0900g, 0.0730g, 0.1320g)

iv. Then we put the aluminum into the beakers of solution, stir, and waited for the reaction.

v. The reaction took longer than we expected so we used a hot plate to speed up the chemical process.

vi. We took notes as we watched the reaction occur.

vii. After we were done with the reaction and got our data, we poured the leftover solution into a waste beaker and cleaned up our area.

viii. We then all...