Chemicals Properties

Abstract: During this experiment, I had the opportunity to examine the reactions of some common chemicals placed in mixtures and the changes the chemical will undergo. The goal of this lab is to investigate the chemical changes when two different substances are made into a mixture. During this experiment, there was the opportunity for me to observe different chemical reactions and determine the properties of the mixture. There were several results that changed colors and formed a precipitate and bubbled up. Then on the other hand there were mixtures that no chemical changes were observed or could be detected at all.

Purpose: To observe the macroscopic changes that occur in chemical reactions and attempt to interpret the microscopic changes of the atoms and molecules that allow for the macroscopic changes to happen; also, it is to learn the importance of how to separate mixtures.

Procedure: For the following combinations of chemicals, and using a different well of the 96-well plate for each combination, I must place 2 pipet drops of the first chemical in one well and then add 2 drops of the second chemical, unless it is stated otherwise below. After combining the chemicals, I must observe the mixture against white and dark backgrounds by slipping white and black paper underneath the well plate. For ever reaction, I wrote down the chemical combination, the well number, and my observations of the chemical reactions against the white and dark backgrounds. The combinations are as follows:

• NaHCO3 (sodium bicarbonate-baking soda) and HCl (hydrochloric acid)

• HCl and BTB (Bromthymol blue)

• NH3 (ammonia, a base) and 1 drop of BTB

• HCl and Blue Dye

• Blue Dye and NaOCl (sodium hypochlorite). Observe, then add 1drop of HCl.

• NaOCl