Observations of Chemical changes Essays

Submitted By sfcop2003
Words: 828
Pages: 4

Title: Observations of Chemical changes

Purpose: To observe the properties of chemical reactions and to associate chemical properties with household products.

Procedure: Utilized the well-plates to hold one chemical while pipetting a different chemical into the first chemical. After combining the two chemicals I visually observed how the two chemicals interacted with each other.

NaHCO3 (Sodium Bicarbonate) and HCL (Hydrochloric Acid)
The mixture immediately began to bubble and could hear an audible FIZZZ. The bubbles also rose to the top.
HCL and BTB (Bromothymol Blue)
Once added the BTB to the HCL the mixture turned orange.
NH3 (Ammonia, a base) and BTB
The mixture turned dark blue. I believe when you add a BTB base I would expect the color to turn blue. And when you add BTB to an acid I expect the color to turn Orange.
HCL and blue dye
When blue dye was added HCL it turned dark blue.
Blue dye and NaOCL (Sodium Hypochlorite) then HCL
When blue dye was added to NaOCL it turned blue. After adding HCL to the above mixture it turned green.
NaOCL and KI (Potassium Iodide)
Adding NaOCL and KI together to provide a yellow substance which appeared to be solid with a gel like affect to it.
KI and PB (NO3)2 (Lead Nitrate)
After KI was added to PB (NO3)2 I witnessed the mixture turn dark yellow.

NaOH (Sodium Hydroxide) and Phenolphthalein
This mixture turned white with a solidification which settled at the bottom of the well.
HCL and Phenolphthalein
This mixture stayed clear.
NNaOH and AgNO3 (Silver Nitrate)
Once the AgNO3 was added it turned brown with some type of solids forming at the bottom.
AgNO3 and NH3 (Ammonia)
This mixture stayed clear but could see small bubbles. Once placing the paper towel with the mixture on it under a light it took approximately an HR and I appeared the chemicals had separated.
NH3 and CuSO4 (Copper (II) Sulfate)
Cloudy blue color with over time a white bluish solid formed at the bottom.

A. If a household product label says it contains sodium hydrogen carbonate and I wanted to know if sodium bicarbonate was present. I would add HCL (Hydrochloric Acid) and see if it bubble and fizz to determine if sodium bicarbonate was present.
B. Windex and BTB turned Dark Blue, Dish Liquid and BTB turned dark yellow, Bleach and BTB also turned a dark blue. My conclusion is that the Windex and bleach are bases and the antibacterial dish liquid is an acid. My first thoughts was that the bleach and Windex would have been more of an acid in order to clean and disinfect better. I also thought the dish soap would have been more of a base in order not to damage your hands or dishware. With my conclusion it does makes sense because the bleach and Windex would have to be more of a base in order not to ruin your house hold items you are cleaning. While the dish soaps needs to be more acidic to deep clean the grease and food