Chemical Changes Lab
Report Submitted: June 12, 2013
Title: Observations of Chemical Changes
Purpose: The purpose of this experiment is to predict and examine chemical changes/reactions among common chemicals found in consumer products at a macroscopic level.
Procedure: The procedure of this experiment was to carefully mix different chemicals together using the chemical filled pipettes and the 96-well plate and determining what chemical reactions occurred.
Data Table: Observations of Chemical Changes Experiment 1: Observations of Chemical Reactions | Well #/Question: | Chemicals: | Reaction: | A-1/A | NaHCO3 andHCL - CO2 | Substance bubbled, releasing Carbon Dioxide | A-2/B | HCl andBromthymol Blue | Substance turned a yellowish-orange color | …show more content…
| A-6/F | Kl and Pb(NO3)2 | Substance turned a yellow color and became very cloudy | A-7/G | NaOH andPhenolphthalein | Substance turned a dark pink color | A-8/H | HCl andPhenolphthalein | Substance unexpectedly remained clear | A-9/I | NaOH and AgNO3 | Substance became extremely cloudy and turned a brown color | A-10/J | AgNO3 and NH3 | Substance, after exposure to light, turned a dark brown color | A-11/K | NH3 and CuSO4 | Substance turned a cloudy light blue color | …show more content…
One way to test a material for the presence of sodium bicarbonate is to take a sample and add HCl (Hydrochloric Acid) and see if a chemical reaction (bubbling, releasing Carbon Dioxide) occurs. If this chemical reaction does occur, then the material does in fact contain Sodium Bicarbonate. B. All Purpose Cleaner with Bleach – the reaction remained blue from the Bromthymol Blue, and then turned clear again after about a minute. Windex Window Cleaner – the reaction remained a dark blue color. Bleach – the Bromthymol Blue chemical remained at the top of the bleach, not mixing, then after a minute turned clear again. From my observation, most household chemicals are bases, since the Bromthymol Blue mixed well into the substances. C. If the sample turned pink in color then I would make the assumption that the substance isn’t vinegar. I make this assumption because phenolphthalein turns pink when added to a base, not an acid. And since vinegar isn’t a base, the mixed substance should have remained clear instead of turning pink. Therefore, I do believe the substance is not vinegar. D. From this test, I can assume that most flavors of Vitamin Water seem to be pH neutral, with the occasional flavors that probably have certain additive flavors that make the drink change in acid/base
Title: Observations of Chemical Changes
Purpose: The purpose of this experiment is to predict and examine chemical changes/reactions among common chemicals found in consumer products at a macroscopic level.
Procedure: The procedure of this experiment was to carefully mix different chemicals together using the chemical filled pipettes and the 96-well plate and determining what chemical reactions occurred.
Data Table: Observations of Chemical Changes Experiment 1: Observations of Chemical Reactions | Well #/Question: | Chemicals: | Reaction: | A-1/A | NaHCO3 andHCL - CO2 | Substance bubbled, releasing Carbon Dioxide | A-2/B | HCl andBromthymol Blue | Substance turned a yellowish-orange color | …show more content…
| A-6/F | Kl and Pb(NO3)2 | Substance turned a yellow color and became very cloudy | A-7/G | NaOH andPhenolphthalein | Substance turned a dark pink color | A-8/H | HCl andPhenolphthalein | Substance unexpectedly remained clear | A-9/I | NaOH and AgNO3 | Substance became extremely cloudy and turned a brown color | A-10/J | AgNO3 and NH3 | Substance, after exposure to light, turned a dark brown color | A-11/K | NH3 and CuSO4 | Substance turned a cloudy light blue color | …show more content…
One way to test a material for the presence of sodium bicarbonate is to take a sample and add HCl (Hydrochloric Acid) and see if a chemical reaction (bubbling, releasing Carbon Dioxide) occurs. If this chemical reaction does occur, then the material does in fact contain Sodium Bicarbonate. B. All Purpose Cleaner with Bleach – the reaction remained blue from the Bromthymol Blue, and then turned clear again after about a minute. Windex Window Cleaner – the reaction remained a dark blue color. Bleach – the Bromthymol Blue chemical remained at the top of the bleach, not mixing, then after a minute turned clear again. From my observation, most household chemicals are bases, since the Bromthymol Blue mixed well into the substances. C. If the sample turned pink in color then I would make the assumption that the substance isn’t vinegar. I make this assumption because phenolphthalein turns pink when added to a base, not an acid. And since vinegar isn’t a base, the mixed substance should have remained clear instead of turning pink. Therefore, I do believe the substance is not vinegar. D. From this test, I can assume that most flavors of Vitamin Water seem to be pH neutral, with the occasional flavors that probably have certain additive flavors that make the drink change in acid/base