Essay about Lab Observations of Chemical Changes

The experiment is to observe a variety of chemical reactions and to identify patterns in

Title: Using pHydrion paper to test the pH of vinegar, distilled water, laundry detergent, milk, NaOH, Mr. Clean, Baking Soda, Ammonia, 7up, Gatorade, and 4 unknown substances.

During the preparation of the, “Turning Pennies Green”, lab, students were asked to perform an experiment at home. The lab demonstrates what the effects of chemical and physical changes are. Students were asked go home, put two pennies in separate bowls, and label one bowl cup A, water and cup B, vinegar. Then, they were asked to place paper towels in the bowl. For cup A, water was to be poured in, but just enough to wet the paper towel inside, so the penny was not submerged.

In our third experiment, we observed and recorded different household chemicals and their reactions with chemical reagents. The purpose of this lab was to sharpen our powers of observations and deduce from observed reaction to identify household chemicals. The investigation allowed us to make comparisons of reactions and pattern recognitions. The four household chemicals used in the experiment are Lysol Toilet Bowl Cleaner, baking soda (Arm & Hammer), Vanish Crystal Bowl Cleaner, and Clorox Liquid Bleach. These chemicals were reacted with five reagents including blue food color, 0.1 M Silver nitrate, 0.1% thymol blue, 1.0 M Calcium chloride, and 6 M hydrochloric acid.

This experiment will discuss whether cream of tartar, laundry detergent, and vinegar are neutral, bases or acids contingent on changes in color. Neutral substances are chemicals that have no properties of either acids or bases, have equal parts hydrogen and hydronium ions and don't change the color of litmus paper or other acid-base indicators. A base is a chemical species that donates electrons or hydroxide ions or that accepts protons. Bases tend to change the color of acid-base indicators to blue. An acid is a chemical species that donates protons or hydrogen ions and/or accepts electrons. Acids tend to change the

Third lab: when I mixed the Sodium Hydroxide with water, the mixture change to the color pink. The result is a CHEMICAL CHANGE. Because you couldn’t change the pink color back to clear water before it was poured with Sodium Hydroxide. Fourth Lab: When I mixed the Baking Soda with Vinegar, it fizzes up to the top of the beaker. The result is a CHEMICAL CHANGE.

After reacting with H2O and becoming NaOH, Phenolphthalein is added and creates a pink colour indicating a base is

When doing the lab, I have found out that most of these chemicals combined was needed an acid base indicator. If you look at Figure 2.1 you can see that almost all the chemicals that we have tested were needed a drop of acid-base indicator to detect if it was acidic or basic. For chemicals KI and Pb(No3)2 ,when combined both substances quickly went together into a double displacement and turned into a gold color.

Start the experiment by taking 3 agar cubes containing pH-indicator dye phenolphthalein, and have the teacher cut three different cubes each with different measures; a cube measured 3cmx3cmx3cm, another 2cmx2cmx2cm, and another 1cmx1cmx1cm. (The agar cubes are acting as artificial cells for this experiment). Place each agar cube in the solution of vinegar and water, and start the stopwatch as soon as the cubes hit the water. Stop the stopwatch as soon as the smallest cube becomes fully clear and record how much time it took for the physical property to completely change. The agar cube is supposed to change color from pink to white, the phenolphthalein dye gives the agar cube the pink color. The purpose of this experiment is to test the relationship

#1. Experiment 1-1. Chlorine: The sodium hypochlorite solution that was initially used was yellowish in color. After mixing it with cyclohexane and hydrochloric acid, the color of the solution stayed the same, but the reaction released a yellow gas, presumably chlorine.

However much reagent needed to change the colour of the solution (thereby having a chemical reaction) is recorded ("Acid-Base Titrations - Chemwiki", 2013). Phenolphthalein is an example of an acid-base indicator, which are used to test the pH of a substance by changing the colour. This indicator weak and colourless, but when mixed with water it forms pink anions. The pH range of phenolphthalein is 8.2-10.0. Indicators are an important part of acid-base titrations as they are the main signal of a chemical reaction and completion of the test ("ACID_BASE INDICATORS", 2016).

In this Lab report we will be using Red Cabbage extract as an indicator to determine the pH of substances. The purpose of this experiment is to see if and how base and acids react. Indicators are chemicals that change color depending on the pH solution that they are dissolved in. This experiment will determine which items we use to determine ph. The pH of a solution indicates its acidity or alkalinity. There is a ph. scale that determines if the items such as lemons or bleach are an acid or a base. I have chosen to use red cabbage in this experiment so that I can know the range of the item that

Objective The objective of this lab is to determine the pH of common household items. Introduction This experiment involved determining if the liquids tested were acidic, a basic or neutral. An acid is a chemical substance that turns litmus paper red, neutralizes alkalis, and dissolves metals.

When testing the homemade pH paper the results of the experiment show the pH paper is more susceptible to acidic chemicals than to alkaline chemicals. For example, rubbing alcohol that has high alkalinity was not able to be sensed by the pH paper. Although, acidic chemicals such as vinegar and dish detergent are easily sensed by the pH paper.

(d) When pH paper was over ammonium carbonate, the paper turned dark blue even faster than the moist paper over household ammonia, indicating that it was a base.