The pH indicator, phenolphthalein, turned a light shade of pink when it was in a solution with a pH of 7. Neutralization reactions occur when an acid is mixed with a base. The product of this reaction is a salt and water. These reactions are double displacement reactions, because the cation of the base mixes with the anion from the acid, forming a base, and the hydrogen from the acid mixes with the anion from the base, forming water. In this reaction, the sodium ion from the sodium hydroxide attracts to the acetate ion from the acetic acid, and the extra hydride ion bonds with the negative hydroxide ion to form water. The water produced by the reaction had a pH of seven, and so when the whole solution was light pink, we knew the reaction had fully…
solution and will stain skin and clothing. Avoid contact of all chemicals with skin and eyes.…
1. Write a balanced equation for each reaction observed in this lab. (10 points total, 2 points each)…
After completing this experiment several of the chemicals just simply changed colors. The main colors shown were blue, yellow, pink, green, and a brownish black. A few of the reactants did not change to a different color at all, but did show little signs of bubbles at the surface.…
The experiment performed in the first part of this lab was to mix various chemical solutions together and then observe and record the chemical changes, also if a chemical change occurred at all. This was very interesting to me since some of the chemicals I thought were going to react didn’t, while some I thought were going to have no change suddenly changed color or texture.…
Purpose: To observe some properties of chemical reactions and to associate chemical properties with household products.…
chemical were placed in a well along with two drops of another chemical. Chemical reactions and color…
Objectives: 1. To examine a variety of reactions including precipitation, acid-base, gas forming, and oxidation-reduction reactions. 2. To identify the products formed in these reactions and summarize the chemical changes in terms of balanced chemical equations and net ionic equations. 3. To identify the species being oxidized and reduced in oxidation-reduction reactions and determine which species is the oxidizing agent and the reducing agent. Chemical equations represent what occurs in a chemical reaction. For example, the equation HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) describes an acid-base reaction, a type of exchange reaction in which the driving force is the formation of water. In an exchange reaction, the…
H.|NaOH + phenolphthalein|A9|The NaOH was clear, but as soon as it was dropped into the well it turned a very light pink and after mixing it with phenolphthalein it turned into a strong sort of fuchsia pink. It looks about the same under black and white paper. |…
Please note that this procedure was adapted from the “Observation of Chemical and Physical Changes” LabPaq Lab manual (Hands-On Labs Version 42-01-82-00-03, 2015)…
4. I will use goggles and cloves all the time, I also need to point dangerous materials away from other people and I should be specially cautious with hydrochloric acid.…
1. How did your proposed procedures or flow charts at the beginning of this experiment compare to the actual procedures of this lab exercise?…
Objectives Observe and classify several chemical and physical changes. Give evidence for the occurrence of a chemical reaction. Write a balanced equation for a chemical reaction. Identify a reaction as a combination, decomposition, replacement, or combustion reaction. Background Physical properties can be observed without changing the chemical composition of the substance. Common physical properties that can be measured without changing the chemical composition are melting point, boiling point, solubility and density. Taste and odor are usually considered to be physical properties although they depend on the physiology of the person making the observations. Physical changes do not cause a change…
In a 50-mL beaker, 2-3 drops of phenolphthalein indicator was added to 9 mL of 0.1 M HCl. Then, 10 mL of 0.1 M NaOH was added drop wise with a pipet to the beaker of phenolphthalein and HCl. Observations about the color of the solution at each step was especially noted.…
The experiment is to observe a variety of chemical reactions and to identify patterns in the observation of reactants into products. The properties of the reactions will be analyzed to classify the chemical reactions into different groups.…
