Formal report on complexometric EDTA titrationFull description
-Full description
Hello, this is Cams Ramirez from 2BPH batch 2018Full description
Experiment 3 ACIDS, BASES, AND SALTS
Group # 6 Signature Leader: Villaran, Roseann
__________________
Members: Tan, Marvin
__________________
Tiqui, Kevin Christian
__________________
Trinos, Searle Anne
__________________
Uri, Charmaine L.
__________________
Engr. Rosalina Corpuz Instructor
Objectives 1. to identify the properties of acids and bases 2. to know how acids and bases react with each other subtances
Theory •
The Arrhenius Theory of acids and bases o o
•
Acids are substances which produce hydrogen ions in solution. Bases are substances which produce hydroxide ions in solution.
The Bronsted-Lowry Theory of acids and bases o An acid is a proton (hydrogen ion) donor. o A base is a proton (hydrogen ion) acceptor.
•
The Lewis Theory of acids and bases o An acid is an electron pair acceptor. o A base is an electron pair donor.
Data and Results
PART I. Acids Acid
Red/Blue Litmus Paper
Hydrion Paper
Methyl Orange
Phenolphthalein
HCl
-blue to red -red to red
0
Light pink
Transparent/ Colorless
H2SO4
-blue to red -red to red
0
Dark pink
Transparent/ Colorless
Reaction with Zinc
HNO3
-blue to red -red to red
0
Light pink
Transparent/ Colorless
HC2H3O2
-blue to red -red to red
2
Dark pink
Transparent/ Colorless
H2C2O4
-blue to red -red to red
0
Dark pink
Transparent/ Colorless
PART II. Bases Base
Red/Blue Litmus Paper
Hydrion Paper
Methyl Orange
NaOH
-blue to blue -red to blue
14
Clear yellow
KOH
-blue to blue -red to blue
14
Yellow orange
NH4OH
-blue to blue -red to blue
11
Dark yellow orange
Ca(OH)2
-blue to blue -red to blue
8
Yellow orange
Ba(OH)2
-blue to blue -red to blue
14
Cloudy yellow orange
Reaction with Zinc
PART III. Salts 1. Pb(NO3)2 + HCl Observations: The resulted solution shows that some particles settle down at the bottom of the test tube.
Chemical Reaction: Pb(NO3)2 + 2 HCl
2 HNO3 + PbCl2
2. K2CrO4 + BaCl2 Observations: The solution become a milky-like solution after these two different solutions were mixed. Chemical Reaction: K2CrO4 + 2 BaCl2
BaCrO4 + 2 KCl
3a. NaCl + AgNO3 Observations: Some chalk-like particles settle down at the bottom of the test tube, while its liquid part became cloudy.
Chemical Reaction: NaCl + AgNo3
NaNO3 + AgCl
AgCl precipitates
3b. NaCl + AgNO3 + NH4OH Observations: In this reaction, a greater part of the chalk-like substance are contained in the resulted solution.
Chemical Reaction: NaNO3 + NH4OH
NH4NO3 + NaOH
NH4NO3 precipitates
3c. NaCl + AgNO3 + NH4OH + HNO3 Observations: The chalk-like subtance became stagnant at the bottom of the test tube.
Chemical Reaction: NaOH + HNO3
NaNO3 + H2O
Discussion of Results The table in Part I shows us the reaction of the given acids to the given medium to identify the property it contains. Table in Part II, like in the table of part I, lets us be able to identify the property bases have. Part III, on the other hand, enables us to identify what would happen if different salt solutions are mixed. It also shows us the chemical reaction that happens throughout the solution.
Questions: 1. Explain why some of the acids reacted faster with zinc moss than the rest.
2. Do salts form neutral solutions with water? Why or why not? No. Salts of weak acids will pull H off of water and leave a basic solution. Salts of weak bases will either accept hydroxide ions from or donate protons to water making acidic solutions. 3. summarize in outline form the ways of classifying acid, bases, and salts. I. Acids 1. It turns litmus paper from blue to red. 2. Through the use of hydrion paper, it helps determine the solution’s pH level. Solutions with a pH level of 0 - 6.9 are considered as acids. 3. The solution turns to pink when mixed with methyl orange. 4. There is no change in color when the solution is mixed with phenolphthalein. II. Bases 1. It turns litmus paper from red to blue. 2. Solutions with a pH level of 7.1 - 14 are consudered as bases. 3. The solution turns to yellow or orange when mixed with methyl orange. III. Salts
Conclusion Through the said experiment, we will now be able to identify the distinctive properties/ characteristics of acid and bases. Acid have the property that turns blue litmus paper to red and has the pH level of 0 – 6.9. While bases have the property that turns red litmus paper to blue and has the pH level of 7.1 – 14.
