CHEM 120 Week 4 Lab: Ideal Gas Law and Acids and Bases
Student Name
Chamberlain University
CHEM-120 Intro to General, Organic & Biological Chemistry
Prof. Name
Date
OL Lab 7: Ideal Gas Law
Learning Objectives
By the end of this laboratory session, you should be able to:
- Clearly explain the physical concepts of temperature and absolute zero.
- Describe and define the relationship between pressure, volume, and temperature in gases through gas thermometry.
- Apply the Ideal Gas Law to various situations.
- Identify examples of acids and bases that occur in everyday life.
- Define pH and use the pH scale to classify substances as acidic or basic.
- Apply the Brønsted–Lowry definition of acids and bases to chemical compounds.
- Explain the amphoteric properties and self-ionization ability of water.
- Calculate the pH of strong acids and bases in aqueous solutions.
- Predict whether a neutralization reaction will occur.
- Evaluate the outcome of basic acid–base reactions.
CHEM 120 Week 4 Lab: Ideal Gas Law and Acids and Bases
Introduction
The Ideal Gas Law is more than a theoretical concept—it can have real-world applications, including life-saving scenarios. In this lab simulation, learners explore the concept of temperature, absolute zero, and the interdependence of pressure, volume, and temperature through gas thermometry. The activity emphasizes how precise control of these variables can be essential in situations such as transporting organs for transplant, where environmental conditions must be tightly regulated.
Explore Your Workbench
The first stage involves familiarizing yourself with the equipment used for gas thermometry. Each piece of apparatus plays a critical role in measuring and maintaining pressure and temperature. Understanding the function of each instrument ensures accurate data collection and experimental success.
Experiment with Gas Thermometry
In this simulation, you will observe how the pressure of an ideal gas changes when cooled from the boiling point of water to the boiling point of liquid nitrogen. Because this is a virtual environment, time can be accelerated to quickly reach equilibrium. This flexibility also allows repeated trials using different gas quantities, ultimately enabling the determination of absolute zero temperature.
Application of the Ideal Gas Law
After collecting the necessary data, you will apply the Ideal Gas Law equation PV=nRTPV = nRT to calculate unknown variables. This step reinforces the theoretical concepts learned in gas thermometry and shows their practical significance in preserving medical supplies, particularly in high-stakes scenarios like organ transportation.
Reporting Back to Paramedics
Upon completion of the experiment, findings are reported to paramedics to ensure that the organ remains under optimal pressure and temperature until it reaches the hospital. This step highlights how scientific knowledge directly influences healthcare outcomes.
Acidic Life
An equally important component of this lab is understanding how acidic and alkaline substances impact our bodies, particularly the pH of blood. Working with a virtual lab assistant, you will test the pH of various solutions, including foods that may be alkaline yet contain acidic components. This section emphasizes that pH balance is crucial for maintaining homeostasis.
Salty Mixtures
Through mixing acids and bases of varying strengths, you will observe the resulting products, particularly salts formed during neutralization. The simulation allows mistakes to be easily corrected, encouraging experimentation and reinforcing learning through immediate feedback.
Corrosive Everyday Chemicals
Acids and bases are not just found in laboratories—they exist in household products, nature, and industrial processes. In this simulation, you will measure the acidity of common substances and evaluate their corrosive potential, reinforcing safe handling practices.
Part 1: Complete Labster Lab – Ideal Gas Law: Apply to Save a Life
1. Purpose
The aim of this experiment was to understand the Ideal Gas Law and its role in describing the relationship among volume, pressure, and temperature of gases. It also involved calculating absolute zero and learning how to use gas thermometry in practical, real-life scenarios.
2. Observations
| Observation Number | Description |
|---|---|
| I | Volume changes as the temperature of an ideal gas changes. |
| II | Pressure, volume, and temperature are directly related in gases. |
| III | Absolute zero remains constant regardless of changes in other variables. |
3. Question: If the pressure of a fixed volume of gas decreased in a sealed container, what variable would you think changed? Did this variable increase or decrease?
Answer: If the pressure decreases, the temperature also decreases.
4. Question: Why is it important to convert into units of Kelvin before using the Ideal Gas Law?
Answer: The Kelvin scale is essential for gas law calculations because it begins at absolute zero, eliminating the possibility of negative temperature values, which ensures accurate proportional relationships in calculations.
5. Question: Using what you learned in this simulation, explain why compressed gas cylinders, such as those found in the hospital, typically contain a warning to not leave in sunlight or expose to heat.
Answer: Exposure to heat increases the kinetic energy of gas molecules, which raises the internal pressure of the cylinder. Excessive pressure can cause the cylinder to rupture or explode, posing significant safety hazards.
Part 2: Complete the Labster Lab – Acids and Bases
1. Question: In your own words, describe how to determine which substance acts as an acid and which substance acts as a base in the forward direction of the following reaction: H₂S + H₂O ⇌ H₃O⁺ + HS⁻
Answer: The acid is the substance that donates a proton (H⁺), and the base is the substance that accepts it. In this reaction, H₂S donates a proton to H₂O, making H₂S the acid and H₂O the base. H₂O becomes H₃O⁺ after accepting the proton, while H₂S becomes HS⁻ after donating it.
2. Question: Predict the two products of the following neutralization reaction and label each product using acid/base terminology: HCl + RbOH → ?
Answer: The products are RbCl (a salt) and H₂O (water). In this reaction, HCl is the acid, and RbOH is the base.
3. Question: In your own words, describe the relationship between proton (H⁺) concentration, and pH.
Answer: pH is inversely related to proton concentration. When the concentration of H⁺ increases, the pH value decreases, indicating a more acidic solution. Conversely, lower H⁺ concentration corresponds to higher pH and greater basicity.
4. Reflection
From this simulation, I learned several key points:
- The Ideal Gas Law is applicable beyond academic contexts—it can directly impact real-world situations like organ transport in healthcare.
- Acid–base reactions are essential in both biological and industrial processes, influencing chemical production and physiological balance.
- Understanding pH is critical in healthcare, where maintaining blood pH between 7.35–7.45 is vital for patient health.
- Buffer systems, such as saline solutions, are indispensable for stabilizing pH levels in medical treatments, including IV fluids and insulin administration.
These concepts are directly relevant to a healthcare career, especially in nursing or clinical laboratory work. For instance, knowing how gases behave under different temperatures and pressures helps manage medical oxygen tanks safely. Similarly, understanding acid–base chemistry aids in preparing correct medication dosages and preventing harmful pH shifts in patients.
References
Atkins, P., & De Paula, J. (2018). Physical chemistry (11th ed.). Oxford University Press.
Zumdahl, S. S., & Zumdahl, S. A. (2020). Chemistry: An atoms first approach (3rd ed.). Cengage Learning.
CHEM 120 Week 4 Lab: Ideal Gas Law and Acids and Bases
Petrucci, R. H., Herring, F. G., Madura, J. D., & Bissonnette, C. (2017). General chemistry: Principles and modern applications (11th ed.). Pearson.