Teacher Portal
Acids and Bases
Investigation 2
Investigation 2
Acids and Bases
Phase 1 – Defined Understanding
Access Student Guide
Download and Distribute
Access Teacher Guide
Student Guide with Answers
Teacher PreLab
Prepare for the Experiment
Phase 2 – Dynamic Understanding
Phase 2 – Dynamic Understanding
► Investigation Two Summary – Lab Goals
In Investigation Two, you diluted a solution of hydrochloric acid (HCl) using a technique called serial dilution and then determined the pH of the different dilutions. During this Investigation, you:
1. Prepared six (6) falcon tubes to perform a technique called serial dilution to dilute an acid five (5) times.
2. Determined the hydrogen ion concentration of each solution by measuring its pH.
► Investigation Two Summary – Learning Goals
Through these experiments, you concluded that:
- As the pH of a solution increases, the concentration of H+ ions decreases. As the concentration is decreased 10 times, the pH is increased by 1 pH unit. As the concentration is increased 10 times, the pH is decreased by 1 pH unit.
2. The concentration of hydrogen ions (H+) can be changed by diluting a solution by adding more solvent.
Launch Concept Slides/Annotations
Mathematics Concepts in This Investigation
- (in)direct relationships
- parts/whole
- division
- mass in grams
- volume in mL
- sequences
- data table
- continuum scale
- counting whole numbers
- decimals to nearest tenth to hundred thousandths
- line graph
- patterns/trends
- greater than/less than/equal to
- logarithmic scale