pH Measurement and Buffer Prep

​GROUPINGS

ASSIGN:
1. LEADER
2. SECRETARY
3. TREASURER
4. RESEARCHER
5. TECHNICAL MASTER

​GROUPINGS

Multiple Choice

1. A solution has a pH of 9. What can be inferred about thenature of this solution?

• The solution is neutral.
• The solution is a strong acid.
• The solution is acidic.
• The solution is basic.

Multiple Choice

2. A solution has a pH of 4.5. What does this pH valueindicate about the solution?

• The solution is acidic.
• The solution is alkaline.
• The solution is basic.
• The solution is neutral.

Multiple Choice

What does the pH value represent in an aqueous solution?

• The concentration of hydroxide ions (OH-)

• The concentration of hydrogen ions (H+)

• The concentration of oxygen ions (O2-)

• A)The concentration of sodium ions (Na+)

Multiple Choice

What  does  the  term  "pOH"  represent  in  a solution?

• The concentration of hydroxide ions (OH-)

• The concentration of hydrogen ions (H+)

• The concentration of oxygen ions (O2-)

• A)The concentration of sodium ions (Na+)

Multiple Choice

According  to  the  definition,  how  are  acids  and  bases distinguished  based  on  their  behavior  in  aqueous solutions?

• Acids decrease H+ concentration; bases decrease OH- concentration.
• Acids and bases do not affect H+ or OH- concentrations in solutions.
• Acids increase OH- concentration; bases decrease H+ concentration.
• Acids increase H+ concentration; bases increase OH- concentration in aqueous solutions.

Multiple Choice

In the given rationale of conjugate base-acid pairing, why is HCl considered an acid?

• HCl is an acid because it donates protons (H+) in solution.
• HCl is an acid because it has a high pH.
• HCl is an acid due to its strong ionic bonds.
• HCl is an acid because it absorbs protons in solution.

Multiple Choice

According to the rationale, what is the conjugatedbase of HCl?

• HClO
• Cl2
• H2Cl
• Cl-

Fill in the Blank

Compute for the pH of solution with [H+] = 2.3 × 10 -5 M

.

Open Ended

What is the H+ concentration of a solution of a solution with a pH of 5.4

Open Ended

What is the pOH value of a solution with a pH of 8.4

Open Ended

How about the OH- concentration?

​What They Do

• Main function: Neutralize acids from food, drinks, or bacterial metabolism (especially after eating carbohydrates).

• Why important: Acids lower the mouth’s pH, which can lead to demineralization of enamel and cavities if the pH stays low for too long.

• Target pH range: Around 6.8–7.4 (near neutral), which is optimal for oral health.