Acids and Bases

Definitions

• Acid• Base• Conjugate Acid or Base• Neutralization Reaction• Normality

Titrations

• What’s important– The exact concentration of known solution– The exact volume of unknown solution– The exact endpoint

Titration Calculations

1. Calculate how many moles of titrant (known solution) added.

2. Check ratio of moles titrant : moles OH-3. Determine moles of unknown4. Calculate Normality of unknown5. Determine Molarity of unknown

Titration Calculations

Example: 15.60 ml of a 0.750M sodium hydroxide solution are required to bring 25.00 ml of a diprotic acid solution to its endpoint. 1) Determine Molarity of acid solution 2) Determine the pH of the solution

0117 .468. .234 .330

Titration Practical QuizTake appropriate minibeakerNote: pH will be between 1-3Solution you will need: 0.05M NaOH

Think about how to mix this accuratelyWhat you are allowed:

notes/procedure/data from yesterdaythat’s all !!

Turn InDescription/data/calculations/comparison

Acids and Bases the next step• Terms to define and relate to a weekend

without formal chemistry lessons;– Chemical Equilibrium– Dynamic Equilibrium– Law of Mass Action– Le Chantlier’s Principle

• Temperature, pressure, concentration

– Dissociation constant– Equilibrium constant– Strong Acid/base– Weak Acid/base– Ka, Kb

Weekend assignment

• Identify a dynamic equilibrium system influencing your existence.

• Identify three variables (conditions) that move or change the equilibrium you’ve identified.

• Be prepared to explain this to the class Monday.

Assignment for Tuesday• Read sections 17.1-17.3 from your text on

reaction rates and chemical equilibriums (equilibria)

• Research (Web) what happened in West, TX last Tuesday. Write a half page paper describing how conditions present at the fertilizer plant, or introduced to the fertilizer plant changed any reaction rates or equilibria during the evening hours there. Your grade (15 pts) will depend on your specificity and depth of information.

Factors that affect reaction rate

Factors that affect equilibrium

Calculations involving equilibria

• Section 17.6• Equilibrium Expression:

• Practice:– Read Section 17.617.7– Questions: P 570, q 18,20,22,23,24,25