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 unknown 4. Calculate Normality of unknown 5. Determine Molarity of unknown

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

Titration Practical Quiz Take appropriate minibeaker Note: pH will be between 1-3 Solution you will need: 0.05M NaOH Think about how to mix this accurately What you are allowed: notes/procedure/data from yesterday that’s all !! Turn In Description/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 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 – Questions: P 570, q 18,20,22,23,24,25