Titration Lab Practice and Calculations

Evaluation/Assessment: Objective: Today I will be able to: Use correct lab technique to titrate an acid Calculate the concentration of an unknown acid using titration Evaluation/Assessment: Informal assessment: Monitoring student performance as they complete the titration lab and calculations Formal assessment: analyzing students titration lab calculations and exit ticket Common Core Connection Value Evidence Use appropriate tools strategically Attend to precision

Lesson Sequence Evaluate: Warm – Up Engage and Explore: Titration Lab Practice Explain: Titration Calculations Elaborate: Titration Lab Practice with Calculations Evaluate: Exit Ticket

Warm - Up What does it mean to be a conjugate base? Predict the products and identify the acid, base, conjugate acid, and conjugate base: HSO4-(aq) + CO32-(aq)  SO42-(aq) + HCO3-(aq)

Objective Today I will be able to: Use correct lab technique to titrate an acid Calculate the concentration of an unknown acid using titration

Homework Tonight’s HW: Conjugate Acid Base WS

Agenda Warm – Up Conjugate Acids & Bases Titration Lab Practice Titration Lab Practice with Calculations Exit Ticket

Titration Lab Technique

Titration Lab Technique Work in the lab with a partner At most you have 3 trials to complete You pick your best one! Must wear goggles, aprons and closed toe shoes Take 5 ml of HCl Titrate it with NaOH Show Mr. Klotz your titrated sample EVERY sample even if you want to do more Dispose of titrated HCl/ NaOH in the sink with excess water Do not refill the buret. Call Mr. Klotz over if you need more NaOH Pass out worksheets and have them cross out the backside

REMEMBER! This is what your solution should look like

Titration Lab with Calculations

Titration Lab with Calculations Use the the technique you practiced yesterday Record the data for the quantity of NaOH used and the concentration to help you determine the unknown concentraton of HCl Calculate your percent error Repeat if you got a high % error or you over titrate

Exit Ticket Reflection: What will I do to be successful in the titration lab practical next class?