1. Warm up 2-5-15 1. What is the molarity of a 500mL solution that contains 2.9 grams of hydrochloric acid, HCl? 2. What is the pH and pOH of that solution? 3. What is a neutralization reaction? 4. If you do use cabbage juice to test human blood, what color and pH do you expect it to be? Agenda -Turn in lab -Notes Unit 2 Titration -Online HW Homework Feb 6 - Online HW due before 9PM Feb 13 - Unit 2 online HW

2. Unit 2 Day 3 Titrations Key Concept: How much acids/bases are required to cancel each other out?

3. Neutralization Reactions A neutralization reaction between a strong acid and a strong base in aqueous solution produces an ionic compound (a salt) and water. Examples: 1. NaOH (aq) + HCl (aq)  2. KOH (s) + HNO 3 (aq) 

4. Check-in Sulfuric acid, H 2 SO 4 (aq), reacts with magnesium hydroxide, Mg(OH) 2 (aq). Write a balanced equation for the reaction that occurs. ________ + ________ +  ______+_______

5. Titrations Titration: a procedure in which a neutralization reaction is monitored with an indicator allowing you to calculate the unknown concentration of an acid or base. –Equivalence point: when the number of moles of [H + ] is equal to the number of moles of [OH - ] in the solution –Use the equation: (M= molarity, V= volume) M acid V acid = M base V base

6. Example If 25.0 mL of 0.500 M nitric acid, HNO3, solution is required to neutralize 62.0 mL of sodium hydroxide, NaOH, what is the molarity of the NaOH?

7. Check-in If 20.6 mL of 0.010M aqueous NaOH is required to titrate 30.0 mL of HCl (aq) to the equivalence point, what is the molarity of the HCl solution?

8. Assignments Summary Online HW Unit 1 due Friday Review worksheet due Tuesday