Unit 6: Acid-Base Applications Lesson 3: Standards and Titration Curves

Standard Solutions Titrations require a solution with accurately known concentration – called a standard solution. Ways to make a standard solution: Dilute a measured amount of a pure, stable (unreactive with chemicals in the air) substance to a precise volume. This is called a primary standard. Titrate a solution with a primary standard to accurately determine its concentration. 10 min

Common Primary Standards The following are most commonly used to prepare primary standards: Potassium hydrogen phthalate (acid) b) Oxalic acid dihydrate (acid) c) Sodium carbonate (base)

Brain Break! Find as many words as you can using the letters shown, always using the middle letter. What’s the 9-letter word? publisher

Plotting a Titration Curve Complete #124 on pg. 167 15 min

Titration Curve for a Strong Acid and Strong Base The pH rises almost vertically near the equivalence point. Since a strong acid and a strong base undergo neutralization, the equivalence point is neutral. Thus, an indicator with a transition point near pH=7 is needed. 10 min

Homework Pg. 165 #121 and 122