Today we discussed how to interpret titration curves...telling what was being titrated (SA/WA/SB/WB), what combination of S/W analyte & titrant were being used (based on pH at the equivalence point), buffers and how to calculate the pH of a buffer solution (see the online practice at http://www.sciencegeek.net/Activities/Buffers-Composition.html ) We also described the half-equivalence method for determining the pKa of a weak acid.
Unit 12 Test is tomorrow. Check the blog for assignment to be completed for Thursday.
Today we discussed indicators and titrations. After solving several titration calculations together, we used an online titration simulation to demonstrate identification of the endpoint of a strong acid/strong base titration using phenolphthalein indicator by the faint pink color. This and other titrations can be performed using the simulation linked here.
The following links can also provide good orientation/practice when it comes to titrations:
Narrated & Interactive Titration Tutorial
Royal Society of Chemistry Interactive Lab Primer - Titration
On Monday, we will complete a titration lab and examine the titration curves of SA/SB, SA/WB, WA/SB & WA/WB titrations. In preparation for this lab, please find chemical/safety data for the following solutions: hydrochloric acid, sodium hydroxide, acetic acid, ammonium hydroxide, phenolphthalein & methyl orange