CHEM 120 Lecture Notes - Lecture 1: Inflection Point, Equivalence Point, Magnetic Stirrer

• School: McGill University
• Department: Chemistry
• Course: CHEM 120
• Professor: Laura Pavelka

Document Summary

5: weigh 0. 18g of biphthalate into a clean and dry. 125ml erlenmeyer: add 50ml of distilled water and 4 drops of. Phenolphthalein and stir bar: place on plate and gently stir, titrate until a faint pink colour stays for at least 30s, perform at least three titrations and record data in table 1. Use one run for a quick estimate of how much naoh will be needed, and then pour quickly until about 5ml less than the estimate. Slow down the flow when pink first appears. Part 2: titration of unknown weak acid: fill buret to 0. 00ml, before adding naoh, click collect and monitor ph for. Check that meter shows acidic ph: once stabilized, click keep, in edit box type 0 for 0ml added, press enter to store first data pair, add the next increment of naoh (about 1ml or enough to +0. 15 ph). Printing: click on frame of table window and choose print.