CHE 132 Lecture Notes - Lecture 25: Chemical Species, Barium Chloride, Weak Base

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 132
• Professor: Fernando Raineri

Document Summary

Che 132 lecture 22: review: this class was designed as a review session for the 2nd exam, to identify if a salt is acidic, basic, or neutral: Break the molecule down into an anion or cation. If the ions came from a strong acid or base, then that ion is neutral. Make sure to convert everything correctly based on what you"re given. The larger k value will make that solution either basic or acidic: remember that an anion of a polyprotic acid can be acidic although not normally the case, example: Will a precipitate form? (. 300m bacl2)(. 050l) = . 015 moles (. 100m k2so4)(. 050l) = . 0050 moles. [ba2+]initial = . 0150 moles / . 1l = . 150m. A precipitate will from since q > k . (k = 1. 5 x 10-9: how do you know when a precipitate will form, you compare the calculated q values from the k values. If q < k, then a precipitate won"t form (favor products)