1 / 5

Warmup (10 minutes)

Warmup (10 minutes). Complete the prelaboratory of the Precipitation Lab by yourself. Use pencil.

denton-thornton
Download Presentation

Warmup (10 minutes)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warmup (10 minutes) Complete the prelaboratory of the Precipitation Lab by yourself. Use pencil.

  2. Precipitation and Solubility Rulesconsider the dissolving process: PbI2 (s) Pb2+(aq)+ 2I-(aq) Soluble salt : ‘aqueous’; dissolves easily in water to make a concentrated solution of at least 0.1 M (moles per liter) at room temperature (25 ̊C). Insoluble salt: ‘solid’ or ‘precipitate’; doesn’t dissolve well in water; can only form dilute solutions of less than 0.001 M at room temperature (25 ̊C).* Slightly soluble’ salts fall between these extremes. this is the precipitation process: Pb2+(aq)+ 2I-(aq) PbI2(s) (ppt) You’ll need to memorize the solubility rules for the quiz. Let’s practice!

  3. Identify each ionic compound as soluble or insoluble. Justify your answer using the solubility rules. • PbI2 b. NH4Cl c. Fe2O3 a. insoluble: “I- ions generally form soluble salts… exceptions…..salts of Pb2+” b. soluble: “NH4+ ions form soluble salts….Cl- generally form soluble salts” c. insoluble: “O2- are usually insoluble” (Fe isn’t listed as an exception)

  4. Identify each ionic compound as soluble or insoluble. Justify your answer using the solubility rules. d. MgCrO4 e. Cu3PO4 f. NaC2H3O2 g. Cr(OH)3 d. soluble: “chromates are usually insoluble” (but MgCrO4 is listed as an exception) e. insoluble: “phosphates are usually insoluble” f. soluble: “alkali metals form soluble salts” g. insoluble: “hydroxides are usually insoluble” (chromium is not an exception)

  5. Precipitate lab! Compare prelaboratories with your group. Get stamped. Choose lab group roles such as the cap monitor! Etc. Begin lab! Clean the well plates out super super good with a sponge!

More Related