1 / 14

Using Tables F & G

Using Tables F & G. Table G. Expresses solubility as a function of temperature. Valid only for a specific amount of the solvent – 100 grams of water. Table G problems.

oprah
Download Presentation

Using Tables F & G

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. Using Tables F & G

  2. Table G • Expresses solubility as a function of temperature. • Valid only for a specific amount of the solvent – 100 grams of water.

  3. Table G problems • May have to do with the amount of solute or solvent required for a given amount of the other. Involve setting up a proportion. • Precipitation problems.

  4. Problem: How much KCl will dissolve in 300 grams of water at 50C? Use the graph to set up a proportion. 42 g KCl is to 100 g H2O as X g KCl is to 300 g H2O.

  5. Finding amount Solute 42 g KClX g KCl 100 g H2O 300 g H2O X = 126 g KCl =

  6. How much H2O is required to just dissolve 200 g NaNO3 at 20C? 88 g NaNO3 is to 100 g H2O as 200 g NaNO3 is to X g of H2O.

  7. Finding amount H2O 88 g NaNO3 = 200 g NaNO3 100 g H2O X g H2O X = 227.3 g H2O

  8. Precipitation problems • A saturated solution of KNO3 is prepared in 100 g of water at 50C and then cooled down to 10C. How much KNO3 will precipitate?

  9. 88 g KNO3 in 100 g H2O at 50C. 20 g KNO3 in 100 g H2O at 10C. 88 g – 20 g = 68 g KNO3 precipitates.

  10. Table F problems • Solubility guidelines for ionic substances in water. • The extent to which ionic compounds will dissolve in water depends on several factors. The solubility ranges from very low solubility – basically insoluble – to pretty soluble. • Use guidelines to predict if a given compound is soluble or insoluble.

  11. To use Table F • Separate the ionic compound into the positive ion and the negative ion. • Scan for both in Table F. • Left hand side is soluble compounds with exceptions. Right hand side is insoluble compounds with exceptions.

  12. Predict solubility of • LiCl • NH4F • Ca(HCO3)2 • BaSO4 • K2CO3 • CaCO3 • Mg3(PO4)2 • Ca(OH)2 Soluble – cmpd with a Group I ion Soluble – cmpd with NH4+ Soluble – cmpd with HCO3- Insoluble – sulfates with Ba+ Soluble – cmpd with a Group 1 ion Insoluble - most carbonates Insoluble – most phosphates Soluble – hydroxide with Ca+2

  13. Why do we need to predict solubility? • So we can determine the precipitate in a double replacement reaction.

  14. Predicting Products AgNO3(aq) + KCl(aq)  ? AgCl(s) + KNO3(aq)

More Related