1 / 6

Titration

Titration. A lab technique to determine the molarity of a compound. Basic premise…. A measured volume of a solution of unknown molarity is put into a flask Another chemical of known concentration is slowly dripped from a buret into the unknown and a reaction ensues

paul-mcintyre
Download Presentation

Titration

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. Titration A lab technique to determine the molarity of a compound

  2. Basic premise… • A measured volume of a solution of unknown molarity is put into a flask • Another chemical of known concentration is slowly dripped from a buret into the unknown and a reaction ensues • The reaction proceeds until it is indicated the reaction has reached completion • Using stoichiometry, the molarity of the unknown is ascertained

  3. Basic setup

  4. indicator • Usually, visual indication that the reaction has reached completion is used • A chemical indicator is one that changes color when the reaction has reached completion, known as the “end point” • For tomorrow: SCN-(aq) + Fe3+ (aq) Fe(SCN)2+(aq) (dark red)

  5. Tomorrow’s process… (1) A saturated solution of AgC2H3O2 is used: AgC2H3O2(s) Ag+(aq) + C2H3O2-(aq) - The solution has Ag+(aq) and C2H3O2-(aq) in equal amounts dissolved in the water (2) Ag+(aq) + SCN-(aq) AgSCN(s) (“beige” solid) Once all the Ag+ in the solution is precipitated away as AgSCN… (3) Excess SCN-(aq) + Fe3+ (aq) Fe(SCN)2+(aq)

  6. Ksp lab calculations • Read the volume of 0.033M SCN- dripped in off of the buret M x L = moles of SCN- • Because in balanced equation (2) the coefficients of SCN- and Ag+ are the same, the moles of Ag+ = the moles of SCN- • Knowing the volume of the sample of Ag+ that was titrated… [Ag+] = moles/L • Knowing that [Ag+] = [C2H3O2-] in the original saturated solution, calculate the Ksp of AgC2H3O2

More Related