Chapter 6 Titrations Flashcards
What are titrations?
volumetric analysis where all of the volume measuring is done with a buret
What are the different types of titrations?
acid based
redox titrations (oxidation-reduction)
complexometric (metal ions & ligands)
psychiatric (used to adjust meds)
What happens during titrations?
enough titrant is carefully added to the analyte solution until the titrant has reacted with the analyte solution based on the stoichiometry of the balanced chemical reaction which is the equivalence point.
What is the endpoint of a titration?
when you stop adding titrant to the analyte
What is the indicator?
it is a solution added to the analyte to help you see the endpoint there should be a color change within the solution
What is titration error?
the difference between the equivalence point and the endpoint
What is a blank titration?
A blank solution contains everything but the analyte. You add enough titrant to the blank solution to see the endpoint. It should only require a small volume of titrant
What is a standardization concentration?
to help determine the concentration of a titrant solution, you would use a primary standard which is a pure stable reagent with a known composition. What you weigh is what you get. You heat it before it is used to remove absorbed water and cooled in a desiccator
What solutions are used for acid based Titrations?
potassium hydrogen phthalate (KHP) and Sodium carbonate (Na2CO3)
What are direct titrations?
Add titrant to analyte until stoichiometric reaction occurs according to the balanced chemical reaction
what are Indirect/Back titrations?
add an excess amount of the first titrant to the analyte solution and then add a second titrant to react with the excess of the first titrant. Adding excess of titrant pushes the reaction forward, favoring complete reaction with the analyte
