General Chemistry LaboratoryUniversity of Kentucky

Standardization Standardization and Titrationand Titration

TitrationTitration

Quantitative technique When done carefully, results are

accurateprecise

Primary Standard - KHPPrimary Standard - KHP

Stable at room temperature Easily dried Will not readily absorb water Mass can be accurately determined

Use mass to find moles

StandardizationStandardization

Concentration of unknown acetic acid

Concentration of NaOH

Accurate mass of KHP

ProcedureProcedure

Write the procedure before you come to lab in your lab notebook.

Day 1 – Should complete 3 GOOD standardization titrations of the NaOH

Day 2 – Should complete 3 GOOD titrations of the acetic acid

Experiment TipsExperiment Tips

Do no refill NaOH bottle. Fill bottle at start of experiment.

Do one quick titration with large increments to see determine the approximate equivalence point.

Do smaller increments for your three good titrations.

You should see two graphs on the screen. If you do not see the 2nd derivative graph, notify your TA.

Experiment TipsExperiment Tips

Swirl solutions after every addition of NaOH. Burettes can be read up to the 2nd decimal

place. Record EXACT volumes added; each increment

does not have to be exactly the same. Do not put spatulas into your solutions. Rinse sensor before and after use.