16 solubility
TRANSCRIPT
General Chemistry LaboratoryUniversity of Kentucky
Solubility of Calcium Hydroxide
Preparation
Write the procedure for the experimentProcedure should contain enough
detail so someone else could replicate it without additional information
Determine the approximate mass of Ca(OH)2 to use for your saturated solution
Both must be done before you come to class
Experiment
Three partsPreparing saturated solutionStandardization of HClDetermine [OH¯]
Saturated Solution
Prepare saturated solution on Day 1 Save for Day 2 to complete titrations
Standardization of HCl
Record exact mass of Na2CO3 used for each trial
Do not refill HCl bottle during experiment
Save HCl solution for next week’s lab
Titration: HCl and Ca(OH)2
Filter Ca(OH)2 before using Titration will have two equivalence
points; sometimes only one will show
Ksp
Review solubility and Ksp in your textbookSetting up a Ksp expression
Calculations involving Ksp
Experiment Tips
Need three good titrations for each part
Titration curves may only show one equivalence point even though there are twoFirst one is sometimes hard to seeContinue until data plateaus
Experiment Tips
Record exact volumes used for all masses and volumes
When using buret, estimate the second decimal place
Mix after every addition to get accurate pH values