a Malavika Nair 2 éve
183
Még több ilyen
Titrant
Volume of concentrated HCL solution needed to make up given volume of the dilute HCL solution stoichiometrically
Pour small amount of HCL into both glassware to rinse them
Some deionized water into graduated cylinder
Have to add water first to prevent splashing
Volume of needed concentrated solution with cylinder
Volumetric flask using the decanting method
Waste beaker
Need to know the molar concentration of diluted solution for further stoichiometric work
Primary Standard
Deionized water
It reaches fill line
Measure and record mass of Borax
3x with deionized water
250 mL beaker
Mix solute until all Borax solute is dissolved
Solution into volumetric flask by decanting
Beaker with deionized water
All solution is transferred
Funnel on top of beaker
Place glass rod on top of beaker
Pour solution into flask carefully
Diluted HCL solution reaches meniscus of fill line
Begin standardization
n=m/mm, c=n/v
It helps determine a more accurate concentration of the titrant for calculations
Needed molar concentration of titrant is determined
Standardized HCL into burette
Begin Titration
Erlenmeyer Flask
Until solution changes colour completely
Equivalence Point
Concentration of ammonia
C1V1=C2V2
1:1 molar ratio, ICE box, Kb/Ka
Moles of titrant equal moles of analyte, right before endpoint
Solution has reached end point due to a pH change, moles of titrant exceed moles of analyte
Borax solution in volumetric flask reaches meniscus of fill line
Need to have a reference molar mass for titration
3 times
