Chemistry Honors Class 34 – Gravimetric Analysis Lab

Filtration Setup

Purpose

The purpose of this lab is to determine the percentage of metal in a solid ionic salt

Setup of Materials

Clean and rinse the Gooch crucible / Buchner funnel with tap water followed by distilled water
Set up the filter flask and ring stand for filtration (see picture above)
Obtain a filter paper and place in the crucible / funnel
rinse the paper and crucible / funnel using suction in the flask setup
place the crucible / funnel into a clean, dry beaker
place the beaker, marked with pencil, into the drying oven
after the crucible / funnel is dry remove the beaker from the oven to cool
determine the mass of the clean, dry, cool crucible / funnel with filter paper
place the crucible / funnel back on to the filter flask setup

Preparation of Sample

Obtain a solid sample of an unknown metal ~~sulfate~~ CHLORIDE compound
Measure out approximately ~~0.5~~ 0.15 grams of the substance to the nearest 0.0001 g using the analytical balance
Dissolve the compound completely in approximately ~~250~~ 100 mL of distilled water
Add exactly 50 mL of the 0.1 M ~~barium~~ silver nitrate solution, using a stirring rod to ensure mixing
carefully pour the resulting solution, with precipitate, through the filtration setup
be sure and use the wash bottle to rinse the stirring rod and the funnel during filtration
remove the crucible / funnel, filter paper, and precipitate and place into a clean, dry beaker
let the beaker and crucible / funnel dry overnight

Disposal of Materials

after determining the mass of the precipitate place the contents of the funnel in the waste beaker
rinse all of the extra solution into the liquid waste beaker before cleaning with water

Measurements

Calculations

Chemteacher