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Chemistry Honors Class 34 – Gravimetric Analysis Lab

Filtration Setup

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

  • mass of clean, dry, crucible / funnel with filter paper
  • mass of ionic solid sample
  • mass of dry crucible and precipitate

Calculations

  • Determine the mass of the precipitate formed
  • Determine the moles of sulfate chloride in the precipitate
  • Determine the mass of sulfate chloride in the original sample
  • Determine the percent composition of the original sample

Information

This entry was posted on October 30, 2014 by in Agenda, CLab, SHP-CH and tagged , , .

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