Question

Part A: Calculation for % water of hydration and formula of the hydrate Formula of anhydrous salt Na2CO3 Mass of empty dry crucible and lid 19.219 g Mass of crucible, lid and the hydrate before heating 20.432 g Mass of crucible, lid and residue (anhydrous salt) after heating 20.211 g Mass of crucible, lid and residue (anhydrous salt) after additional heating Mass of hydrate, (#3 — #2) Mass of residue, the anhydrous salt ((smaller of #5 or #4) — #2) Mass of water lost, (#6 — #7) Molar mass of water Molar mass of anhydrous salt Moles of water = ( mass of water lost, #8 / molar mass of water, #9 )

          Part A: Calculation for % water of hydration and formula of the hydrate

Formula of anhydrous salt Na2CO3
Mass of empty dry crucible and lid 19.219 g
Mass of crucible, lid and the hydrate before heating 20.432 g
Mass of crucible, lid and residue (anhydrous salt) after heating 20.211 g
Mass of crucible, lid and residue (anhydrous salt) after additional heating
Mass of hydrate, (#3 — #2)
Mass of residue, the anhydrous salt ((smaller of #5 or #4) — #2)
Mass of water lost, (#6 — #7)
Molar mass of water
Molar mass of anhydrous salt
Moles of water = ( mass of water lost, #8 / molar mass of water, #9 )

Part A: Calculation for % water of hydration and formula of the hydrate

Formula of anhydrous salt Na2CO3
Mass of empty dry crucible and lid 19.219 g
Mass of crucible, lid and the hydrate before heating 20.432 g
Mass of crucible, lid and residue (anhydrous salt) after heating 20.211 g
Mass of crucible, lid and residue (anhydrous salt) after additional heating
Mass of hydrate, (#3 — #2)
Mass of residue, the anhydrous salt ((smaller of #5 or #4) — #2)
Mass of water lost, (#6 — #7)
Molar mass of water
Molar mass of anhydrous salt
Moles of water = ( mass of water lost, #8 / molar mass of water, #9 )

Added by Douglas G.

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