Chemical Properties Of Binary Compounds

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Experiment 1
Prelab : Compound Molecular Weight (g/mol) Melting / Boiling Point (°C) Density (g/〖cm〗^3) Characteristics
Sodium Bromide, NaBr 103 747 / 1390 3.2 White crystal, cause skin and eye irritation
Bromine, 〖Br〗_2 160 -7.2 / 58.8 3.1 Red liquid, corrosive Chemical properties of binary compounds of group 1 : Halides Hydrides Oxides Diagonal relationship
Purpose :
Part I
Part II – To diagnose diagonal relationship.
Step-wise procedure :
Part I Prepare 40mL of concentrated 〖Na〗_2 〖CO〗_3⦁〖10H〗_2 O solution. Weight Fe powder on XXXX balance and transfer to a 250mL Erlenmeyer flask. Measure 16mL of water using a graduate cylinder, mixed it with Fe in Erlenmeyer flask and set into ice bath in fume hood. Add 3.8g ( XXmL) of 〖Br〗_2 dropwise from burette to Erlenmeyer flask and stir the solution with a glass rod simultaneously. Filter the mixture using gravity filtration method into porcelain dish and add 1.4g (XXmL) of 〖Br〗_2. Boil the content in the porcelain dish on a hotplate. At the same time, add concentrated 〖Na〗_2 〖CO〗_3•〖10H〗_2 O solution dropwise with Pasture pipette and stir it. Test the basicity of the solution using universal indicator (strips turned blue). Filter off the precipitate when solution reached room temperature. Wash precipitate with 10 – 15mL hot distilled water. Transfer filtrate to large evaporation dish. Heat the content on hot plate together with not more than 2 boiling chips in fume hood. Cool it in ice bath when crystals
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