Separation of a Solution: Dissolved Solid and Water

• Question– How can we separate and identify the dissolved solid?

• Materials– 50 mL Beaker– Ceramic crucible– Graduated cylinder– balance/scale– Soluble solid– hot plate– Lab scoop– safety goggles– Rubbing alcohol– Plastic dish

• Procedure and Data– Measure 3 g. of the solid – Measure 20 mL of water– Add both the solid and water to the small beaker and stir over

until dissolved.– Pour solution into crucible. Boil off the liquid at a medium-high

temp, reserving the solid before it reaches its melting point!– When the solid is recrystallized, scrape it into weighing dish. – Measure mass on digital balance– Record the physical characteristics: Ex. solid, crystalline,

metallic, etc– Measure volume by displacement in alcohol. – Calculate density (D=mass/volume)– Conduct a flame test for color when burning.

Data CollectionPhysical Properties – phase at room temp, color, texture, brittle or ductile

Mass Volume DENSITY = mass/volume

Flame Test for color

Analysis and Conclusion

• What evidence do you have that the substance dissolved in water versus reacted with the water?

• What is the solvent and what is the solute in this investigation?

• Explain how you separated the dissolved solid from the water. • Consult Sludge Matrix. • Based on the evidence, can you infer what the dissolved solid

is?• Make a claim using evidence for support. • Use as many pieces of evidence/data from your lab as you

can.