Solubility lab procedures

Part 1- determining solubility in an inorganic solvent

1) fill medium sized test tube halfway with water (water = inorganic solvent)

2) add small quantity of sodium chloride as INORGANIC SOLUTE to the test tube and MIX WELL

3) repeat using salicylic acid this time as ORGANIC SOLUTE

Part II- determining solubility in ORGANIC solvent

1) fill that same medium TEST TUBE with ETHANOL (organic solvent)

2) add sodium chloride and mix well (inorganic solute) - mix well

3) repeat with salicylic acid (organic solute)

Parts I and II

Physical properties

Part III switches to…

Chemical properties

Part III- testing for presence of C, N, and S (CARBON PART)

Carbon procedure = put small scoop of STARCH (organic) in a PORCELAIN EVAPORATING DISH

Heat over the hot plate and answer the following- does starch char?

Part III - nitrogen part

Place small amount of UREA (CO(NH2)2) (solid ) and MIX with EQUAL AMOUNT OF SODA LIME

Place test tube in a BEAKER

Heat carefully on hot plate

REMOVE BEAKER and note odor of gas evolved while testing the vapor with MOIST RED LITMUS PAPER at the MOUTH of the test tube

Never put ____ in the sink

SOLIDS- THROW THEM AWAYYYY

Part III - Sulfur part

1) 5 mL of EGG ALBUMIN solution and 2 mL of SODIUM HYDROXIDE in a test tube

2) place test tube in WATER BATH and let solution BOIL FOR A MINUTE

3) Cool the solution, add 3 drops of 5% lead acetate into the test tube

Part IV- Conductivity experiment

Back to PHYSICAL PROPERTY (in this case, electrical conductivity) of organic and inorganic compounds

1) watch lab instructor to see how to use the CONDUCTIVITY APPARATUS

3) use the apparatus to observe the DIFFERENCES IN CONDUCTIVITY of…

• distilled water

• NaCl (solid)

• NaCl (aq)

• Methanol

• salycilic acid in methanol

Distilled water should be a ….

POOR CONDUCTOR ( no ions or substances that can conduct electricity well)

Electrolyte

Solution that conducts electricity due to MOBILE ions (electrically charged particles that form when SALTS and INORGANIC COMPOUNDS dissociate)

Miscible

Liquids coming together UNIFORMLY

Immiscible

Liquids that DO NOT MIX/COME TOGETHER

Solubility is dependent on….

The nature of solutes and solvents (like dissolves like- e.g: polar solvents dissolve polar substances)

Temperature (higher temp= better solubility)

Pressure