Separating the Components of a Ternary Mixture Purpose of the

Separating the Components of a Ternary Mixture Purpose of the Experiment To separate the components of a mixture of sand, sodium chloride, and calcium carbonate and to calculate both the percentage of each component in the mixture and the percent recovery of each component.

Matter Mixtures Pure substances Compounds Homogeneous Heterogeneous Elements

Physical Change Chemical Change Easily reversible Not easily reversible No new substances are formed New substances are always produced Mass of the individual substances not changed Mass of individual substances changed Small changes in thermal energy (i.e., the latent heat of fusion and / or vaporization) Considerable changes in thermal energy normally involved

Examples of Chemical Changes from Today’s Experiment: CaCO3 HCl CaCl2 CO2 H2O CaCl2 (K2CO3) ?

Various Methods for Separating the Components of a Mixture Chromatography: separating components of a mixture that have differing adsorptive tendencies on a stationary phase as the mixture is passed over or through the stationary phase . Chromatography of plant pigments Distillation: Separation through vaporization of a liquid from a solid, or another liquid, followed by vapor condensation. Distillation is used in many different industries including chemical, brewery and pharmaceutical.

Extraction: removing a substance from a solid or liquid mixture by adding a solvent in which the substance is more soluble. Centrifugation: removing a substance from a solution by means of a centrifuge.

Crystallization: forming a crystalline solid by decreasing its solubility as a result of cooling the solution, evaporating the solvent, or adding a solvent in which the solid is less soluble such that solid crystals form. Crystals of insulin grown in space let scientists determine the vital enzyme's structure and linkages with much higher resolution than Earth-grown crystals. mineral aquamarine Sublimation of Iodine Sublimation: vaporizing a solid and subsequently condensing its vapor.

Filtration: removing a solid substance from a liquid by passing the suspension through a filter. Crude oil filtration (vacuum filtration) Gravity Filtration Decantation: a process for separating the liquid component of a solid—liquid mixture from the solid by pouring. Decanting whey from the curds in cheese making. Decanting a solvent from a solute.

CHEMICAL CHANGES REACTIONS Reactants and Products Formation of Sodium Chloride Salt. http://www.youtube.com/watch?v Ftw7a5ccubs CaCO3 Marble eroded by acid rain. http://www.youtube.com/watch?v VBReOjo3ri8

Solubility Charts Are Useful for Separating Components of a Mixture Cold water Hot water 3M HCl 3M NaOH Benzoic acid No Yes No Yes Mg(OH)2 No No Yes No Na2SO4 Yes Yes Yes Yes Zn(OH)2 No No Yes Yes The differing solubility of a compound in various solvents can be used to separate the compounds.

The differing solubility of a compound in: Cold water Hot water 3M HCl 3M NaOH Benzoic acid No Yes No Yes Mg(OH)2 No No Yes No Na2SO4 Yes Yes Yes Yes Zn(OH)2 No No Yes Yes

The differing solubility of a compound in: Cold water Hot water 3M HCl 3M NaOH Benzoic acid No Yes No Yes Mg(OH)2 No No Yes No Na2SO4 Yes Yes Yes Yes Zn(OH)2 No No Yes Yes

The differing solubility of a compound in: Cold water Hot water 3M HCl 3M NaOH Benzoic acid No Yes No Yes Mg(OH)2 No No Yes No Na2SO4 Yes Yes Yes Yes Zn(OH)2 No No Yes Yes

The differing solubility of a compound in: Cold water Hot water 3M HCl 3M NaOH Benzoic acid No Yes No Yes Mg(OH)2 No No Yes No Na2SO4 Yes Yes Yes Yes Zn(OH)2 No No Yes Yes

Soluble in H2O Reacts with 3M HCl *TODAY’S EXPERIMENT: SiO2 No No NaCl Yes No CaCO3 No Yes 2.5 to 3.0 grams unknown only. 10.00 g* of SiO2 NaCl CaCO3 Filtrate? Step 1? Residue? 2.

Soluble in H2O Reacts with 3M HCl *TODAY’S EXPERIMENT: SiO2 No No NaCl Yes No CaCO3 No Yes 2.5 to 3.0 grams unknown only. 10.00 g* of SiO2 NaCl CaCO3 Filtrate 1. Add Water Residue SiO2 (s) CaCO3 (s) NaCl (aq) 1.80 g Step 2? Filtrate? Residue?

Soluble in H2O Reacts with 3M HCl *TODAY’S EXPERIMENT: SiO2 No No NaCl Yes No CaCO3 No Yes 2.5 to 3.0 grams unknown only. 10.00 g* of SiO2 NaCl CaCO3 1. Add Water Filtrate Residue SiO2 (s) CaCO3 (s) NaCl (aq) 1.80 g 2. React with HCl Filtrate Residue CaCl2 (aq) SiO2(s) 3.20 g Step 3? Filtrate? Residue?

Soluble in H2O Reacts with 3M HCl *TODAY’S EXPERIMENT: SiO2 No No NaCl Yes No CaCO3 No Yes 2.5 to 3.0 grams unknown only. 10.00 g* of SiO2 NaCl CaCO3 1. Add Water Filtrate Residue SiO2 (s) CaCO3 (s) NaCl (aq) 1.80 g 2. React with HCl Filtrate Residue CaCl2 (aq) 3. React with K2CO3 Filtrate KCl (aq) Residue CaCO3 (s) 4.10 g SiO2(s) 3.20 g

Soluble in H2O Reacts with 3M HCl *TODAY’S EXPERIMENT: SiO2 No No NaCl Yes No CaCO3 No Yes 2.5 to 3.0 grams unknown only. 10.00 g* of SiO2 NaCl CaCO3 1. Add Water Filtrate Residue SiO2 (s) CaCO3 (s) NaCl (aq) 1.80 g 2. React with HCl Filtrate How many grams were recovered? What is the Percent Recovery? Residue CaCl2 (aq) 3. React with K2CO3 Filtrate KCl (aq) Residue CaCO3 (s) 4.10 g SiO2(s) 3.20 g

Side arm or filtration flask A filtration flask looks like an Erlenmeyer flask with a short side arm. The "arm" is designed to connect the flask to a vacuum source. When sealed on the top with a stopper or a Büchner funnel, the vacuum flask will maintain a reduced pressure.

Büchner Funnel Stemmed Funnel Stemless Funnel A Büchner funnel is the white porcelain funnel. It requires an adaptor or rubber stopper with a hole in it to connect it to the top of a filtration flask. A Büchner funnel is used exclusively for vacuum filtrations.

Procedure for Vacuum Filtration 1. Clamp a filtration flask securely to a ring stand. 2. Place rubber* stopper in the top of the filtration flask. 3. Place the Büchner funnel on the adaptor. *Note: Our Buchner funnels already have the rubber stoppers attached.

Procedure for Vacuum Filtration 4. Obtain a piece of filter paper. 6. Place the filter paper in the Büchner funnel. 5. If required weigh the filter paper. 7. Make sure all of the holes in the funnel are covered. 8. Connect the side arm to a vacuum source. 9. Make sure both ends are firmly connected.

10. Wet the paper with a small amount of the solvent to be used in the filtration. We will be using distilled water as our solvent. The distilled water may be sprayed directly from the bottle – i.e., it is not necessary to use a beaker to pour the distilled water. 11. Turn on the water aspirator or vacuum pump. Check to make sure the distilled water you placed on the filter paper is

12. Carefully pour portions of the solution onto the center of the filter paper. 13. Notice that the vacuum will pull the solvent through the filter and into the filtration flask.

14. Make sure the entire contents are transferred to the funnel. (If necessary use distilled water to wash contents into funnel.) 15. Disconnect the vacuum at the flask before turning off the water aspirator. (This prevents water from being sucked back into the vacuum flask.)

16. Using the forceps, carefully remove the filter paper and solid from the Büchner funnel. (Note: You may have to use your microspatula to pry up the corners before you use the forceps.) 17. Place the filter paper and solid in a casserole or evaporating dish *. (*A watch glass is shown here – Do NOT use a watch glass.) 18. Transfer casserole to a hotplate using beaker tongs. Dry the product.

Checkout from Stockroom Return Used/Discard Buchner funnel 2 pieces of Filter Paper* Filter Flask (*you can have extra if needed) Forceps (Tweezers) Beaker Tongs Striker Vacuum Tubing Unknown Sample – it is very important that the unknown number be recorded on the data sheet. (Note: The unknown number is not 375 – that is the experiment number!) Reminders: 1. Check Bunsen burner tubing for cracks. Do not use if cracked. Exchange in stockroom for new tubing. 2. Vacuum Filtration System: a. Disconnect tubing before shutting off water. b. The stopper on the funnel should fit about halfway. c. Pour contents of beaker while swirling beaker to keep solids suspended. Direct flow towards center of filter paper.

Hazards: 3 M HCl is a corrosive strong acid (neutralize spills with NaHCO3) Hot glass looks like cold glass, but HOT glass burns. Waste: Liquid Waste should go in the carboy marked “Ternary Mixture”. Solids should go in the bucket marked “Used Solids.”

For February 24-26 Read: Mystery of the Thirteen Test Tubes p. 117-130 & Packet pp. 211-218 for Li2CO3 & Pb(CH3CO2)2 Turn-In: Ternary Mixture Lab - Datasheet Post-Lab Questions pages 113-116. Calculations Page for * items on p. 113. Midterm Exam (Mar. 3-5) (During First Hour Of Regularly Scheduled Class Time.) Exam Review ?day – Feb. ? ?-? pm – G3 Schrenk