Jacob Gold Section 004B- Q12 02/07/2024 1 A. Color of ferric chloride solution: Yellow Color of Mixture: reddish orange (dark red) Type of Colloid: Sol Observations on filtering: filter paper turned an orangey yellow color 1 B. Visibility of light beam: In Colloid: dispersed light beam In Deionized water: Visible Name of effect: Tyndall effect 1 C. Observations after adding salt and Centrifuging · MgCl2, NaCl & the gelatin did not make the colloid coagulate · N? SO effectively made the colloid coagulate as the colloidal particles settled at the bottom of the test tube forming a precipitate. Ions added to colloid: Chloride and Sulfate Ion(s) causing coagulation: SO42- Ion(s) causing coagulation most effectively: Sulfate ions Charge on the colloid(positive or negative): positive 1D.Observation on effect of gelatin: Gelatin turned the solution to a lighter orange color and when it was centrifuged there was no coagulation that occurred. 2. Observations on shaking and setting: Test tube A: did not mix there were 0 drops of detergent added. Test Tube B: partial emulsion occurred and 1 drop of detergent was added. Test Tube C: full emulsion was observed 5 drops of detergent was added. 3. Observations Before ignition: solution became a gel like substance
Upon ignition: alcohol was burned down from the gel like substance created from a mixture of ethanol and calcium acetate Type of Colloid: Solid Emulsion(gel) 4. Observations Placing watch glasses containing HCl and NH3 side by side: When the 2 solutions were placed next to each other they smoked and created a colloid known as an aerosol. This proves that a reaction was occurring as smoke formed Thought Questions 1. Explain how the added salt coagulated the ferric hydroxide colloid Since SO42- is an extremely negative ion this means that the colloidal particles must carry charges opposite of the negative this in turn will create a neutral charge and the uncharged or neutral particles are the ones that coagulate. 2.a) Explain the function of gelatin in this experiment Gelatin's function in this experiment is to act as a protective colloid. This means that the colloid is going to be protected from coagulation because the gelatin forms a thin film around the particles that are dispersed. b) What name is given to this type of colloid? Sol 3. Explain the function of detergent used in this experiment Detergent is used as a micelle. What this means is that they have a nonpolar center that tends to gravitate towards the oil which in turn traps it inside. The outer part of the micelle is polar so it will be bonded to the water. This causes the oil and water to emulsify. 4. a) Write the balanced chemical equation for the reaction that occurred when HCl and NH3 were placed side by side? NH3 (g) + HCI(g) - NH4Cl(g)