6. Zinc Sheet: a rectangular, thin, sheet like metal, gray/silver. 6 5 4 3 2 1 * Solubility of solid iodine; 1. Solid iodine in 1 mL of water is slightly soluble, because the solution turns into a light brown/yellow color. However majority of the solid Iodine was left at the bottom of the test tube; which leads to the conclusion that it’s not reactive on water.
The indicator Phenolphthalein was the substance used to signal when the titration reached the point at which the reactants are stoichiometrically equal as defined by the balance reaction equation. Phenolphthalein is a chemical compound with the formula C₂₀H₁₄O₄ and is often written as "HIn" or "phph" in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. Sodium hydroxide or Hydrochloric acid would not have been as effective or accurate because they would have reacted with the water vapor from the air. In this lab setup, graduated cylinders or beakers were not used.
McGraw-Hill companies, Inc.) Although sulfuric acid served as the acid in the reaction, it is also the catalyst in the over-all reaction. Water, attached to N, is good leaving group so it is eliminated to form the nitronium ion. The ppt was further recrystallized and purified. It was first dissolved in hot dH2O and then hot gravity filtration was performed. Many insoluble substances were isolated and cream in color.
The final crude product yield was 0.91g and the pure product yield was 0.36g. Error may have occurred during the extraction phase. Although I extracted twice with Sodium Chloride, if waste was not completely removed, it would affect the purity of the product. The distillation process may have also affected the pure product. The lab manual recommended that 0.5mL of waste be removed during distillation; otherwise it would affect the purity of the product.
Redox Arena Lab Report Part 1 Observations of Standards Shown below and Included within the lab notes on page 11. Iodine Crystals: It was very small, round, and grey substance. Granular Zinc: It was a silver, small, grain shaped substance. It was also very hard and was slightly lustrous. Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color.
To best imitate the consistency of oil we used motor oil. Also we added salt to the water to best imitate a normal situation. Our projects may have had certain glitches because the water was not the exact same as ocean water and motor oil is not the same as the raw oil in the Exxon Valdez company oil spill. Dispersants reduce the surface tension that stops oil and water from mixing which causes small droplets of oil to be formed, which helps a quicker dilution of the oil. When the droplets are formed they rise to the surface because they are less than water and are evaporated.
Each of these indicators will be used to show the various colors created when diluting the acids and bases. When measuring the dilutions 1.0 M HCl can be serially diluted from pH < 1 until its pH reaches 7.0 and 1.0 M NaOH can also be diluted from pH > 14 until it reaches 7.0. In the middle well there is just purely water because it is the most neutral substance, neither acidic nor basic. Water has Hydrogen and hydroxide ions, which helps determine if the substance is an acid or base. The acids are determined on how much H they have and bases are determined on how much they mess with the hydrogen concentration.
Buffers work by having molecules bind to free H+( acid) or OH- ( base) to reduce the acidity or basicity of a solution. Why are we using buffers for the pHs of 7 and 9? Buffers are being used for the pH of 7 and 9 in order to maintain a constant pH through the reactions and ensure proper functioning of the enzymes. Without buffers the pH would change and we would not get correct results for our simulated digestive system reactions. Benedicts Solution Iodine Litmus Cream Biuret Reagent What do these
At 50C our results indicated a solubility of 89 g/100mL of H2O which was close to the known solubility of 80 g/100mL. Introduction: When a salt, such as potassium nitrate or sodium chloride, is placed in water a dissolving reaction will occur. At first, the positive and negative ions of the salt compound are only attracted to each other. In order for the salt to dissolve, these bonds must be broken so that the ions disassociate from each other. In the water molecules, hydrogen is slightly positive and oxygen slightly negative so they are attracted to ions of the opposite charge, known as dipole attraction.