Pre-lab: Experiment 6 All Sections 1. Define the following terms: Surface tension Viscosity Freezing point Freezing point depression 2. What causes water hardnėss? Which of these can cause permanent and temporary hardness?
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- 7. Would it work to take the melting point by using the same capillary tube for both trials? Solid melt(1) -solidify melt(2)-A student was careful to make and stir all of her standard solutions immediately before measuring their turbidity for her calibration curve. However, she let her tap water solutions sit for 10 minutes prior to measuring their turbidity. If she measured the top portion of the solution, would her experimental sulfate ion concentration be higher or lower than it should be?What roles do solvent, density and polarity play in liquid/liquid extraction
- Which statement is valid when the multiple extraction and single extraction is compared. The effciency of multiple extraction and single extraction is incomparable. Single extraction and multiple extraction have the same effciency Multiple extraction is more efficent than single extraction Single extraction is more efficient than multiple extractionWhich is the most appropriate way to dispense liquid using a dropper (vertical, 45° angle, or horizontal? Justify your answerMake a results and discussion in Laboratory Report Format of the following: 1. Separation of mixture using different techniques 1.1 Simple distillation: Water + acetone 1.2 Fractional Distillation: Methanol + ethanol 1.3 Chromatography: Separation of mixture of Red ink and blue ink 2. purification of impure samples by crystallization 2.1 Copper sulfate 2.2 Potash alum 2.3 Benzoic acid
- Using any chemical concept (like concepts in liquid liquid extraction, concepts in recrystlliazation, etc) in an expirment of extraction of Caffein, make a connection to ONE of the following: 1) an event in the news, 2) your career plans, 3) a hobby of yours, 4) another course you are taking, or 5) your personal life.Your writing should find at least one way, if not more, in which the chemical concept you have chosen to talk about is demonstrated in the connection.How can you tell that a compound is impure? (or pure?) What are the characteristics considered when taking a melting point? What is recrystallization? What is happening on a molecular level (videos are provided) How are solvents chosen for recrystallization? (single solvent or mixed-solvent system).What are the properties of a good solvent system? How are crystals collected?Take 100ml of the Foam Bath that contains Sodium Laureth Sulphate Cocamide DEA and add sodium chloride solution in incremental amounts whilst stirring, until more than 5% has been added. Note any physical changes that occur during the addition and stirring process.
- The density of the first fraction collected would be expected to be close to a value of ______. 1.00 g./mL 0.895 g/mL 0.789 mL 0.950 g.mLRead the detailed procedure of an experiment in your screen. Evaluate each step in the procedure whether it belongs to HOMOGENIZATION, EXTRACTION, PURIFICATION/CONCENTRATION, DATA TREATMENT, or INSTRUMENTAL ANALYSIS step.DATA Note: Use the videos as references except when data is provided here. Table 1. Selection of Recrystallizing Solvent. Solvents Dissolution at room temperature? (+ or −) Dissolution at elevated temperature? (+ or −) Distilled water - - Acetone + n/a 95% ethanol - + Toluene + n/a Solid sample: Naphthalene Table 2. Mass Measurements. Mass, g Sample solid 0.5021 Empty watch glass 35.7602 Watch glass with recrystallized sample 36.2485 Table 3. Melting Point Determination. Temperature, oC Appearance of Sample in Capillary Tube … Solid 78.4 Solid 79.3 Solid with signs of liquid 79.9 Solid, liquid 80.6 Liquid, solid 81.3 Liquid with signs of solid … Liquid Theoretical Melting Point, oC: 80.2°C (176.4°F) QUESTIONS Which solvent should be used as the recrystallizing solvent? Check if your chosen solvent satisfies all characteristics of a good…