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- Althea extracted 2g of pure dry salt frame 6g of rock salt. The mass of the salt obtained is less than the mass of rock salt because the rock was removed by ______?a dissolvingb. distillationc. evaporationd. decantation5. A mixture of different colored inks can be separate using ______?a. chromatographyb. distillationc. evaporationd. distillation6. what is one property of a suspension that is different from that of a solution or colloid?a. the particles of a suspension will settle down upon long standing.b. the particles of a suspension reflect light.c. A suspension is always clear.d. A suspension is colorless.TRUE OR FALSE Powders that have low density and high porosity are free flowing. Surface roughness leads to poor flow characteristics. Micromeritics affects the maximum penetration of inhalation aerosols based on particle size. The greater the number of particles per dose, the lower the variability between dosage units. Bulk volume is the volume of spaces. Laser light scattering technique enables the use of surfactants to determine the primary particle size. The bioavailability of poorly soluble drugs influenced by state of subdivision of the drug. Spatulation is the technique of choice when blending small amounts of powders. Bulkiness decreases with increase in particle size Powders require disintegration before the onset of action. The more asymmetric a particle, the greater the surface area per unit volume Packing is the ratio of the void volume to the bulk volume.1. The following data were obtained after the moisture and total ash content determination of acacia powder: Wt. of empty crucible 52.452 g Wt. of crucible & sample 61.648 g Wt. of crucible & sumple after drying to constant wt. 60.502 g Wt. of crucible and residue left after incineration 53.006g • Moisture content in grams • Total ash content in grams Percent total ash 2. Find the acid numher of a rosin sample weighing 1.100g which required 28.00 ml. of 0.1100 N NaOH to bring the endpoint. 3. Find the SV of cottonseed oil if a 1.532 g of sample, refluxed with 25 mL of about 0.5 N alcoholic KOH, required 15.70 ml of 0.5100 N HCI for the residual titration. The hlank was run using the same volume of 0.5 N alcoholic KOH and required 26.00 ml of 0.5100 N HCI to bring about the endpoint 4. If a sample of white wax is found to have an ester value of 65.7 and a saponification valuc of 74. What is the acid value of the sample? 5. Determine the iodine value of an unknown sample of oil weighing…
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- During the course of an analysis for a solid sample, a loss of 0.40 mg occurs. Calculate the percentage (%) of relative error due to weight loss inherent in the method. A. When the method is performed on a sample with a total weight of 4.0 mg. B. When the method is performed on a sample with a total weight of 400.0 mg. C. Briefly, discuss what would be the most appropriate sample size ((a) or (b)) for the analysis assuming that weight loss is inherent in the method and is not due to gross error.6. The following are disadvantages of using filter paper in gravimetry, which is not included? a. React with strong acids and strong bases b. Break under mild stress c. Ashless filter paper is used d. Prevent use of suction 7. Which of the following can not be used to minimize supersaturation and thus used to crystalline properties? а. Нeating b. Using dilute solutions c. Rapid addition of the precipitating agent d. Air control3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.
- 7. Determine the effective diffusivity for a substrate passing through each of the following membranes: The substrate has a free solution diffusivity (D.,.) of 8.13 * 106 cm²/s and has a molecular radius of 7.54 Å (Angstroms). Membrane Type Mean pore diameter (nm) Porosity (%) Tortuosity Cellulose-1 12.16 67.9 2.97 Cellulose-2 9.65 78.7 1.76 Which membrane would you recommend using to avoid diffusion-limited reactions? Acrylic Fiber 8.72 85.9 3.831. The properties that must be possessed by the adsorption reagent in air sampling are…a. Reagents must be resistant to oxidationb. Reagents must be qualitativec. Reagents must be applicable to all gaseous analytesd. Reagents must be in large quantitiesThe solvent in a collodial system is also known as the [ ?] phase. A dispersed particle dispersion medium