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combined all three sources and represented them as the dependence of the theoretical plate height (HETP) on the mobile phase linear velocity. Originally‚ it was introduced for gas chromatography‚ but it happened that the same physical processes occurs in HPLC‚ and this equation is perfectly fit for liquid chromatography. Multiple path The velocity of mobile phase in the column may vary significantly across the column diameter‚ depending on the particle shape‚ porosity‚ and the whole bed structure
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They found competition in those categories‚ brands that were already positioned in the market and Dettol couldn’t compete. The only product that was successful in sales was the soap and liquid soap‚ probably because these products are strongly associated with germ killing. It achieved 44% of value share in liquid soap.
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solvent Pressure of solution containing unknown mu = 8.69 g mp = 250 g Find Calculate the molar mass Mw‚u of this unkown compound. Strategy We’ll start with Raoult’s Law (eq 5.21 on pg 164) which relates the partial pressure pa of a liquid in a solution to its pure vapour pressure p∗ by its mole fraction in solution χa . a pa = χa p∗ a This allows us to calculate the mole fraction of 2-propanol χp (in the solution with the dissolved unknown) to the solutions vapour pressure pp
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Daphnia Experiment Report 1. Introduction Caffeine is found in many plant species‚ where it acts as a natural pesticide. It is found most commonly in cocoa‚ tea and coffee‚ but is also artificially added to some soft drinks such as cola to act as a flavour enhancer. When consumed by humans‚ caffeine works as a stimulant causing amounts of released neurotransmitters to be increased. High use of caffeine has been related with raised blood pressure‚ restlessness‚ insomnia and anxiety which‚ in
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solid dosage forms upon exposure to liquids into small fragments‚ which promotes rapid drug dissolution. The disintegration process for a tablet occurs in two steps. Firstly‚ the liquids wet the solid and penetrates the pores of the tablets. Thereafter the tablet breaks into smaller fragments. Disintegrants to be used in plain tablets are classified into: Disintegrants that facilitate water uptake -These disintegrants act by facilitating the transport of liquids into the pores of the tablet may
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Name: Soo Jin Park Date: 02/20/15 Exp 5: Liquids and Solids Lab Section: 73427 Data Table: Boiling Point Trial 1 Trial 2 Trial 3 Temperature when the last bubble has emerged __86.5˚C _89.4_˚C 87.6_˚C Average temperature from all three trials 87.8˚C % error __6.55_% Melting Point Trial 1 Trial 2 Trial 3 Temperature when the acetamide melts _85.7_˚C 89.5__˚C 87.4_˚C Average temperature from all three trials __87.5˚C % error __8.07__%
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Abstract: This experiment consisted of the separation of sodium chloride and silica. The mixture was separated by extracting the sodium chloride with water and drying both substances. Adding water to the mixture‚ stirring‚ then decanting the resulting liquid twice extracts the dissolved sodium chloride from the silica. Heating both sodium chloride and silica separately provides the mass of each. The data from this experiment can be used to calculate the percent composition of sodium chloride and silica
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Hi‚ my name is water molecule! H2O for short. I live in the bottom of a well. I come from 2 hydrogen atoms‚ but I have an oxygen atom in me! Down here in my well‚ we have a swell time together. In our liquid state‚ we are not too far apart‚ nor too packed together. It’s really great being a liquid! I feel bad for my cousin CO2. He is probably sublimating into a gas from a solid‚ or as a gas‚ freezing back into a solid. He has no melting point‚ only a freezing and boiling point. I’m SO glad I will
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able to: Define Fluid State differences between solid and fluid Calculate common fluid properties: i. Mass density ii. Specific weight iii. Relative density iv. Dynamic viscosity v. Kinematic viscosity INTRODUCTION Fluid Mechanics Gas Liquids Statics i F 0 F 0 i Laminar/ Turbulent Dynamics ‚ Flows Compressible/ Incompressible Air‚ He‚ Ar‚ N2‚ etc. Water‚ Oils‚ Alcohols‚ etc. Stability Pressure Buoyancy Surface Tension Compressibility Density Viscosity Vapor
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