Intro/Purpose: The purpose of this lab was to use crystallization to separate a compound from a solvent and be able to choose the best solvent to do so. Then identify an unknown and verify purity using melting points. Solubility contributes to crystallization; because a solute has lower solubility at lower temperatures‚ which makes the solvent separate from the solution as a solid. This process is important to understand because it is very effective in separating compounds so we can get a closer look at
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ions‚ which go through the reaction unchanged. When you encounter net ionic equations on the SAT II Chemistry test‚ you’ll need to remember the following solubility rules‚ so memorize them! Also keep in mind that net ionic equations‚ which are the bare bones of the chemical reaction‚ usually take place in aqueous environments. Here are those solubility rules: Most alkali metal compounds and compounds are soluble. Cl-‚ Br-‚ I- compounds are soluble‚ except when they contain Ag+‚ ‚ or Pb2+. F- compounds
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States of Matter Jun Ruan Solid Molecules are tighly packed and harder than liquids and gases. Examples: Ice‚ Coal‚ Salt Amorphous solid-a solid which has a disordered atomic structure. Examples: Glass‚ Rubber Liquids flowing freely but of constant volume. Examples: Water‚ Mercury‚ Alcohol Viscosity-a measure of its resistance to gradual deformation by shear stress or tensile stress. Surface tension-the force that acts on the surface of a liquid and tends to minimize the surface
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there is no evident odor and seems to have a very high melting point as oppose to camphor which has a very strong‚ evident smell. 12. Water is a much more polar molecule than 2-propanol. How does the polarity of the liquid seem to influence the solubility of these solids? Water is more of a polar molecule then the given 2-propanol which allows ionic soild‚ sodium chloride that breaks off and becomes soluble. Camphor is not an ionic solid which means that it is not soluble in water although of the
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in order for the reaction to have a greater chance of occurring. Eventually the rate of dissolving will equal the rate of crystallisation. This is the state of saturation. This can be recognised by a constant colour or constant mass. The solubility product constant‚ Ksp is given in the following example: Ksp for AgCl is Ksp = [Ag][Cl] Ksp for PbI2 is Ksp = [Pb][I]2 This gives the relationship between the ions in the saturated solution and is the maximum
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REPORT FOR EXPERIMENT #2: PURIFICATION OF ACETANILIDE BY RECRYSTALLIZATION Your name TA’s name Your Partner’s name Lab Section OBSERVATIONS: A. SELECTING A RECRYSTALLIZATION SOLVENT | |Solubility Test (cold) |Solubility Test (hot) | |Water |insoluble |soluble | |pet ether |insoluble
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in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of solution as a solid. That insoluble compound is called a precipitate. HOW TO PREDICT WHETHER A PRECIPITATION REACTION WILL OCCUR? Solubility rules are useful summaries of information about which ionic compounds (or combinations of ions) are soluble in water and which are not. They are also important tools for making predictions about whether certain
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project include identification of drug (IR spectra and absorption maxima)‚ solubility
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Unit 8 Textbook Notes 12.1 The N2O4-NO2 Equilibrium System When you put a sample of N2O4‚ a colorless gas‚ in a closed container at 100C a reddish-brown color starts to show. This is due to NO2 formed by the decomp. of part of the original substance. The forward and reverse reactions are taking place at the same rate. The concentrations of species present remain constant with time. These concentrations are independent of the direction from which equilibrium is approached. The equilibrium constant
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These brilliant colors can be separated another way. This different technique‚ known as paper chromatography‚ separates mixtures in a liquid into individual components. The process of chromatography separates molecules because of the different solubilities of the molecules in a selected solvent. In paper chromatography‚ paper is marked with an unknown‚ such as plant extract‚ is placed in a developing chamber with a specified solvent. The solvent carries the dissolved pigments as it moves up the
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