Crystal making lab Purpose: To better understand saturated solutions‚ solubility . Analysis: 2. Why was it necessary to heat the water? Be specific. Heating the water allows it to hold much more borax in solution than it could at room temperature. So after the water cooled‚ the ability of the solution to hold the solute inside decreases‚this causes the excess borax in the solution to precipitate in crystal form on the string.When the water at a high temperature‚ water molecules have more kinetic
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physical properties of the compound were also determined. INTRODUCTION Differential solubility is defined as the differences in the amount of solid that can be dissolved in an appropriate solvent as affected by variations in temperature. Solubility is inversely proportional to its temperature‚ since most solids have solubilities that are lower in liquid solvents at low temperatures. Differences in solubilities are sometimes used in the process of obtaining pure compounds by dissolving the solid
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and will not scatter light. 8. What are the parts of a solution? SOLUTE Part being dissolving Ex: sugar‚ salt SOLVENT B. Part doing the dissolving C. Water is the universal solvent D. Ex: water‚ alcohol 9. Explain how to determine the solubility of a solution? Determined by attraction between solute and solvent 10. What are the three levels of solutions and how are they determined? Saturated Contains as much solute as
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Chemistry June Exam Notes Quantities in Chemical Reactions Molecular and formula mass o The mass of one unit of a compound (a molecule or a formula unit) o The sum of the mass of all the atoms in a compound o With knowledge of the mass of each individual atom‚ the percentage composition by mass can be determined The Mole (mol) o A counting unit‚ one mole refers to 6.02 x 1023 particles of any given substance o Known as Avogadro’s Constant and given the symbol NA Molar Mass o The
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so that the solutions were added together. You were supposed to observe the different reactions occurring. Once you observed each reaction take place‚ you needed to fill out your data table. Data Table: Solubility Rules Table | Negative Ion (Anions) | Positive Ions (Cations) | Solubility ofCompounds | All negative ions are with | Alkali ions (Na) | Soluble | All negative ions are with | Hydrogen (H+) | Soluble | All negative ions are with | All positive ions | Soluble |
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04% percentage yield. Introduction Recrystallization is a process of purifying organic compounds obtained from nature that contain soluble‚ insoluble and colored impurities. This is based on the premise that solubility increases on the increase of temperature while solubility decreases on the decrease of temperature. This is the process behind the formation of crystals. Recrystallization can be broken down into several steps. A suitable solvent is chosen followed by the compound being dissolved
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therapeutic effect. However‚ it should be noted that although the reduction of particle size increases the specific surface area and the dissolution rate‚ it does not affect solubility. The rate of dissolution may also be altered by choosing a suitable polymorph of a compound. Different polymorphs exhibit different solubility and dissolution rate
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Cobalt‚ Copper‚ Iron‚ Barium‚ Nickel List all of the anions used: Phosphate‚ Iodide‚ Sulfate‚ Chloride‚ Bicarbonate‚ Carbonate‚ Hydroxide Compare your results with the solubility rules and/or solubility table in your chemistry text. QUESTIONS: A - Do your results agree with your expectations from the solubility rules/table? Yes‚ I feel my results agreed with the expectations laid out in the rules and table from the lab. B - Which anions generally form precipitates? What are exceptions
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distillation and recrystallization using a suitable solvent determined through a solubility test. The identification method used was through Melting Point Determination. By obtaining data of the melting points of the 2 purified compounds and cross-referencing from a list of possible organic compounds‚ the 2 organic compounds were identified to be Dibenzalacetone (Neutral) and o-Chlorobenzoic acid (Acidic). Results A solubility test was conducted to determine the recrystallization solvent to be used for
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our alkane (Decalin). One would expect that non-polar solvents will dissolve alkanes because they are non polar as well 1. If the solvent did not dissolve in the alkane we heated the solution with a heat gun‚ because higher temperature increases solubility because energy in the form of heat can break bonds and allow for the molecules to join together. This is the reversed for a decrease in temperature the molecules move around less so there is less interaction between solute and solvent. We also
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