Interpretation:Observation of original melting point as
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
Recrystallization is technique that is used for purification of organic compounds. This process includes dissolution of solid in specific solvent at high temperature and then crystals are made again by process of cooling. Temperature of crystals is decreased to allow impurities to remain in solution only.
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Chapter 3 Solutions
Experimental Organic Chemistry: A Miniscale & Microscale Approach (Cengage Learning Laboratory Series for Organic Chemistry)
- The volume of the mixture prepared by taking 1.158 moles and 0.842 moles of water and ethanol, respectively, at 25 ° C was measured as 68.16 cm ^ 3. Interpret the result by finding the volume change during the preparation of the mixture since the densities at 25 ° C for pure water and atanol are given as 0.9970 g / cm ^ 3 and 0.7852 g / cm ^ 3, respectively.arrow_forwardSi crystalizes into a diamond crystal structure with lattice constant a = 0.543\: nma=0.543nm. Calculate the atomic density in units of cm^{-3}cm−3. Values within 5% error will be considered correct.arrow_forwardWhat are the differences between a simple distillation and steam distillation?arrow_forward
- 5.0 mL of 1-butanol was mixed with 10 mL of HCl. The reaction was put on an ice bath and 4 mL of concentrated sulfuric acid was added. This mixture was refluxed for 45 min and then the product was co-distilled with water using a simple distillation apparatus. Water and the product are immiscible. 1-butanol has a molar mass of 74.12 g/mol, a density of 0.810 g/mL, and a boiling point of 118 C. The product has a molar mass of 92.57 g/mol, a density of 0.880 g/mL, and a boiling point of 78 C. What is the nucleophile in this reaction? What is the role of H2SO4 in this reaction? Calculate the theoretical yield for this reaction. Give your answer in grams. Select the following statements that can be said about the reaction shown.arrow_forwardI Review I Constant When a mixture of 10.5 g of acetylene (C,H2) and 10.5 g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H20. Part A Write the balanced chemical equation for this reaction. Express your answer as a balanced chemical equation. Identify all of the phases in your answer. ΑΣφ ? |2C, Н, + 50, >4CO, + 2H, О DA chemical reaction does not occur for this question. Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B Which is the limiting reactant? Express your answer as a chemical formula. O2 Submit Previous Answers v Correctarrow_forwardWrite the balanced COMPLETE ionic equation for the reaction when aqueous MgSO₄ and aqueous Ba(NO₃)₂ are mixed in solution to form aqueous Mg(NO₃)₂ and solid BaSO₄. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction. ☐⁴⁻ ☐³⁻ ☐²⁻ ☐⁻ ☐⁺ ☐²⁺ ☐³⁺ ☐⁴⁺ 1 2 3 4 5 6 7 8 9 0 ☐₁ ☐₂ ☐₃ ☐₄ ☐₅ ☐₆ ☐₇ ☐₈ ☐₉ ☐₀ + ( ) → ⇌ (s) (l) (g) (aq) Ba Mg S O N Resetarrow_forward
- What is the function of a desiccant in a set-up of volatilization gravimetry? To remove nitrogen from the sample To remove sulfuric acid from the sample To remove water vapor from the sample To remove carbon dioxide from the samplearrow_forwardWhat is the strength of the ionic interactions between an ion with 1 positive charges and an ion with 2 negative charges, when the distance between them is 19.4 nanometers and the solvent is water, at 25 oC with a dielectric constant of 78.5?arrow_forwardBriefly describe the principles for separating the components of a mixture by solvent extraction.arrow_forward
- A sample of 2.05 g of polystyrene of uniform polymer chainlength was dissolved in enough toluene to form 0.100 L of solution.The osmotic pressure of this solution was found to be 1.21kPa at 25 °C. Calculate the molar mass of the polystyrene.arrow_forwardExplain the principle behind vacuum distillation.arrow_forward2. A spherical metallic nanoparticle of diameter di = 100 nm melts at Tmi = 900 K. A smaller spherical nanoparticle of the same metal, of diameter dz = 50 nm, melts at Tm2 = 800 K. a) Explain why the smaller nanoparticle melts at a lower temperature. b) Calculate the melting point of the metal in bulk form.arrow_forward
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