a)
Interpretation: Melting points of pure Q and R should be determined.
Concept introduction: Melting point is the temperature that involves the conversion of a substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
b)
Interpretation: Melting point and composition of eutectic mixture should be determined.
Concept introduction: Melting point is the temperature that involves the conversion of a substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
Eutectic mixture is composed of two or more than two non-interactive components to make new compounds but prevents the crystallization process of each other. This results in the formation of a system with melting points less than each of the two components.
c)
Interpretation: Whether mixture of
Concept introduction: Melting point is the temperature that involves the conversion of a substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
d)
Interpretation: Prediction about composition of mixture of Q and R if it melts at
Concept introduction: Melting point is the temperature that involves the conversion of a substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
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Chapter 3 Solutions
EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- How could the data in Table 13.2 be used to predict the solubility in water of 1-octanol or 1-decanol? Table 13.2 Solubilities of Alcohols in Water, 20°Carrow_forward6. Suppose you have a mixture of water and your 2-bromo-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-bromo-2-methylbutane (organic phase) b. water (aqueous phase) c. there would only be one phase since the substances are misciblearrow_forwardOne of these is not a property of a desirable solvent for crystallization. O a. it must dissolve the solute only sparingly at a lower temperature. O b. it must react chemically with the solute. O c. it must be able to dissolve the solute at an elevated temperature. O d. it must sufficiently be volatile so that it may be removed easily from the purified crystals. A soap molecule has a polar head and a nonpolar tail while a detergent has none but a nonpolar moiety. (moiety means part or portion of a molecule) Select one: O True O Falsearrow_forward
- 12. Answer Only Refer to the following mixtures: Mixture A: Liquid and solid mixture Mixture B. Liquid mixture whose boiling points are similar. Mixture C. Liquid mixture with high boiling point. Mixture D. Heat sensitive liquid mixture. Which of the following distillation can be applied for Mixture D? vacuum distillation fractional distillation simple distillation none of these ———— This is defined as the temperature at which the vapor pressure of the liquid phase of a compound equals the external pressure acting on the surface of the liquid. solubility melting point boiling point flash point optical rotation —————— Predict the color change if 1% ferric chloride (yellowish solution) is added to a test tube containing a mixture of ethanol and pure acetyl salicylic acid. purple to yellow yellow to dark blue light blue to pink yellow to purple no color changearrow_forward2. The solubility of NaCl is 35.7g NaCl/100g of water at 0oC. What would you expect the solubility for NaCl to be when the water is warmed to 25oC? a. a value greater than 35.7g/100g H2O b. a value less than 35.7g/100g H2O c. the solubility would remain at 35.7g/100g H2Oarrow_forwardWhen 2.50 g of biphenyl (C12H10) is dissolved in 20 g liquid solvent, the boiling point increases by 0.785°C. What is the Kb of the liquid solvent in K/molal? A. 0.967 B. 1.53 C. 2.80 D. 3.06arrow_forward
- A 5.00 g of an organic solid is dissolved in 100.0 g of benzene. The boiling temperature of this solution is 82.42 °C. The organic compound is 15.72% nitrogen, 7.92% hydrogen, 35.92% oxygen and the remainder is carbon. The boiling temperature of pure benzene is 80.1 °C; Kb = 2.53 °C-kg/mol. a. Determine the molecular weight of the organic solid. b. Determine the molecular formula of the solid c. Determine the mole fraction of the organic solid in the solution d. If the density of this solution is 0.8989 g/mL , calculate the molarity of the solutionarrow_forwardWe utilise the phrase "like dissolves like" when choosing the correct solvent for the recrystallization technique. Which of the following sentences accurately describes this principle? A. two compounds with the same type and strength of intermolecular forces will likely dissolve in each other B. two substances with the same type of intermolecular forces but of different magnitude are likely to dissolve in each other C. two substances that contain in their structure the same skeleton, but different functional groups are likely to dissolve in each other. D. options B and C E. options A and Barrow_forward5- A chemist is given a nonelectrolyte white powder for analysis. 38.7 g of this substance is dissolved in 100.0 g of water. It is determined that the resulting solution freezes at -4.0°C. Additionally, the elemental composition of the substance is identified and found to be 40.0% C, 6.7% H and 53.3 % O by mass. Find the molecular formula of this unknown white powder using these experimental evidences (Kş of water: 1.86°C/m, C: 12 g/mol, H: 1 g/mol, O: 16 g/mol).arrow_forward
- 3. The following graph of the fractional distillation is the mixture (mol/mol ratio) of ethanol-water. Answer the following questions based on the graph. a. What are the normal boiling points of ethanol and water? b. At 95°C, what is the composition in the vapor? What is the composition in liquid? c. For a mixture comprised of 50mol% ethanol and 50% water: i) at what temperature will the mixture begin to boil? ii) When the mixture begins to boil, what is the mole % ethanol in the vapor? iii) What is the boiling point of the liquid formed by condensation of the vapor from (ii) above? d. A mixture of ethanol and water of unknown molar ration is heated to boiling. Immediately, after boiling commences, a sample of the vapor is found to contain a 0.3 mole fraction of ethanol. What is the composition in mol % of the original binary mixture and what is its boiling point? e. What is the mole % of ethanol of Azrotropic Point? At is the boiling point at the azeotropic point? 3741 372 370 368…arrow_forwardIt is found that the boiling point of a binary solution of A and B with XA = 0.6589 is 88 °C. At this temperature the vapor pressure of pure A and B are 127.6 kPa and 50.60 kPa, respectively. Calculate the total pressure. A. 117.3 kPa B. 116.8 kPa C. 118.0 kPa D.0.717 kPa E. 0.385 kPaarrow_forwardWhich statement is NOT correct for an azeotropic mixture of two volatile liquids? O a. These two liquids can be fully separated by fractional distillation O b. At the azeotropic ratio, the composition of the liquid is the same as the composition of the vapor above the liquid Azeotropic composition refers to a specific ratio of the two components c. O d. Propanol and water can form an azeotropic mixture O e. All answers are correctarrow_forward
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