MACROSCALE+MICRO.ORG...-OWLV2 ACCESS
7th Edition
ISBN: 9781305884175
Author: Williamson
Publisher: CENGAGE L
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Chapter 4, Problem 5Q
Interpretation Introduction
Interpretation:
The circumstances suitable for the use of a mixture of solvents to carry out recrystallization should be determined.
Concept introduction:
Recrystallization is a technique that is used to purify the impure compounds. It is based on the principle that the solubility of substances increases with the increase in temperature.
Following are some of the types of recrystallization:
- Single-solvent recrystallization
- Multi-solvent recrystallization
- Hot filtration-recrystallization
Expert Solution & Answer
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Students have asked these similar questions
2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible?
Group of answer choices
To minimize the amount of pure solid lost due to its solubility.
To minimize the cost of the recrystallization.
To reduce the time needed to filter the pure solid from the solvent after recrystallization.
To minimize the amount of hazardous materials used.
A standard solution is prepared by
diluting the stock solution and used
in chemical analysis for preparing
the standard curve.
Larutan piawai disediakan dengan
melakukan pencairan larutan stok
dan digunakan dalam analisis kimia
untuk penyediaan lengkuk piawai.
A) Illustrate how do you prepare a stock
solution of 0.01 g of NaNO2 in one liter
of distilled water in laboratory.
In a recrystallization experiment, describe a procedure to solve the following problem:
No crystals are formed when a solution reaches room temperature
Chapter 4 Solutions
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- A solution is made by dissolving 34.0 g of NaCl in 100 g of H2O at 0C. Based on the data in Table 8-1, should this solution be characterized as a. saturated or unsaturated b. dilute or concentratedarrow_forwardThe dispersed phase of a certain colloidal dispersion consists of spheres of diameter 1.0 102 nm. (a) What are the volume (V=43r2) and surface area (A = r2) of each sphere? (b) How many spheres are required to give a total volume of 1.0 cm3? What is the total surface area of these spheres in square meters?arrow_forwardPredict the relative solubility of each compound in the two solvents, based on the intermolecular attractions. (a) Is potassium iodide more soluble in water or in methylene chloride (CH2Cl2)? (b) Is toluene (C6H5CH3) more soluble in benzene (C6H6) or in water? (c) Is ethylene glycol (C2H4(OH)2) more soluble in hexane (C6H14) or in ethanol (C2H5OH)?arrow_forward
- Predict the relative solubility of each compound in the two solvents, on the basis of intermolecular attractions. (a) Is Br2 more soluble in water or in carbon tetrachloride? (b) Is CaCl2 more soluble in water or in benzene (C6H6)? (c) Is chloroform (CHCl3) more soluble in water or in diethyl ether [(C2H5)2O]? (d) Is ethylene glycol (HOCH2CH2OH) more soluble in water or in benzene (C6H6)?arrow_forwardYou have a solution that contains 4.0g of oxalic acid dissolved in 100ml of water. this solution is placed in a separatory funnel, and then 100ml of diethyl ether is added to the separatory funnel and an extraction is performed. (Diethyl ether and water are immiscible solvents.) Use the following constant to calculate how much oxalic acid is in each solvent after extraction. Solubility of Oxalic acid in water=9.5g/100ml Solubility of Oxalic acid in ether=16.9g/100mlarrow_forwardthe solubility of any organic material in a given solvent is due to the intermolecular forces present between the solvent and solute, hexanes (the alkanes isomers of C6H14) are rarely used for extraction purposes. What is a good reason for this experiment?arrow_forward
- Distinguish between dispersion methods and condensation methods for preparing colloidal systems.arrow_forwardWhat is the kinetic property observed in suspension? What is the optical property observed in solutions?arrow_forwardAn ideal solvent to use for recrystallization is one that: Group of answer choices dissolves the desired compound in ice-cold water temperature but does not dissolve the desired compound at its boiling temperature. a solvent in which the desired compound dissolves at any temperature. a solvent that reacts with the desired compound. dissolves the desired compound at its boiling temperature but does not dissolve the desired compound in ice-cold temperature.arrow_forward
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