In the process of a recrystallization, if crystals do not form upon cooling the solution, it is often recommended that the inside of the flask be scratched with a glass stirring rod. What purpose does this serve, and how does it work?

Q: 9. In which solvent is iodine more soluble? Give experimental evidence that supports your answer.

A: Non-polar solvent diethyl ether should be the best solvent for iodine

Q: How does shaking or stirring affect dissolving?

A: How does stirring affect the dissolving has to be given.

Q: calculated

A: Part 1: We know that molarity is defined as the number of moles of solute present in per liter of…

Q: Describe how to prepare 100.00ml of a 0.250M sodium chloride solution using sodium chloride powder.

A: Volume of solution = 100 mL OR 0.1 L

Q: 2.A student realizes they forgot to add boiling stones to their distilling flask. The solution is…

A: Boiling stones are used to prevent loss of product. it cannot allow the solvent spill over the flask…

Q: When performing recrystallization, it is imperative to cool the hot, supersaturated solution slowly.…

A: Recrystallization is a procedure of purifying the impure compound in a solvent. The main principle…

Q: Consider organic compound A that has Kether/water = 4.0.   Calculate how much of 10.0 g of A will…

A: Distribution coefficient: The ratio of the concentrations of a solute at equilibrium in two…

Q: of

A: This question is related to polymers.

Q: A sample contains a mixture of t-butanol and n-butanol. What type of distillation, simple or…

A: Fractional distillation procedure is more efficient in separating the mixture into its components.…

Q: Recrystallization and Melting Points When performing recrystallization, it is imperative to cool…

A:

Q: Why can't a mixture of water and diethyl ether be used for recrystallization?

A: Recrystallization is used to purify the solute that can be dissolved in the given suitable solvent…

Q: Why do almost no bubbles form inside the bottle of carbonated soda (ex. Sprite) when adequately…

A: We know that  solubility is inversely proportional to temperature. this means if  temperature is…

Q: hy do we have to measure the boiling point of distilled water during this experiment?

A: Given : We have to explain why we measure boiling point of distilled water.

Q: To prepare 500 mL of 6 ppm of aqueous ethylene glycol, we need . . dissolve in 500 mL

A: 1 ppm = 1 mg/ L 6 ppm = 6 mg/ L

Q: Commercial bleaching solutions commonly found on store shelves usually are labeled, "Contains at…

A: Temperature affects the bleach shelf life. Thats why the bleach is stored at somewhat less…

Q: Explain and answer properly in recrystallization, after the crystals have formed (with cooling on…

A: Recrystallization  This method is important for the purification of the non volatile organic…

Q: In order to obtain accurate data it is important to add hear slowly and steadily when the…

A: In order to obtain accurate data it is important to add heat slowly and steadily when the…

Q: 1. What is the effect of varying the amount of solvent on the electrical conductivity of solution?…

A: 1. The more concentrated a solution is, the higher the conductivity is. In most cases it is a…

Q: How can one calculate the new boiling and freezing points of a pure solvent after adding the solute?

A: When solute is added to a pure solvent, vapor pressure of pure solvent changes. Hence the boiling…

Q: Please show step-by-step solution.

A:

Q: Which of the following solvents is the best to use for recrystallization of Solute A? Hexane…

A: The recrystallization technique is generally used to purify of any compound in a proper solvent. The…

Q: cite literature that gravimetric analysis is used to test the purity of any soup product

A:

Q: What is the problem with using a solvent with a very high boiling point for recrystallization?

A:

Q: If crystallization does not occur even though the solution was thoroughly cooled..

A: Interpretation -  If crystallization does not occur even through the solution was thoroughly cooled…

Q: Why does the temperature not change while the pure cyclohexane is freezing? This question is based…

A: The molar mass of a solute can be determined by measuring the depression in the freezing point due…

Q: Assuming that hexane and water obey the required solubility criteria, why could they still not be…

A: To choose the best solvent for re-crystallization the compound should less soluble in cool solvent…

Q: Which one is the most common method used for the purification of liquid mixtures?

A: The mixture of liquid can be separated by different methods into pure liquids.

Q: Why must the flask be dry before it is heated in the hot water bath ?

A: Safety Precautions are crucial and must be followed during the course of the experiment. Caution…

Q: 4. A 1:1 mixture of ethyl acetate and ethyl butyrate can be efficiently separated by careful…

A: #Q.4: We have to separate a 1:1 mixture of ethyl acetate and ethyl butyrate. The boiling point of…

Q: How can the temperature and the vapour pressure in a fractional distillation be effectively…

A: Fractional distillation is a distillation process used to separate the liquid mixtures using…

Q: While performing a distillation to separate two liquids , a small fraction was collected at 70-73°C,…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Why is it important to perform a fractional distillation slowly? What happens if a fractional…

A: Fractional distillation

Q: What is the normal boiling point of this solvent?

A:

Q: 1. What is the use of boiling chips? 2. List at least 3 limitations of using distillation as a…

A: Hello. Since your question has multiple parts, we will solve first question for you. If you want…

Q: Why is flameless heating used for heating a solution in hexane or diethyl ether during a…

A: Answer: 1. This recrystallization technique is used to purify the chemicals. In recrystallization,…

Q: In the preparation of 1,200 mL of 70% alcohol from stock absolute alcohol solution, what is the…

A: Here we will consider v/v % concentration, i.e. 70 % alcohol solution implies out of 100 mL solution…

Q: How to prepare 1.10M of sodium thiosulphate

A: Given ,molarity of sodium thiosulphate is 1.10M

Q: Linalyl acetate is a component of essential oil of lavender. It is immiscible in water and exerts a…

A: The expression for ideal gas is shown below: PV = nRT Where; P = pressure V = volume n = moles of…

Q: In general terms, please describe how to carry out a recrystallization. Just give the steps that…

A: Recrystallization is a slow process by which a solid organic compound can be purified. In this…

Q: 1. What are the experimental uncertainties in preparing a stock solution? 2. What are the…

A: 1. Stock solution is prepared followed by a dilution or series of dilutions to arrive at a working…

Q: Question 1. a) You think that you have isolated a substance A in the lab. It melts at 75 – 77C.…

A: Melting point of a compound is the temperature at which its liquid state and vapour state are in…

Q: The solute in the liquid mixture can be separated from the liquid solvent. O Gas-liquid extraction…

A: We have to tell, how one can separate the solute in the liquid mixture from the liquid solvent. Now,…

Q: Explain the principle behind vacuum distillation.

A: Vacuum distillation is one of the processes that made industrial wastewater reusable. In this…

Q: Stirring a solid-liquid mixture has no effect on the rate at which a saturated solution forms.

A: Saturated solution is a type of solution in which no more solute can be dissolved in a given amount…

Q: 1. Assuming that sand and sodium chloride are the impurities in a sample of benzoic acid, state…

A: A mixture is a substance that is made up by mixing more than two compounds or substances together.…

Q: A student is trying to perform a single solvent recrystallization of compound X using methanol. He…

A: Ans.(i) Option (c) is right. No, you need a solvent which dissolves the sample only at boiling…

Q: if i want to dilute 30 L ofa 1.5 M FeSO4 solution to a 0.3 M FeSO4 solution how much of the solvent…

A: Initial volume = 30 L  Initial molarity = 1.5 M  New molarity = 0.3 M  New volume = ?

Q: Cooling Curve/ Freezing Point Determination The solution must be continuously stirred while heating…

A: The solution must be continuously stirred while heating and cooling it. What will happen if it's not…