Why should the burette not be completely emptied when dispensing?

Q: are the lab instructions for performing the experiment. Even though ou will not be doing the…

A: The parts per million methods are one of the many ways to represent the concentration of a solution,…

Q: Explain different ways to induce recrystallization.

A: Recrystallization is a process in which the previously formed crystal were dissolved in a suitable…

Q: Once you choose the appropriate solvent, how much solvent should you add to your sample to dissolve?…

A: A solution can be defined as the mixture that consists of two components; solute and solvent. Here…

Q: Will recrystallization work as a purification technique on all samples? If the sample contained more…

A: Recrystallization techniques works only on the solid samples which is used to purify them. This…

Q: When using a 50 mL volumetric flask, approximately what volume of solution should be used for each…

A: It is asked about the volume of solution used in volumetric flask to rinse .

Q: 4. Why is important to allow the saturated solution to cool down slowly during the…

A: Recrystallization is purification method. Solid substances are purified using Recrystallization…

Q: Preparation of Ascorbic Acid Stock Solution and Dilution.    Problem: Determine the amount of 500…

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Q: explain the mechanism of cleansing action of soap.

A: Soap consists of hydrocarbon tail and head in which tail is hydrophobic (water repelling) and head…

Q: In the melting point determination, if the solud is impure, how will it affect the melting point?

A: There are basically 3 state of materials such as solid, liquid and gas. In solis atoms are tightly…

Q: Ratio of peppermint water to make 60ml? What is the stepwise procedure for preparation of…

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Q: 8. Why should you boil the sample solution right before reaching the end point?

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Q: If you choose a serial dilution—what would you do?  Assume that you begin with a 1.0 M solution.…

A: 50% serial dilution translates to,1/50 dilution factordilution factor = initial volumefinal volume =…

Q: Make a schematic diagram of the recrystallization procedure.

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Q: SHOW COMPLETE HANDWRITTEN SOLUTION

A: We have to Determine the values for a 0.020 m (NH4)2CrO4 solution. i) Ionic strength, I (in…

Q: effective

A: Key points of the video: Turbidity (Clarity of liquid) is measured in JTU from 0 to 100 where 0 JTU…

Q: What are some advantages of the membrane filter technique in the analysis of a water sample? Some…

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Q: Show complete solution:

A: Given that :

Q: At what step during the recrystallization would a soluble impurity be removed

A: Recrystallization :  It is a method in which solids are purified on the basis of their different…

Q: Give at least five factors to consider when performing chromatography (paper, thin-layer, liquid,…

A: Chromatography is a technique that is used for the separation of components of a mixture.  The…

Q: What was the concentration of my stock solution if I used 26mL of it to make 116ml of a 1.5 M…

A: Given that, V1= 26 mL , M1=? V2=116 mL , M2= 1.5 M

Q: When would it be preferable to use a plastic volumetric flask instead of a glass flask?

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Q: What effect would the incomplete drying of a sample (e.g., the incomplete removal of a…

A: The melting point will be lowered and broadened.

Q: Show complete solution

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Q: State the purpose of impregnating the filter paper with colloidion solution.

A: The pore size of ordinary filter paper is higher than that of colloidal particle. Hence the ordinary…

Q: A top-loading weighs to + 0.5 g. How many mg is that?  Please showe step by step solution

A: Since we know that,  1 g = 1000 mg  Given, weight = 0.5 g

Q: In distillation 1. What is the reason for discouraging the formation of bubbles inside the…

A: Distillation is a method of separating components present in a liquid mixture based on difference in…

Q: molecules are

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Q: Why would it be possible to get less than 100% recovery for a recrystallization?

A: The question is based on the concept of recrystallization. recrystallization is a purification…

Q: What lab equipment is used to manually stir solutions? thermomoter

A: In chemical laboratory various equipments are used these equipments are called apparatus  In any…

Q: Weigh out accurately 9.99 g of copper(II) sulfate pentahydrate (CuSO4·5H2O) by taring using a clean…

A: A numerical problem based on quantitative analysis, which is to be accomplished.

Q: what does running a “Dry Reflux” mean? What modifications would you have to make to your reflux…

A: The reaction carried out dry condition with moisture that is called as dry reflex reaction.

Q: What is the procedure of Labxchange Simulation Micropipetting Solutions? Or simply what are the…

A: Micropipettes are the adjustable and precision instruments used to transfer the volumes of the…

Q: Ter solution differ from an unbuffered solution

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Q: What will be the soufflé’s volume after cooking? Show complete solution

A: The pressure of the soufflé’s batter remains same and we need to relate the volume change of gas…

Q: The distribution coefficient between methylene chloride and water for solute Y is 15.  An amount of…

A: Distribution coefficient simply denotes how a compound is distributed in a mixture of two immiscible…

Q: Which is the most appropriate way to dispense liquid using a dropper (vertical, 45° angle, or…

A: Dropper is a device used to transfer small quantities of liquids.

Q: Explain the fuctions of each part of the reflux set-up

A: Reflux setup consist of three parts -- 1) A heating system 2) a round flask 3) a condenser.  It is a…

Q: Which oil - olive oil or coconut oil - would you expect to have a higher peroxide value after…

A: The peroxide value indicates the amount of peroxide generated in an oil sample by exposure to…

Q: Which among the following glassware is the most accurately calibrated and is ideal for solution…

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Q: What roles do solvent, density and polarity play in liquid/liquid extraction

A: i. Solvent =  In liquid - liquid extraction, the solvent which is needed to be extracted should not…

Q: To identify 1° alcohol from 2° alcohol and 2° alcohol from 3° alcohol giving Immiscible layer as the…

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Q: Give the rule in reading the meniscus when measuring colored and colorless solutions.

A: The rule in reading  the meniscus when measuring colored and colorless solution is given below.

Q: An overachieving student determines that their neutral liquid unknown contains impurities. Suggest…

A: The unknown solution contains liquid and impurities.

Q: write a stp by step procedure for the preperation of 500 mL of 0.350 M LiNO3 solution.

A: Since molar mass of LiNO3 = 69 g/mol And moles of LiNO3 = molarity X volume of solution in L Since…

Q: As a stabilizer for solutions of ascorbic acid for injection use: A) sodium bicarbonate B)…

A: Sodium metabisulphite  is used to stabilize the ascorbic acid for the stabilization.  Sodium…

Q: Why might it be necessary to employ procedures such as the use dilution and in-use tests?

A: Step :1  A use dilution test is the another method for testing the efficacy of the disinfectant.In…

Q: Describe the procedure of how to collect and dry your newly recrystallized compound.

A: Recrystallization is the method that is used to purify the organic compounds. It involves the…

Q: Identification Complete each statement. Write your answer at the end of each question. 92. To…

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