It is usually recommended to clean the glass surfaces of a refractometer with ethanol or isopropyl alcohol rather than acetone or water. Why?

Q: What are the advantages and disadvantages of decreasing monochromator slit width?

A: Different types of spectroscopy can be used to identify the structure of unknown compound. Some…

Q: Which of the following is NOT a detector used with HPLC?

A: Light Scattering Detector:  Light scattering detection does not require analytes to have…

Q: ) The refractive index (μ) of water is found to have the values 12.9,12.5,12.3 and 11.8. Calculate…

A: The question is based on the concept of analytical treatment. we have been given refractive indices…

Q: What types of samples can be analyzed by IR? How are substances that are opaque (not transparent)…

A: IR spectroscopy is used for the characterization of solid,liquid, or gas samples. Material…

Q: What are the advantages of a dropping-mercury electrode in polarography? Why is polarography used…

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Q: Which technique is based on the stronger attractionsome components have for the stationary…

A: In chemistry, when a reaction is performed between the reactants, that just does not involve mixing…

Q: Explain how XPS can be used to identify the compositions of the material in the layers below the…

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Q: what are the causes of band spreading in chromatography

A: The answer is given below

Q: Which statement is true? Statement 1: Since tiny amounts of material are exposed on an open…

A: The answer of the above question is given in step 2

Q: Experiment: UV-Vis Spectrophotometry and Beer’s Law Absorption of Light of Dyes in Beverages…

A: Spectroscopy is basically a technique that study the interaction of matter with radiation  UV…

Q: Co-Perciptation

A: In this question we have to explain the following types of Co-Perciptation 1- Surface Adorption    2…

Q: explain the relationship between the refractice index of a mixture and the molar fractions of the…

A: The detailed solution of your question given below-- Since, we know that how to find mole fraction…

Q: Which of the following statements DOES NOT describe the real limitation of Beer's Law? The…

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Q: Can acetic acid be used as the mobile phase in  kool aid chromatography over isopropyl alcohol?…

A: Kool aid chromatography involves separation of red and blue dyes present in the Kool aid. The mobile…

Q: In thin layer chromatography (TLC), explain how the pigments separate on a piece of paper. 2. If…

A: To ensure that the colours separate into independent bands that do not overlap as they migrate up…

Q: As distillation method is used to seperate a homogenous mixture, which kind of mixtures…

A: Chromatography is a technique that is used for separating the components in a mixture. Separation is…

Q: You first separated the components of spinach and then identified them by TLC analysis. Was there a…

A: TLC of spinach means separation of chlorophyll pigment.The different form of chlorophyll found in…

Q: In general, we want to have absorptions less than or equal to 1.  Given that an ethanol solution of…

A: Given that: absorbance - 1 extinction coefficient (ε) = 23,150 length of light =  1.00 cm  To…

Q: Cite problems why t

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Q: Many ions form colored solutions when dissolved in water. For example, aqueous Cu2+ solutions are…

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Q: he result of a TLC experiment showed that Compound X has an Rf values of 0.25 on a silica plate…

A: Thin layer chromatography is a chromatographic technique that is used to separate the component in a…

Q: II B C D What is the design of figure Il? double beam spectrophotometer diode array…

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Q: In a simple distillation of a mixture of methanol (bp. 65°C and ethanol bp. 78°C), a fraction was…

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Q: Which of the following characteristics of a reversed – phase chromatography? I. The stationary…

A: In reversed-phase chromatography is a liquid chromatography technique that involves the separation…

Q: 1.A double beam UV-vis spectrophotometer accommodates the sample at the cell farther from the…

A: Hi, we are supposed to answer one question. To get the remaining questions solved please mention the…

Q: 10. In what ways can a refractive index be used to characterize a liquid sample? 11. Describe how to…

A: A question based on properties of liquids that is to be accomplished.

Q: This graph shows an absorbance vs concentration curve for Co2"(aq) solution. Sample Standard Curve…

A: The absorbance v/s concentration curve given is,

Q: Why are the application of TGA more limited than those for DSC?

A: TGA is one of the thermogravimetric techniques. In this process changes in chemical properties and…

Q: Which of the following statements DOES NOT describe the real limitation of Beer’s Law?     At the…

A: According to Beer Lambert law, the absorbance of a substance is directly proportional to path length…

Q: What major impact does reducing film thickness of stationary phase in a wall-coated capillary column…

A: The film thickness in capillary columns are decided based on the type of material to be analyzed.…

Q: The result of a TLC experiment showed that Compound X has an Rf values of 0.25 on a silica plate…

A: TLC is based on the principle of separation through adsorption type. The separation relies on the…

Q: 11. (8pts) how can silica gel Fsa TLC plates can be visualized ( give two methods? :

A: In the given question we have to visualise the F254 TLC plate, there are two method by which we can…

Q: For each of the following statements, answer TRUE or FALSE and explain your answer briefly.   It…

A: True Potassium Dichromate solutions (235 - 430 nm)The most widely recognised reference material for…

Q: In an experiment to measure the dipole moment of 1,2 dichlorobenzene, 1.603 g of this substance was…

A: Mole fraction = number of moles of the component / total number of moles of all the components…

Q: Choose the appropriate techniques for degassing the mobile phase of HPLC. I. Ultrasonic II. Boiling…

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Q: TGA analysis

A: Ans. Thermogravimetric analysis or TGA techniques helps in determination of thermal stability of…

Q: Please choose an appropriate technique(s) to separate following compounds (it can be one, more than…

A: We can see the difference in boiling point of both that is the Phenol and Toluene.

Q: Explain why TLC cannot be used for some volatile low molecular weight substances such as toluene.

A: Thin layer chromatography, a thin layer is pressed over the chromatographic plate. A drop or small…

Q: Briefly explain the principle behind the following techniques: (a) ion-exchange chromatography (b)…

A: Question is based on chromatography techniques:

Q: . What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied…

A: Sublimation is the process in which solid is directly converted in to a gas phase.

Q: Why is the monochromator not placed after the TCH lamp when performing an absorbance or…

A: Since the basis for the AAS process is atomic ABSORPTION, the monochromator seeks to only allow the…

Q: While performing absorbance measurements of standard solutions, Taranpreet used - 8 ml of solution…

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Q: More polar molecules move more slowly through silica than less polar molecules. Why is silica gel…

A: In methyl orange is polar since it contains the ionic part of the molecule (SO3-Na+). However, in…

Q: . Reversed phase HPLC refers to the condition of stationary phase and a mobile phase of separation.…

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Q: a 150 g. dried leaves sample of Ficus religiosa was subjected to ethanol extraction for 48 h, an…

A: The technique which is commonly used in laboratory for the separation of components of mixture is…