After preparing the column, why should the silica get never to dry?

Q: Why does the amount of the dinitration increase at high temperatures?

A: At higher temperatures there is a greater chance of getting more than one nitro group substituted…

Q: What complications would a dried-out column (solvent level is below the top of the silica) introduce…

A: Answer

Q: Need to find percent recovery of crude caffine and purified caffine

A: Given that -  Mass of Caffeine in tea bags = 550 mg  Mass of Crude Caffeine = 109 mg  Mass of…

Q: Enumerate three properties of a good extracting solvent in liquid-liquid extraction.

A: Liquid-liquid extraction is a technique of separation of desired constituents from a solution by the…

Q: Why is the froth flotation method selected for the concentration of sulphide ores?

A: Froth floatation process: This process helps to remove gangue from sulphide ores. The principle…

Q: As an analyst, you were asked to determine the Ca content of the dolomite samples from Manila Bay…

A: Gravimetry analysis is a method of quantitative chemical analysis In this method  the species which…

Q: When setting up a column, what is the reason for adding a layer of sand on top of the adsorbent…

A: Column chromatography is a technique that separates substances based on differential adsorption of…

Q: What is the purpose of the bead inside the thoma diluting pipette?

A: There are two types of bead (glass bead): 1. Red in colour in RBC pipette 2. White bead in WBC…

Q: What type of ores can be concentrated by magnetic separation method?

A: The magnetic separation process is used when either the ore particles or the gangue connected with…

Q: How is lake test for aluminium ion based upon adsorption?

A: The lake test for aluminium ion is done based upon adsorption by litmus paper testing. Al2O3.nH2O…

Q: Mobile phase is: Select one: O a. Silica gel O b. Liquid phase O c. Solid phase ilica gel must not b

A: In chromatography mobile phase is a solvent or eluent which help the particles of mixture to move.

Q: Copper matte is charged into a silica lined converter in extraction of copper. What is the role of…

A: Copper matte is the mixture of Cu2S and little amount of FeS.

Q: How does the hydride generation method of sample introduction improve the sensitivity of some…

A: Hydride generation is an analytical technique that is very effective to separate hydride-forming…

Q: the reduction process of hematite in the blast fumace starting from coke to

A: In this question we have to explain the reduction process of hematite in the blast furnace starting…

Q: What is cross linking, give how does it effect recycling ability and strength of a polymer,

A: This is a question from polymer chemistry.

Q: why did you not need to accurately weigh out ki used in the standard and unknown analysis for…

A: In iodometric analysis of copper , generally KI is used because of following reasons (a)It is…

Q: Post-lab Questions: does this say about the purity of your solid?

A: Answer of 1st question as per guidelines can only answer 1 if you want to ask more send them one by…

Q: In thin-layer chromatography on silica gel TLC plates, which of these is true? a. More polar…

A:

Q: Discuss extraction process using soxhlet apparatus.

A: The solid-liquid extraction is done by the sohxlet extractor. The main purpose of this extractor is…

Q: Give equations and explanation for Brown Anson analysis

A: In electrochemistry, there are two major categories of cell reactions. In the first category, the…

Q: What types of metals are usually purified by the method of zone refining? Give an example.

A: Metals are lustrous elements. They are good conductors of heat and electricity. They are malleable (…

Q: Write the dispersed phase and dispersion medium of paints.

A: Colloidal solution contains two phase: dispersed phase and dispersion medium.

Q: The waste liquid solution that forms from the flux and gangue is usually a silicate. True or false?…

A: Given statement: The waste liquid solution that forms from the flux and gangue is usually silicate.…

Q: Give the reason why soot is present in the flame if the air holes are closed and absent if they are…

A: Answer - According to the question -   Soot is generally formed as an unwanted by-product of…

Q: What do you think is a limitation of the flame test in identifying metal ions in solution?

A:

Q: What happens if the solvent concentration falls below that of the silica stationary phase? What is…

A: The chromatography technique consists of two phases mobile and stationary phase .Mobile phase is the…

Q: Why is a filter paper preferred over a sintered glass filter?

A: Filtered paper is made up of fiber and there are numerous holes (obviously of microscopic size) in…

Q: Explain in detail about the X-ray diffraction analytical method with suitable example.

A: X-rays are the types of electromagnetic radiation with a short wavelength which is produced by –…

Q: What is the best procedure for phosphorus extraction from biochar by organic acids?

A: Biochar is defined as charcoal generated by biomass pyrolysis, however is used as a soil improver…

Q: crucible and precipitate are dry?

A: For precipitate are dry:                        Pour the methanol into the crucible ,swirl gently ,…

Q: What is the function of collectors in the froth floatation process for the concentration of ores?

A: Various processes are used for extraction of minerals. These minerals are very useful for…

Q: If fine sand were an impurity in a sample, how would it effect the melting point? What would make…

A: Melting point of a substance is the temperature at which  its solid phase and vapour phase exists in…

Q: Compare the column material of GC and LC in terms of the “functional groups” taking place on the…

A: In GC there are two type of coloumn.packed coloumn And capillary Coloumn. In gas liquid…

Q: What is the safety precaution associated with handling the crucible, clay triangle, and tripod.? At…

A: A clay triangle is a piece of laboratory apparatus that is used to support a crucible being heated…

Q: Why must the sodium stannite which is used in the identification of bismuth be prepared just prior…

A: In the identification, a stepwise procedure is followed to detect a particular element.

Q: In a GC experiment, a 30.00 m long fused silica capillary column produced 150,000 theoretical…

A: Calculate the plate height for the given problem which contains number of plates, length and height…

Q: Why are most of the ash-content determinations performed using dull red heat?

A: Ash content implies incombustible components remains  after heating the sample in furnace. Generally…

Q: How is matrix selected in soft ionization? Give examples.

A: In mass spectrometry soft ionization techniques are used to observe and analyse mainly the molecular…

Q: Briefly explain the objectives of debarking, chipping, bleaching and beating steps in papermaking.

A: Papermaking industry utilizes various chemicals for paper manufacturing. These chemicals alter the…

Q: the stationary phase used in the given setup is silica, which is more polar between A or B?

A: Given is chromatographic colum and this process is used to seprate two or more components.

Q: What is the role of a depressant in Froth Floatation process for the concentration of a sulphide…

A:

Q: Give and explain two precautions in brine solution experiment.

A: Brine solution also known as Sodium Chloride Solution. While doing any experiment involving to brine…

Refining of Crude Metal

Metallurgy could be defined as a technique by which metals can be extracted in their pure nature. Extractive metallurgy directs with the route of eradicating the valuable metals from ores and purifying the extracted metals to pure nature. In hydrometallurgy, the metal extraction’s from their ores is done using an aqueous solution. In the pyrometallurgical process, high temperatures are employed to initiate the reactions between gases, molten metals, and solids. In electrometallurgy, the technique is carried in an electrolytic cell.