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Why should a TLC plate be removed fromthe solvent before the solventfront reaches the top of the plate?
Removing the TLC plate before the solvent front reaches the top of the plate helps prevent the sample from oversaturating and distorting the spots. It also ensures that the solvent does not evaporate completely, which could cause the stationary phase to dry out and affect separation results.
How can water and carbon dioxade be removed from the air before the gases enter the fractionating column?
Water and carbon dioxide can be removed from the air using a pre-treatment process like dehydration and scrubbing. Dehydration removes water using adsorption or cooling techniques, while scrubbing involves passing the air through a solvent to absorb carbon dioxide. These steps help ensure that only the desired compounds enter the fractionating column.
What is the concentration of a solution expressed in moles of solute per 1000grams of solvent?
This concentration is known as molality, and it is expressed as moles of solute per kilogram of solvent. To convert from moles of solute per 1000 grams of solvent to molality, you need to convert the mass of the solvent from grams to kilograms before calculating the molality.
Why do people crush solids before putting them into a solvent?
People crush solids before dissolving them in a solvent to increase the surface area exposed to the solvent, which enhances the dissolution rate. A larger surface area allows the solvent molecules to interact more effectively with the solid particles, facilitating faster and more complete dissolution. Additionally, crushing can help achieve a more uniform particle size, promoting consistent mixing and solubility.
Why is it important that the sample spots are not below the solvent level when the filter paper is first placed in the developing chamber?
By placing the spot above the level of the solvent in the beaker, you slow the flow of solvent which results in improved separation of the components in the spot. If you placed it below the level of the solvent in the beaker, the solvent would just flow at a much faster rate and instead of separating the components in the spot, they would simply be washed away.
Why does carotene travel farthest in chromatography of leaf pigments?
Carotene travels the farthest in chromatography of leaf pigments because it is the least soluble in the chromatography solvent. This means it interacts less with the solvent and more with the chromatography paper, allowing it to move further up the paper before the solvent front stops it.
Why should a TLC plate be removed fromthe solvent before the solventfront reaches the top of the plate?
Removing the TLC plate before the solvent front reaches the top of the plate helps prevent the sample from oversaturating and distorting the spots. It also ensures that the solvent does not evaporate completely, which could cause the stationary phase to dry out and affect separation results.
How can I effectively remove sap from wood before painting it?
To effectively remove sap from wood before painting it, you can use a solvent like mineral spirits or rubbing alcohol to dissolve the sap. Apply the solvent to a clean cloth and gently rub the affected area until the sap is removed. Make sure to thoroughly clean the wood surface with soap and water afterwards to remove any residue before painting.
Why is it important to stop the chromatograph before the solvent reaches the top of the paper?
if it wouldn't be above the level of solvent the spots will run off
Why do we crush solids before putting them into a solvent?
Crushing solids before putting them into a solvent increases the surface area of the solid particles in contact with the solvent. This allows for better and faster dissolution of the solid into the solvent, leading to more efficient extraction of compounds or dissolution of substances.
How do you make a sentence out of solvent?
Always test the solvent on a small hidden place on the garment before applying it to the stain. A man who is not financially solvent should not ask a woman to marry him.
What solvent can remove rust stain?
One effective solvent for removing rust stains is white vinegar. Simply soak a cloth in vinegar and place it over the rust stain. Let it sit for a few hours before scrubbing the area with a brush or cloth. Repeat as needed until the rust stain is removed.
Why must you record both the solute and solvent when discussing solubility?
You want to be able to know what solute and what solvent you are using before you start talking about a solubility.
Why do we crush solids before putting them into solvent?
to increase the surface area of the solute
What harmful waste material leaves the blood and travels through the lungs before leaving your body?
Carbon dioxide leaves the blood and travels through the lungs before leaving your body.
Why are blogs being removed from the internet?
They are not being removed! There are more now then ever before.
Will mineral spirits melt plastic when used as a solvent?
Yes, mineral spirits can melt certain types of plastic when used as a solvent. It is important to check the compatibility of the plastic with mineral spirits before using it as a solvent to avoid damage.
