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Questions tagged [filtering]

Filtering is a process in which chemicals are being separated using their different state of matter.

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What are the practicle differences between gas and liqid microfilters?

In terms of very fine particle filters (pore sizes at about 0.2 micron), there seem to be some filters marketed/labeled to be for "air" (hence gases) and others for syringes (hence liquids) example ...
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42 views

How to effectively wash the precipitate or crystals on the filter and why?

My lab manual says that the precipitation on filter should be washed with a few small portions of the washing liquid. Why can't I just completely fill the filter funnel with the solvent instead of ...
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How to test a carbon filter?

Fake HEPA filters are easy to spot using DIY PM sensor and DIY Air Purifier (we just need to turn the fan ON, place the sensor's tube in front of it, and read the data). But what about carbon filters?...
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29 views

Removing water/moisture from car exhaust [closed]

I know that car exhaust is almost entirely nitrogen, water and carbon dioxide. How would I go about removing the water? Would I have to condense it off? Any devices already exist for doing so?
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2answers
343 views

Benefits of a Buchner funnel w/ a fritted disc instead of Quantitative Filter Paper Circles

I was wondering if someone could enlighten me on some example us cases where one would be better of using a Buchner funnel with a fritted disc (example), as opposed to a Buchner "style" filter (...
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1answer
25 views

Can activated charcoal be used to filter bacteria out of air? [closed]

As the title says: Can activated charcoal be used to filter bacteria out of air and or gas?
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18 views

How to control pore size of earthenware?

We are a group of students who are making a cheap water purifier filter. We are set to use earthenware in the process. Now some pores are big, some are small and I guess they are not evenly ...
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134 views

Why is recrystallisation used when filtration appears to be a better option?

Recrystallization: A solid containing the desired product and impurities are dissolved in a heated solvent. The reason this method works is because since the concentration of the desired product is ...
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1k views

How to filter out sulfur dioxide [closed]

Lets say I have a container that contains a mixture of air and sulfur dioxide. I want to be able to filter out the sulfur dioxide from the air, how can I do this either through the form of a filter or ...
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164 views

Filtering water vapour out of air at 0.1 bar options?

I will be conducting an experiment which as a byproduct will release some water vapour in a small pressure chamber. Water vapour can destroy the peristaltic pump and the air needs to be filtered ...
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80 views

Filtering fine particles before work-up (Tosylation)

I am trying on doing tosylation of PEG using Tosyl Chloride with pyridine. Some articles mentioned about filtering fine particles (pyridinium salts?) after diluting with DCM. But they did it with some ...
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434 views

How to separate two or more gases into different containers

I know this is probably an incredibly stupid question, but I'm making a hydrogen generator for a project. The basis of it is electrolysis of baking soda and water, which apparently gives off hydrogen, ...
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What are some viable methods of air removal in low pressure liquid chromatography systems?

I am very new to the field of chromatography, and have a very limited background in chemistry or chemical engineering. I am currently conducting my own research on methods of removal of air bubbles ...
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3answers
2k views

How are N95 masks different from dust masks?

There is a fire raging through my hometown right now. People in the area are advised to be wearing N95 masks to filter out smoke and particulates; and there is misinformation being spread that these ...
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76 views

Vacuum filtration: will Polymer elements interfere with the vacuum?

I am doing an experiment with vacuum filtration, where a Nylon filter is used to create a membrane (marked in pink in the picture attached). When I use the membrane, it frequently breaks in the ...
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2answers
705 views

How can I filter dissolved PVA from water

I'm working with a 3D printer that uses PVA filament as a support material. After a 3D printed part is made, it is put in water for some time to dissolve away the PVA supports. I'm trying to speed ...
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555 views

Can ethyl alcohol fumes be suppressed by a household air purifier/filter?

Can ethyl alcohol fumes be suppressed by a household air purifier/filter? In general, how are the fumes suppressed? How is it done? Can somebody direct me to some information regarding this? I've ...
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1answer
111 views

is there a filter to seperate glycerol and biodiesel?

i am currently working on a project of manufacturing biodiesel from cooking oils by the process "TRANSESTERIFICATION". at the end of this reaction, after the reaction mixture settles I have two layers ...
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3k views

Filtration methods at removing ions present in water

I'm doing a lab where I have to first find out what ions are present in the water (easy part). The next part is to filter out those ions from the water. Here are some methods that are stated on the ...
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4k views

Possible sources of error in gravitational filtration of precipitate

I've recently done a lab in which I combined 50.00mL of 0.452M iron (III) chloride and 50.00mL of 0.54M sodium carbonate. The balanced chemical equation is as follows for the reaction: 2$\ce{FeCl3}$...
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756 views

Solution not passing through filter paper

Is there any reason why a mixture of 2 immiscible solutions, when filtered, separate so that one passes through the filter paper and the other doesn't? I thought that only solids won't pass through ...
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1answer
316 views

Find the molarity of the filtrate

I can't figure out this stoichiometry question! 10.0 mL of 1.15M copper(II) nitrate reacted with 20.0 mL of .85M ammonium hydroxide. The solution is filtered. Determine the molarity of the filtrate. ...
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207 views

Activated carbon filter vs. Reverse osmosis filter

I have a 5 month old baby and I'm currently using an activated carbon water filter with the city tapwater supply (I live in Mumbai, India and the water can be highly polluted sometimes with all sorts ...
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What is the difference between carbon and charcoal filters?

I'm confused about the difference between carbon and charcoal filters. Ultimately, charcoal contains carbon but I have come across an exam question that asks for their individual roles in a water ...
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86 views

What would you recommend to isolate these compounds from cooking oil?

Recycled cooking oil, aka "gutter oil", is a major problem in countries such as China. I am doing some research to see if there's a reliable and quick way to determine if something is gutter oil. I ...
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1answer
76 views

To what degree an N99 active coal filter can protect against products of burning paraffin oil?

I sometimes do firedance and a part of it is waving a stick with burning endings made of Kevlar soaked in paraffin oil. I started to be a bit concerned about how healthy is it to inhale lot of ...
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1answer
103 views

Particle size of oxides of nitrogen and sulfur pollutants and HEPA filters

I am thinking about buying air purifier as pollution is high in my city. Going through the specifications of HEPA filters, I found that they block particulate matter of 2.5. PM 2.5 contains dust and ...
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0answers
82 views

Do filter-specific dyes exist? Equivalently, do dye-specific filters exist?

Apologies if this isn't chemistry enough for chemistry.se. I'm happy to go elsewhere if there are suggestions. Blue + Red = Purple is arbitrary here. If any different colors might make this more ...
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1answer
319 views

Does Reverse Osmosis remove elemental ions from water?

From what I understand, RO is able to remove (or at least considerably reduce) the salts dissolved in water. But thinking about it just doesn't make sense. RO works by filtering the solution using a ...
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1answer
3k views

Separation of 2 compounds ( Powder )

Suppose I have a mixture of 2 pure binary compounds, a white powder. What is the best method to separate the 2 compounds? What I have thought of so far is to dissolve powder in DI water and carry ...
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1answer
5k views

Cleaning an overhead water tank using Alum or other chemicals?

Alum is generally used in water tanks to settle down solid impurities. Since it contains aluminium I suspect it to be toxic to humans. So are there any safe chemicals to clean large overhead tanks ...
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1answer
80 views

Water softener and RO filter

I have a water softener for showers and dishwasher and a reverse osmosis filter for drinking water. For convenience of the install, the RO filter is using softened water (some calcium carbonate has ...
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2answers
126 views

How to reduce the turbidity of a water sample? [closed]

A task requires us to experiment water quality. How would you reduce turbidity of a clay water sample with an effective and cost-effective method?
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1answer
2k views

How to remove nitrate from water sample?

Are there any simple methods to completely remove nitrate ions from few ml of impure water sample? One method I am curious about is the following process: Add one or more reagents to water in test ...
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2answers
3k views

Separating citric acid from sugar

I'm trying to get as pure citric acid as possible from a mandarin. It's not because I desperately need citric acid, but because I want to achieve this. I started by grating the mandarine and ...
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3answers
17k views

Homemade filter paper

I used normal paper from my notebook to perform filtration. The filtration is 100% perfect, but takes incredibly long to happen, because the paper is too dense. I'm not planning to buy filtration ...
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1answer
5k views

Yellow-amber debris above water filter: What is it?

I have some weird, yellow-amberish pebbles that have been filtered by my Zero waterfilter. Any idea what they are? Copper maybe? The black stuff is charcoal from the filter. The quality of the water ...
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3answers
7k views

Diamond filtering - is it real or bogus?

I always hear that some big corporations use "diamond dust" to filter water seven times to make "diamond clear" vodka. I tried googling something about using diamonds for filtering, but I could not ...
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1answer
16k views

Remove formalin from food using chemical found in kitchen

In some parts of the world food is stored with formalin so it looks fresh forever! This is astonishing, but true (See refs here). As formalin is very bad for health and damages kidneys and liver very ...
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255 views

Negative retention for chloride in hydrolysate filtration

I tried to fractionate proteins as a function of their size with an ultrafiltration membrane. I observed a higher concentration of chloride in my permeate than in my feed or retentate. The proteins do ...
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10k views

Why does activated carbon preferentially adsorb anions?

Brands like Brita and Pur (in the U.S.) have made a name for themselves for the ability of their product (essentially a large-pore filter with activated carbon/charcoal) to extract the added chlorine ...