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

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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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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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Is underground water safe to drink after 0.01 micron filter? [closed]

I just buy a water filter: http://www.stiebel-eltron.co.za/water_filter_stream.html and it says it has: Ultrafiltration (UF Filter) Membrane Micro-porous 0.01 micron hollow fiber filter removes ...
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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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132 views

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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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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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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25 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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59 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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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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237 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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478 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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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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Water Quality Experiment [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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650 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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5k 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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277 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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323 views

Is there a household method to decolorize potentially contaminated water?

I am living in my dorms at the moment and apparently it is an accepted thing that the water in the building is brown and yellow. According to my RA, this is a characteristic of the town I live in. ...
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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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10k 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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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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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 ...