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Questions tagged [environmental-chemistry]

For questions regarding chemicals and chemical processes that act on and interact within environmental systems.

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1answer
83 views

How can methane absorb infrared light within wide range of frequency but CO2 can't?

Methane is one of the most potent greenhouse gases in Earth's atmosphere.I saw a lot of answers related to it but lacks de facto exegesis to it.
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0answers
15 views

Removing or hiding (white) magnesium carbonate residues on natural rock surfaces

As noted in this question, magnesium carbonate is often used by rock climbers to help mitigate the effect of sweating whilst climbing. While this is not a major issue on artificial walls, the residue ...
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2answers
44 views

Why doesn't natural gas combustion release only one-sixth as much carbon dioxide as coal burning?

Burning hydrogen releases a little more energy than burning carbon, correct? And methane is CH4, but coal is mostly C, correct? So shouldn't burning pure carbon release five times the CO2 (Assuming ...
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1answer
26 views

Solvents and Enzymes

I was reading recently about environmental remediation being done, using an esterase to break down / neutralize cocaine that had contaminated waterways in Europe. Are there similar enzymes that can be ...
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1answer
67 views

Removing PTFE marks on glass bottles after using magnetic stir bars

I am using magnetic stir bars to agitate solutions for 4 weeks at a time. I have noticed at the bottom of the glass bottles that white marks have accumulated where the stir bar spins. Even with ...
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0answers
16 views

Problem in terms of pC-pH plotting

I recently confronted a mission to plot a pC-pH graph('p' stands for the p-value notation, and 'C' stands for the concentration of a species), which meets the conditions below: Plot the pC-pH graph ...
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0answers
39 views

Mobility of Cations in the Environment

I have recently performed an experiment in which I tested the affects of phytotoxic cations on the rate of germination of the common navy bean. I did this out of curiosity, as I have recently been ...
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2answers
264 views

Calculate the concentration in milimoles per litre (mM) of a solution that is 20% H2SO4 by mass and that has a density of 1.198 g/L

Calculate the concentration in milimoles per litre ($\pu{mM}$) of a solution that is $\pu{20\%} \ce{H2SO4}$ by mass and that has a density of $\pu{1.198 g/L}$. For the answer, please provide two ...
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1answer
77 views

How dangerous is an industrial scale styrene spill?

A few years ago a cisterna truck full of styrene crushed on the road near a small town nearby, spilling 4 tons of the chemical. It apparently has caused a small ecological catastrophe killing fish in ...
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0answers
44 views

Is it environmental to throw ordinary keys in the regular household trash?

I have several keys on my chain that I do not need any more, so I'm thinking about throwing them away, but I'm not sure if it is okay to throw away in the regular household trash. I looked it up to ...
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0answers
51 views

Can hydrogen plasma reduce carbon dioxide?

There are several studies describing usage of hydrogen plasma to reduce metal oxides. This is not yet widely adopted in industry, but it is of interest for environmental reasons (such as desrcibed in ...
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0answers
29 views

Reaction of electromagnetic radiations with the air pollutants [closed]

My friends, who are working on an IoT based technology project, explained their idea to me which is roughly like reducing air pollution by converting pollutants to oxygen ($\ce{O2}$) in any reaction, ...
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1answer
103 views

Effect of rain on water and soil samples contaminated by petroleum [closed]

I am about to perform research on the impact of petroleum fire disaster on the soil and water sources within the region of disaster, using heavy metals and total petroleum hydrocarbons as impact ...
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1answer
256 views

Can Cl(g) cause quick rusting? [closed]

I'm actually digging in something that comes from Syria... How does Chlorine cause metal to get rusted? It's full of pictures of rockets (allegedly filled with chlorine gas) that are all rusted. In my ...
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1answer
221 views

how to control relative of Fe2+ and Fe3+ [closed]

hi how can I control relative of Fe2+ andFe3+ when we adding raw iron to acid solution To get the ratio 2:1
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1answer
1k views

What is K2O-nSiO2-xH2O?

In need of $\ce{K2SiO3}$ for my cucumber plants, I purchased a bag of potassium silicate. The molecular formula is $\ce{K2O-nSiO2-xH2O}$. Normally, my bags of fertilizer are easy to figure out. For ...
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2answers
374 views

DIY Brass Etching methods (safer etchants, waste, and disposal of)

I want to etch brass for making name plates etc. (Also for copper PCBs but brass is probably more complicated given the other metals). Several etchants commonly used, and I'm sure many more are ...
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0answers
46 views

How will a NPK 15-0-15 fertilizer affect this soil?

If the soil we have has pH 7,2 and we want to add this fertilizer which has 15-0-15 (NPK). What should the fertilizer contain in order for the pH to get reduced? I believe that $\ce{K+}$ ions should ...
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1answer
11k views

Difference in pH of water and rainwater

In my textbook (Olmsted and Williams 4th ed) it is given that pH of pure water is 7, pH of unpolluted rain water is between 5-6 and pH of acid rain is between 4-5. It is obvious that pH for acid ...
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0answers
34 views

(Why) is it difficult to liquidize the polluting exhaust of a vehicle? [closed]

Considering the hazardous effects of car and other vehicle exhaust when released into the atmosphere, I began wondering why we are not dominantly preventing the exhaust from entering into the ...
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2answers
677 views

Environmental effects of terephthalic acid [closed]

What are the effects of terephthalic acid on the environment? Especially oceans What would happen if the levels of terephthalic acid increased in the ocean? What would be a way to reduce the impact ...
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1answer
118 views

First Order Degradation Constant (λ)(d^-1)

Can you please tell me the First Order Degradation Constant (λ)($d^{-1}$) for 1,3,5-Trimethylbenzene (mesitylene)? If you don't have this value, can you please tell me which VOC in 35 Illinois ...
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1answer
904 views

How to calculate the solubility of lead (II) carbonate in water, given that bicarbonate will also form?

Calculate the solubility of lead (II) carbonate, $\ce{PbCO3}$, ($K_{\mathrm{sp}} = 1.5 \times 10^{-15}$) in water, given that carbonate is a stronger base than water, so will also form bicarbonate. ...
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0answers
381 views

Does iron in water become visible when being heated?

I'm using ground water to provide my daily needs: Laundry, bath, toilet, ... I don't use it as drinking water, but I do cook with it. What I noticed is that when using the water cold it appears as ...
5
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1answer
118 views

Degradation of sulfuryl fluoride SO2F2

Recently, the houses next to us were fumigated with "Vikane", which apparently is $\ce{SO2F2}$. To my surprise, the gas was just pumped out in the atmosphere without further ado at the end of the ...
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5answers
3k views

How 'heavy' should an element be, to be a “Heavy Metal”?

I've come across the term "Heavy metals" innumerable times in articles, mostly pertaining to environmental issues. Is there a weight range (of sorts) against which an element (metal) is classified as ...
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4answers
118 views

Why is atmospheric composition compared by volume?

The composition of the Earth's atmosphere by its constituent gases (nitrogen, oxygen, argon...), is often given by percent volume. (See this Wikipedia page, for example). Why are these compositions ...
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1answer
132 views

Breaking Down PCB's in lakes

I was wondering if there is any natural process which breaks down PCBs (Polychlorinated biphenyl). This is an extremely harmful contaminant that was pumped into various lakes by chemical plants up ...
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1answer
225 views

Release of sulfur dioxide from odored fuel gases

Often, fuel gases such as butane and natural gas (methane) are mixed with some foul-smelling impurities such as thiols (mercaptans) and hydrogen sulfide. Presumably, anything containing sulfur would ...
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1answer
131 views

What chemicals cause the softer, less-raw taste of purified water sold in bottles?

I've seen the post, "What defines an element's taste?", but it doesn't answer my question. I took water that is supplied by the municipality corporation and put it through a gravity based water ...
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1answer
79 views

Why might PM2.5 concentration increase or stay the same when SO2 is reduced?

The question is in the title. I've made some research, but in every paper I found the correlation between $\ce{SO2}$ and $\mathrm{PM_{2.5}}$ is described as positive. Thus if $\ce{SO2}$ is reduced, $\...
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1answer
452 views

Coagulation with Ferric Chloride

I'm having a hard time understanding the use of coagulation wastewater treatment. I have read in literature that ferric chloride is used as a coagulant to remove COD, TSS and Ammonia from landfill ...
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0answers
41 views

Ozone depletion distribution [closed]

I am working with ozone measurements from two different sites (one rural and one urban). I am looking at the distribution of hourly averaged concentrations in air. The first figure shows the ozone ...
4
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1answer
949 views

What molecule is mostly responsible for the smell of petrol/gasoline when I refill my car?

Is it benzene or is there another aromatic molecule in gasoline with "heavier scents"? Does anybody know of a scientific investigation to provide evidence for an answer?
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1answer
2k views

How does pH level change the concentration of dissolved oxygen (DO) in sea water?

I am planning to investigate the relationship between $\mathrm{pH}$ and dissolved oxygen. I would like to have a reason without taking in account the plants, animals and decomposer roles. I want to ...
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0answers
135 views

How can I get rid of 700 million tons of chlorine gas?

I am conducting a thought experiment in which 40 million tons of hydrogen are supplied through saltwater electrolysis each year, creating 700 million tons of chlorine gas (Cl2) and 800 million tons of ...
3
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1answer
141 views

Is there any reason to fear personal exposure to rain with a pH of 3.1?

Where I live now there can be significantly acidic rain. The government posts measurements for many cities and there can be stretches for days or longer with reported pH of 3.2 or 3.1. I even saw 2.9 ...
4
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1answer
428 views

Exhaust gas purification

I'm more asking this because I'm not sure how far science has come. Pretty much, I've been thinking about the car exhaust system lately. The two main components that lead to hazards from cars are $\ce{...
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1answer
210 views

Is organic carbon the same thing as organic compounds?

Are they the same thing or is there some minute difference? I have looked all over the web and you would think this would be a common question but I can't find any answer. If they are different then ...
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2answers
125 views

Why NOx will break the ozone sphere

I've found that a reason for people to oppose supersonic aeroplanes was the $\ce{NO_{$x$}}$ gases it released would do harm to the ozone layer. So what is the mechanism of this?
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2answers
7k views

Is there an easy way to test for the amount of iron (Fe) in water?

I have a rusty metal rainwater tank, and I'd like to find the amount of iron in the water. (The water I've collected is perfectly clear.) How would chemists in the 1800's have gone about this? What ...
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1answer
2k views

pH of rain with and without thunderstorm

I just came to know that pH of rain water will be lesser when it is accompanied by a thunderstorm than when it is not accompanied by thunderstorm. Why would it be so? Will the temperature increase due ...
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1answer
188 views

Comparing Methods of Determination of Dissolved Oxygen Content in Water Sample

I am currently doing an IB Chemistry Individual Investigation on dissolved oxygen in water samples by using Winkler method. However, my teacher suggested that I have to use oxygen probe as a standard ...
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1answer
166 views

Is there a chemical treatment for pipes to reduce or eliminate leaching of lead into tap water?

Given events in Flint, Michigan, where a switch to acidic river water in the city water supply resulted in leaching of lead into tap water from the insides of pipes, I wonder -- has anyone has heard ...
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1answer
103 views

Finding out the composition of seawater/brine?

As part of a project, I am working on precipitating salts from seawater and brine. I have a sample of seawater and I need to measure the concentrations of $\ce{Mg^2+, Ca^2+ and Li+}$ present in the ...
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1answer
75 views

Why perborate is greener bleaching agent?

All I know is, perborate degrades into supposedly less harmful compounds. But what exactly happens that it is considered greener? Consider say perborate vs. hypochlorite. Why perborate is "greener"?
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1answer
7k views

Why does ozone, being heavier than air, not settle down? [duplicate]

Is this because of some equilibrium between diffusion and gravity ? What exactly is responsible?
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1answer
125 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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1answer
174 views

Heavy Metal Toxicity [closed]

Ok, so I am working on a project where I have to make a tax for manufacturers using non recyclable materials. So for this tax you multiply the weight (in kg) by how toxic the material is, this gives ...
4
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1answer
3k views

How much worse is methane than CO2 as greenhouse gas? [duplicate]

I can't find a coherent answer to this question. The numbers are all over the place. 25 times greater 84 times more potent The reason I'm looking is because I can't find a reason in physics why this ...