2014 HSC Chemistry exam - Question 23 (1 Viewer)

[apurba]

The answers say:

Answers could include: phosphates and hydrogen ions

My question was whether nitrate ions are also a valid answer since they also cause eutrophication.

 

[Drsoccerball]

Nitrates dont cause Eutrophication... phosphates do.

 

[Ekman]

Nitrates dont cause Eutrophication... phosphates do.

Actually both nitrates and phosphates cause eutrophication, they are both nutrients

 

[kawaiipotato]

Nitrates dont cause Eutrophication... phosphates do.

Nitrates do contribute to eutrophification but to a lesser extent that phosphate ions.

 

[BlueGas]

Actually both nitrates and phosphates cause eutrophication, they are both nutrients

Ekman correcting Drsoccerball as usual lol.

 

[Drsoccerball]

Ekman correcting Drsoccerball as usual lol.

Thats a reason why i answer questions...

 

[apurba]

Aha so is nitrates worth the marks or nah?

 

[dan964]

I will still learn "phosphates" as the best answer to the Q. I am sure "nitrates" would be technically accepted.

 

[psyc1011]

Aha so is nitrates worth the marks or nah?

It contributes to eutrophication, so why not?

 

[Mr_Kap]

I will still learn "phosphates" as the best answer to the Q. I am sure "nitrates" would be technically accepted.

But why though?
What makes nitrates an inferior answer?

 

[Ekman]

But why though?
What makes nitrates an inferior answer?

Because when measuring the N ratio, in order to determine the amount of nutrients in a sample of water, phosphorus tends to be the growth limiting nutrient, hence we measure the N ratio according to the amount of phosphorus. The reason why phosphorus would be the better answer is because that is how eutrophication is determined, by the concentration of phosphorus.

 

[Drsoccerball]

Because when measuring the N ratio, in order to determine the amount of nutrients in a sample of water, phosphorus tends to be the growth limiting nutrient, hence we measure the N ratio according to the amount of phosphorus. The reason why phosphorus would be the better answer is because that is how eutrophication is determined, by the concentration of phosphorus.

You mean phosphates?

 

[Ekman]

You mean phosphates?

Actually, phosphorus causes the eutrophication. Of course the common way to dump phosphorus into waterways is when its in shampoos and detergents in the form of phosphates. So when you measure the N ratio, you don't measure the concentration of nitrates or phosphates, you measure the concentration of nitrogen and phosphorus.

 

[Mr_Kap]

Because when measuring the N ratio, in order to determine the amount of nutrients in a sample of water, phosphorus tends to be the growth limiting nutrient, hence we measure the N ratio according to the amount of phosphorus. The reason why phosphorus would be the better answer is because that is how eutrophication is determined, by the concentration of phosphorus.

So if I dumped a shit of nitrates into water and NO phosphorus, and we can see eutrophication, does that mean eutrophication cannot be determined quantitatively? lol. What even.

 

[Ekman]

So if I dumped a shit of nitrates into water and NO phosphorus, and we can see eutrophication, does that mean eutrophication cannot be determined quantitatively? lol. What even.

What you must understand is that the N[emoji14] ratio has limitations, because both nitrogen and phosphorus need to be present in the sample, so there are other ways of determining eutrophication quantitatively. Another common method is measuring BOD, which has no limitations. So does this answer your problem?

 

[Mr_Kap]

What you must understand is that the N[emoji14] ratio has limitations, because both nitrogen and phosphorus need to be present in the sample, so there are other ways of determining eutrophication quantitatively. Another common method is measuring BOD, which has no limitations. So does this answer your problem?

yeh i guess.

 

[dan964]

What you must understand is that the N[emoji14] ratio has limitations, because both nitrogen and phosphorus need to be present in the sample, so there are other ways of determining eutrophication quantitatively. Another common method is measuring BOD, which has no limitations. So does this answer your problem?

haha emoji conversion.

 

[Ekman]

haha emoji conversion.

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[Mr_Kap]

Consequences of using tapatalk

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[BlueGas]

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