observations help?

Question

This is an observation am trying to explain...if u have done that or have any idea about what am asking plez...help me..i would really appreciate your assistance..

Aim: To obtain a sample of pure water from sea water..

-Tiny particles were seen floating on the surface of sea water, as the sea water was heated.....Why do u thin that happened?

-The sea water began to boil at 106 degress C..why do u think it boil at that point?

-When silver nitrate was added to the sea water,it got warm and a white precipitate was formed...why did it get warm and form a white precipitate?

-When silver nitrate was added to the distilled water,the silver nitrate dissolved partly and shiny particles were seen in the solution....why do u think shiny particles were seen in the solution after been dissolved?

Answer 1

I am not sure as to some of the answers to the questions, so I wasn't going to answer, but when i saw your cute name I thought that I would try and help out :)

Part 1 - not sure, do you have better description of what they looked like

Part 2 - The NaCl in the sea water acts as an impurity and causes the boiling point of the water to increase, although 106°C seems very high, would have expected an increase of roughly 1°C or so.

Part 3 - Silver nitrate added to salt water will cause silver chloride to precipitate out as it is insoluble in water. The warming I suspect is part of the chemical reaction, ie heat given off.

Part 4 - The only thing that I can think is that the silver nitrate, which is reactive to light, is reacting with the light to form a silver precipitate which are the shiny particles seen.

Hope this helps, sorry I couldn't of been more help.
Ktrna

Addition:

I have come up with a possible solution to part 1. As the temperature increase the microbial life can't take the increase in temperature and die. These then float to the surface clump up and are seen as little floaters. Just an idea.

Answer 2

Tiny particles were seen floating on the surface of sea water, as the sea water was heated.....Why do u thin that happened?

>>>It could be that there were impurities in the sample that you didn't notice before. Or you've boiled off enough water that you're starting to see salt crystallize as the solution becomes more concentrated.

-The sea water began to boil at 106 degress C..why do u think it boil at that point?

>>>The only thing that could make it boil at 106 degrees is if you've got a lot of impurities in it. Adding salt to water will cause the boiling point to elevate to about 100.6 degrees...but not to 106 degrees.

-When silver nitrate was added to the sea water,it got warm and a white precipitate was formed...why did it get warm and form a white precipitate?

>>>You are seeing/feeling a chemical reaction that is exothermic (putting off heat)

NaCl + AgNO3 -----> NaNO3 + AgCl (white precipitate)
see the source listed below.

-When silver nitrate was added to the distilled water,the silver nitrate dissolved partly and shiny particles were seen in the solution....why do u think shiny particles were seen in the solution after been dissolved?

I can't figure this one out...unless the water wasn't distilled....or the container was dirty.

Answer 3

Have you ever considered taking an ESOL class?