Chemistry: Post your doubts here!

[anastasia grey113]

I remember it was about 99.48 something, Boiling point increases when you add impurities but when pressure decreases the boiling point decreases as well. It was logical though and i dont know how high pressure would fit to be correct.

yh
n if the atmospheric pressure had been lower, the water will take lesser temp to reach that pressure
oh my god yes my answers correct lol

 

[anastasia grey113]

i think the answer is KCl even though most of friends used AlCl3

well i wrote the same but idk
most of us wrote AlCl3 too

 

[Error Syntax]

i think the answer is KCl even though most of friends used AlCl3

The reason I choose KCL was that it required the least amount of moles as compare to others, like the concentrations were given so you could calculate the amount required and because it was talking about cation as well.

 

[Zaki ali asghar]

A ON 20
A ON 20
A ON 20
PLEASE

 

[Holmes]

what do u guys think about the Kb ( constant for pure water)?

that's what I thought

 

[anastasia grey113]

The reason I choose KCL was that it required the least amount of moles as compare to others, like the concentrations were given so you could calculate the amount required and because it was talking about cation as well.

but that was for iron which was positively charged aint it?

 

[Zaki ali asghar]

i think the people who chose ACL3 thought that due negative power, the numbers were decreasing but they were actually increasing.

 

[anastasia grey113]

A ON 20
A ON 20
A ON 20
PLEASE

ik plz pray for that

 

[anastasia grey113]

i think the people who chose ACL3 thought that due negative power, the numbers were decreasing but they were actually increasing.

wait in the table
the numbers were increasing downwards right?

 

[sterryfox]

The reason I choose KCL was that it required the least amount of moles as compare to others, like the concentrations were given so you could calculate the amount required and because it was talking about cation as well.

Same now i just hope its right

 

[Error Syntax]

but that was for iron which was positively charged aint it?

Fe203 was postively charged and so the whole question talked about the negative ion of Sulphate and how Sulphate caused precipiation so by that relatonship Arsenic was negatively charged so over here we needed to talk about the positively charged ion

 

[sterryfox]

wait in the table
the numbers were increasing downwards right?

yes

 

[anastasia grey113]

Same now i just hope its right

well from the trend
i could make out that the more opposite the charge was, the lesser the amount was required to ppt. it
and AlCl3 had the highest amount becuz Fe was positively charged
while arsenic was negative so the most positive had to be the most effective and required least mass

 

[anastasia grey113]

Fe203 was postively charged and so the whole question talked about the negative ion of Sulphate and how Sulphate caused precipiation so by that relatonship Arsenic was negatively charged so over here we needed to talk about the positively charged ion

yh
but AlCl3 was more positive so wasnt it post to be more effective?

 

[Zaki ali asghar]

but acc to table ALCL3 req the greatest mass

 

[anastasia grey113]

but acc to table ALCL3 req the greatest mass

ohhhhhhhh yh now i get it lol
shiz m defo getting a 23 now

 

[Error Syntax]

yh
but AlCl3 was more positive so wasnt it post to be more effective?

The table of concentrations that caused ppt were based on that effectiveness of charge and the least amount of moles required was for KCL3 which was around 1.02x10^-3 others increased downwards

 

[Zaki ali asghar]

i am losing so many marks. SHIT. acc to threshold the minimum i scored last year was a 97. Still need around 100 for an A*. :"(

 

[anastasia grey113]

but acc to table ALCL3 req the greatest mass

no wait wut?
lol idk now m confused
cuz Mr was different for all so moles were different

 

[Holmes]

ohhhhhhhh yh now i get it lol
shiz m defo getting a 23 now

Still on the "A" borderline