Chemistry: Post your doubts here!

[iKhaled]

i just wanna ask, when u r given concentration in g/dm^3 how can u change it into moles/dm^3 ?

 

[hmlahori]

i just wanna ask, when u r given concentration in g/dm^3 how can u change it into moles/dm^3 ?

just find the number of moles from the grams of the given substance in 1 dm3 and u get mol/dm3 thats it!

 

[umarashraf]

i just wanna ask, when u r given concentration in g/dm^3 how can u change it into moles/dm^3 ?

multiply the denominator by the Mr of the that substance and YOu will have mol per dm Cube....

 

[Goku]

Any tips for practicals?

 

[iKhaled]

what's a chemical test for ammonia gas?

 

[iKhaled]

i need someone to show me how to draw the neutralization graph :/

 

[Tazyeen K]

what's a chemical test for ammonia gas?

Ammonia turns damp red litmus paper blue.

 

[iKhaled]

Ammonia turns damp red litmus paper blue.

is that a chemical test?

 

[Tazyeen K]

is that a chemical test?

Wats a chemical test??

 

[Soldier313]

u just divide the mass by the molar mass of the substance to get the moles......so for example we are talkin about the concentration of HCl is let's say 3.65g/dm3 so u divide 3.65 by the Mr which is 36.5 and you get your conc as 0.1mol/dm3......hope you understood...

 

[Soldier313]

u just divide the mass by the molar mass of the substance to get the moles......so for example we are talkin about the concentration of HCl is let's say 3.65g/dm3 so u divide 3.65 by the Mr which is 36.5 and you get your conc as 0.1mol/dm3......hope you understood...

 

[iKhaled]

u just divide the mass by the molar mass of the substance to get the moles......so for example we are talkin about the concentration of HCl is let's say 3.65g/dm3 so u divide 3.65 by the Mr which is 36.5 and you get your conc as 0.1mol/dm3......hope you understood...

do uk how to draw the straight line of neutralization on the graph? pls help me

 

[Soldier313]

u just divide the mass by the molar mass of the substance to get the moles......so for example we are talkin about the concentration of HCl is let's say 3.65g/dm3 so u divide 3.65 by the Mr which is 36.5 and you get your conc as 0.1mol/dm3......hope you understood...

 

[Soldier313]

http://www.docbrown.info/page12/gifs/pHgraphnotes.gif
http://www.wiley.com/college/pratt/0471393878/student/review/acid_base/buffer_titration.gif

i got these from google...chek em out
but we havent done these sort of things at xul so i m not sure how to do it...sorry:/

 

[iKhaled]

http://www.docbrown.info/page12/gifs/pHgraphnotes.gif
http://www.wiley.com/college/pratt/0471393878/student/review/acid_base/buffer_titration.gif

i got these from google...chek em out
but we havent done these sort of things at xul so i m not sure how to do it...sorry:/

we haven't done that too, i understood the first graph but the second one not :/

 

[Soldier313]

yea same here i understood the first one but the second one is kinda complex...not for our level i think:/

 

[iKhaled]

yea same here i understood the first one but the second one is kinda complex...not for our level i think:/

can u have a look at nov/oct 11 u will see a graph where it says draw 2 lines which intersect do u have any i dea how to do that?

 

[Tazyeen K]

can u have a look at nov/oct 11 u will see a graph where it says draw 2 lines which intersect do u have any i dea how to do that?

We did that paper, and well wen u do it, the temp change you get, first increases and then decreases. So when you plot and draw you get One graph that goes up and another that comes down. U then extrapolate it and you get like a upside down V.
Hope u get it.

 

[Soldier313]

ch

can u have a look at nov/oct 11 u will see a graph where it says draw 2 lines which intersect do u have any i dea how to do that?

checked it.....zero idea:S

 

[iKhaled]

do

We did that paper, and well wen u do it, the temp change you get, first increases and then decreases. So when you plot and draw you get One graph that goes up and another that comes down. U then extrapolate it and you get like a upside down V.
Hope u get it.

u have skype?