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Hello, I need help here. For 9701_w09_qp_42 , question 2d (ii), I don't quite get how the question is done.
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um in c (i) we calculated [Ag+] = 7.1x10^-7Hello, I need help here. For 9701_w09_qp_42 , question 2d (ii), I don't quite get how the question is done.
um in c (i) we calculated [Ag+] = 7.1x10^-7
now they are asking us to calculate [NH3] that wil give us this value of [Ag+].. and they have given ys the concentration on silver nitrate... here we have to assume that due to ligand substitution silver nitrate got converted into the complex [Ag(NH3)2] so the concentration of this complex is also 0.1 mol/dm3...
ur expression for kc is kc = [Ag(NH3)2] / [Ag+][NH3]^2
u know kc,[Ag+] and [Ag( NH3)2].... find [NH3]
When R=H, RNH2= NH3 and [Ag(RNH2)2]+ = [Ag(NH3)2]+
So your Kc expression is -
Kc= [Ag(NH3)2]+/[Ag+] [NH3]^2
The question asks you to find the conc of NH3 when the conc. of silver ions is the same as you answer to ci.
So [Ag+] = ci = 7.1* 10^-7
[Ag(NH3)2] =.1 (given in dii)
therefore
1.7*10^7 = .1/ (7.1*10^-7) * [NH3]^2
[NH3]= .091 mol/dm^3
welcum !Ah.. So it it based on an assumption. I understand now. Thanks alot! =)
Hello, thanks for replying too, but I was actually wondering why do they use [Ag(NH3)2] as 0.1 , but biba explained it to me already, so thanks anyways! =)
For 4bi..u never did that titration in ur life ?http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s10_qp_43.pdf
Can Someone please explain me Question 4b (i) and 4(c)
i did but wht i actually want to know is that why doesn't the colour change from green to red-brown??? y is it changing to colourless or pale yellow???F
For 4bi..u never did that titration in ur life ?
idk man thats how i see it when i did the titration and then when u add excess of KMno4 it goes completely dark purplei did but wht i actually want to know is that why doesn't the colour change from green to red-brown??? y is it changing to colourless or pale yellow???
ahaidk man thats how i see it when i did the titration and then when u add excess of KMno4 it goes completely dark purple
Allah Yawaffagkum!!!
Good Luck for your Chemistry P4 tomorrow!!!
May Allah Succeed us all!!!!!!!!!!!!!!!!!!!!
NMR is used to obtain the information about the number of hydrogen atoms and their chemical environment (to predict the structure of organic molecules ).hey guys can anybody tell me the different purposes of glc, mass spectrometry, nmr, hplc and tlc
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_43.pdf
Can Someone please explain me Question 4b (i) and 4(c)
Someone help me out in 3 e please!!! http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_43.pdf
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