Kinetics

how do i find R in terms of Rt R = rotaion At a time t = rotation of Sucrose = R0 - R i cant find R in terms of Rt as we do in pressure rate law
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28 Replies
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Opt
Opt2w ago
Uhhh your personal info is pretty visible, just saying.
Gamertug
GamertugOP2w ago
ye idc whats the worst someone gonna do call me?
Opt
Opt2w ago
W opinion
WOLVERINE
WOLVERINE2w ago
.noted
WOLVERINE
WOLVERINE2w ago
delete it bro
Opt
Opt2w ago
I got 104.233424 With a calculator (30ln(45/11))/ln(1.5)
Gamertug
GamertugOP2w ago
am asking how we get r in terms of Rt like we used to do in pressure
Opt
Opt2w ago
Ok, set initial conc. of sucrose to be 1. Let specific rotation of sucrose, glucose, and fructose be a,b,c respectively. Rotation = a[sucrose]+b[glucose]+c[fructose] c is actually going to be negative but that doesn't change anything. And since [glucose]=[fructose], You can write θ= (a)(1-x)+(b+c)(x) You get value of a from initial data. You get value of b+c from the end point data And then it's a matter of substituting and calculating Using first order kinetics because water is in excess
Gamertug
GamertugOP2w ago
ok what about after calculating abc
Opt
Opt2w ago
Write down the concentrations at various times. From the data for 19°, you get the value of k. From that you can calculate value of x such that θ=0 And from there you get t
Gamertug
GamertugOP2w ago
no like we do
Opt
Opt2w ago
Wait lemme write it down and send
Gamertug
GamertugOP2w ago
kt = ln (R0/R0-R)
Opt
Opt2w ago
Yeah
Gamertug
GamertugOP2w ago
how do we get R in terms of R0 and Rt
Opt
Opt2w ago
It's not R0-R tho? It's R0/R Initial/left
Gamertug
GamertugOP2w ago
what it was R0 Rotaion then R rotaion went out and became product or smth like we do in moles and pressure we cant do here?
Opt
Opt2w ago
Oh rotation I just calculated concentration It's easier Well, moles I just calculated moles Because rotation = specific rotation × concentration, but since volume is fixed, we can take it as specific rotation×no.of moles
Gamertug
GamertugOP2w ago
ooh so we can do the whole thing in mole ic ic
Pistulya
Pistulya2w ago
who knows bhai call karke galiyana shuru kar de
Gamertug
GamertugOP2w ago
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Gamertug
GamertugOP2w ago
i got this from calculator but how the hell are we suppose to find ln(45/11)??
Opt
Opt2w ago
Yeah same God knows.
Gamertug
GamertugOP2w ago
ok thx for the concept +solved @Opt
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