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Paper 5 Tips !! :)

X

xhizors

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Student12 said:
What column headings are we going to take to get the solubility and how to calculate?
Click to expand...
for solubility => u need mass of solid dissolved and mass of water in which it is dissolved
so mass of solid = D-B
mass of water = C-D
use formula Solubility = (mass of solidx100) / mass of water
for a better understanding of solubility see older post !
hope it helps
 
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Method of Cie to calculate solubility
-make a saturated solution add the solid to water at a particular temperature until
no more dissolves. Then add more solid and leave the mixture in a thermostatically
controlled water bath to establish equilibrium.
• Prepare a saturated solution at a temperature between 20 °C and 100 °C.
• Record the temperature of the saturated solution.
• Weigh an empty evaporating basin.
• Transfer some of the saturated solution, but no solid, into the weighed evaporating
basin.
• Weigh the evaporating basin and solution.
• Evaporate the water from the solution by placing the evaporating basin on top of a
beaker of boiling water.
• When all of the water in the solution has evaporated, cool and reweigh the
evaporating basin.
• Repeat the heating, cooling and weighing until a constant mass is obtained.
 
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PhyZac

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xhizors said:
np, feel free to ask :)

repeat until constant mass is acheived

repeat the experiments until constant mass of residue is achieved!
Click to expand...
Jazaka Allah khairan, In Sha Allah you get world distinction Aameen..


Well, okay i got that..

tell me is this true or false
we keep adding solid until no more is dissolved, let it cool (but we dont heat solution right?) and crystal will appear and we measure crystal and subtract from the mass of total solid added to find mass solid dissolved. ?
 
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xhizors

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PhyZac said:
Jazaka Allah khairan, In Sha Allah you get world distinction Aameen..


Well, okay i got that..

tell me is this true or false
we keep adding solid until no more is dissolved, let it cool (but we dont heat solution right?) and crystal will appear and we measure crystal and subtract from the mass of total solid added to find mass solid dissolved. ?
Click to expand...
actually u have to evaporate the water from saturated solution then allow it to cool to get the crystals and these crystals are initself the mass dissolved(P.S u must use all of the saturated solution to get the mass dissolved)!

when u substracts the mass of crystal from the initial mass, u use mass of undissolved crystals
take a simple analogy
you give 10 apples to a happy guy
he ate 6 apples(6mols of apples are dissolved)
u get back 4 apples by filtering his pockets
u substracts 10(initial mass/apples) by 4(undissolved apple) u get the dissolved apples!

Pray for me! :)
 
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xhizors

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Gémeaux said:
xhizors
Aoa,
I need help with this one, please.
View attachment 25309
Are these co-ordinates correct? Plus, the question states to *label* the point representing the saturated solution of CuSo4, how do we do that? (m.s. doesn't mention them :/)
Click to expand...
buddy i haven't attempted this paper yet, but definately In Sha Allah tommorow i am going to master this paper proActively!
till then rest :)
 
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xhizors said:
actually u have to evaporate the water from saturated solution then allow it to cool to get the crystals and these crystals are initself the mass dissolved(P.S u must use all of the saturated solution to get the mass dissolved)!

when u substracts the mass of crystal from the initial mass, u use mass of undissolved crystals
take a simple analogy
you give 10 apples to a happy guy
he ate 6 apples(6mols of apples are dissolved)
u get back 4 apples by filtering his pockets
u substracts 10(initial mass/apples) by 4(undissolved apple) u get the dissolved apples!

Pray for me! :)
Click to expand...
Okay Alhamdulilah I got it!
Thanks for the simplified way.

I am really sorry, but when you say to find solubility of a solid we consider water at room temperature only?
 
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xhizors

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PhyZac said:
Okay Alhamdulilah I got it!
Thanks for the simplified way.

I am really sorry, but when you say to find solubility of a solid we consider water at room temperature only?
Click to expand...
probably yes it can vary(the more the temp more AvgKE of Particles more quickly efficient collisions) but the temp @ which dissolving is happening must be constant
 
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xhizors

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Gémeaux said:
Oh okay, I'd wait until then. Thankyou.
Click to expand...
All Awesome Credit goes too knowitall10
i simply asked knowitall10
here's the response:
Yep thats right, the question came in my mock exam in school, i labelled the stauration point by drawing the dotted line downwards the way you have, but i didnt mark the moles of copper sulfate, and i still got it right. so from my side, i think its right. that's how you're supposed to do it.
 
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umaima61

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Can u tell me when seeing how the temp affects solubility what masses of solution do wee takee
Plzz help oc 2011 51 qus1
 
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umaima61

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When measuring solubity deepends on temp what masses of water and solid must be taken should they be the same or will they differ each time
And line of best fit must neccesarily pass through origin or can it start frm anywhere
Plzzz replyy
 
knowitall10

knowitall10

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xhizors said:
actually u have to evaporate the water from saturated solution then allow it to cool to get the crystals and these crystals are initself the mass dissolved(P.S u must use all of the saturated solution to get the mass dissolved)!

when u substracts the mass of crystal from the initial mass, u use mass of undissolved crystals
take a simple analogy
you give 10 apples to a happy guy
he ate 6 apples(6mols of apples are dissolved)
u get back 4 apples by filtering his pockets
u substracts 10(initial mass/apples) by 4(undissolved apple) u get the dissolved apples!

Pray for me! :)
Click to expand...
"Happy guy" lol:LOL:
 
knowitall10

knowitall10

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Assalamu alaykum people.. I had no idea there was a separate thread for P5... I uploaded this in the chem thread so that everyone gets it.. so here i'm uploading it again for the ones discussing here:)
May Allah Grant us all Paradise and Success- including the World Distiction(xhizors) ;)
 

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Xtremite

Xtremite

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Hey how wud i find the solubility of cerium sulfate in sulfuric acid? 5 mold dm-3 sulfuric acid, by the way

lots of prayers in advance
 
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