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Chemo P5 tips
- Thread starter zeebujha
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ok ppl iam shifting to AS p2 discussion side ....Saudha cud u come there too....i guess its enough for us to give this much time for p5...now its time for p2
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saudha only...
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Somebody PLEASE reply to my above question. Its basic! C'mon somebody must know! =/
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use a syringe ..
- 250cm3 conical flask with potassium chloride in it
- 0-100 degree Celsius range thermometer
- thermometer in [KCl] not touching the edge or bottom of the flask
- conical flask on top of tripod and gauze
- under the tripod is Bunsen burner...
1 molar= Mr in 1000cm3
for e.g the mass used here is Pb(NO3)2 ......this question came in O/N 10
so, 1 molar of Pb(NO3)2= Mr of Pb(NO3)2 in 1000cm3
1 molar = 331
0.1 molar = x
u cross multiply and get x as 33.1
then,
33.1= 1000cm3
x= 250cm3
cross multiply and u'll get x as 8.3g
mix 8.3grams of Pb(NO3)2 with small amount of water (MUST BE LESS THAN 250cm3)
make sure all the solid is dissolved....transfer the solution and all its 'rinsings' into a 250cm3 volumetric flask, add water till the 250cm3 mark
shake to mix the solution
hope u got it, im not good in explaining though...
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can someone please tell what the examiner means by "use a range of atleast 40 degrees"
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can someone please tell what the examiner means by "use a range of atleast 40 degrees"
whats meant by range here?
one more tip
let say u are running a decomposition experiment .....then the possible errors cud be SOLID BLOWN OUT DUE TO NOT HEATING GENTLY........and INSUFFICIENT HEATING SO NOT FULLY DECOMPOSED........the point of overheating does not applies everywhere....cos some residue salts require too high a temperature to be decomposed......
one more thing.....to avoid insufficient heating as an error.....then MAKE SURE U ARE HEATING TO CONSTANT MASS
let say u are running a decomposition experiment .....then the possible errors cud be SOLID BLOWN OUT DUE TO NOT HEATING GENTLY........and INSUFFICIENT HEATING SO NOT FULLY DECOMPOSED........the point of overheating does not applies everywhere....cos some residue salts require too high a temperature to be decomposed......
one more thing.....to avoid insufficient heating as an error.....then MAKE SURE U ARE HEATING TO CONSTANT MASS
yea i dont saw at actually .....bt there is a partition in the concial flask between solid and and liquid....so when u shake the flask the partition wall falls down
one USEFUL TIP....
Whenever dealing with hydrogen or other flammable gases in any experiment....safety precaution is too keep away from flame...or else an explosion
one USEFUL TIP....
Whenever dealing with hydrogen or other flammable gases in any experiment....safety precaution is too keep away from flame...or else an explosion
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hello frens plz help me in the question of of p 53 of M/J 2011 Q no (1) (c) .. how do you draw the diagram of the apparatus.. i'm really confused with how to draw a water bath and 
i'd be really glad if someone would right away help me out.. and how do we actually fix the apparatus to get the time for the rate of the reaction (how do u actually use the x-marked paper below the conical flask when u have to keep the tempr constant by using the waterbath) ?? i'm really confused with this one.. and to really say i've never seen a diagram of a waterbath so please as for a sample, help me out guyzz !
i'd be really glad if someone would right away help me out.. and how do we actually fix the apparatus to get the time for the rate of the reaction (how do u actually use the x-marked paper below the conical flask when u have to keep the tempr constant by using the waterbath) ?? i'm really confused with this one.. and to really say i've never seen a diagram of a waterbath so please as for a sample, help me out guyzz !
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hey... wht is best appratus to collect a gas above water ..like oxygen???
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Hey, does anyone have the ER for chemistry O/N 2011? If so, could you please upload it? Thanks!