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  1. X

    Paper 5 Tips !! :)

    They are v.easy assume u have 2mol/dm3 HCl and u have to prepare 5 solutions of HCL of different concentrations sol A) u take 50cm3 of 2 mol/dm3 --> conc= 2mol each dm3 sol B) u add 10cm3 of Distilled water and 40cm3 of HCl in any container 50cm3-->2mol/dm3 40cm3--> x by unitry...
  2. X

    Chemistry p5

    why not! you immeresed thermometer in water bath to observe or measure the temperature, as sulfur is being produced in reaction vessel(ur apparatus i guess) which is going to opaque the system so u cant measure it and it is stated u have to measure it accurately for this: However, in (d)in...
  3. X

    Paper 5 Tips !! :)

    Zn + I2 --> ZnI2 so reacting I2 gives I2 means no. of moles of I2 used divided by its Ar, (any comment on this one specifically) JazakAllah
  4. X

    Paper 5 Tips !! :)

    Enthalpy Change of Solution(Use Calorimeter) -Pour Water 50cm3 in Plastic cup -stir a little and measure its temperature (remem 0.2 graduations) its initial temp -cautiously take NaOH as it is corrosive (use hand gloves as it can react with a moisture in your hand) measure 30cm3 of Naoh using...
  5. X

    Paper 5 Tips !! :)

    Feel free to give feedback or any comment!! :) waiting
  6. X

    Chemistry p5

    Voila its Easy :P First react Na Thio bro with Potassium Sulfate to get Iodide Ions with a 20cm3 each then pour persulfate to them after adding starch and start stop watch and stop it until blue color appears take care of capacity of apparatus like 250 cm3 conical flask, 100cm3 measuring...
  7. X

    Paper 5 Tips !! :)

    Ce(SO4)2 solubility decreases in sulfuric acid as concentration increases due to common ion effect!!
  8. X

    Paper 5 Tips !! :)

    Measuring Enthalpy Change of Neutralisation!(remember we have to use calorimeter) For this You have to have an equal amounts of both Reactants to make a solution 1) Take 150cm3 Polystyrene/Plastic cup(it is a good insulator) 2) use burette to measure 50cm3 of acid 3) Transfer 50cm3 of acid in a...
  9. X

    skim pp's again don't leave anything just don't settle for the less u can be go get the P1, Have...

    skim pp's again don't leave anything just don't settle for the less u can be go get the P1, Have a good Day:)
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  10. X

    lol @ your username nice to meet u

    lol @ your username nice to meet u
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  11. X

    lol @ your username nice to meet u

    lol @ your username nice to meet u
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  12. X

    yeah!!, who u?

    yeah!!, who u?
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  13. X

    Paper 5 Tips !! :)

    When you are required to measure enthalpy changes of: a) Neutralization b) Solution c) Combustion use Calorimeter: To setup a Calorimetery type Apparatus: -Take a polystyrene Cup(usually 150cm^3) or Metal Can (any like Copper) and Vacuum flask (if you are taking polystyrene cup it is a good...
  14. X

    Paper 5 Tips !! :)

    AsSalamalaikum wr wb I would like to share some keyPoints i discovered, Learned while doing papers ( a wide variety) here you go! Generally there are 4 or more types of Questions a) Stoichiometry(Mole Ratio Ones), titrations too b) Enthalpy Changes Questions c) Common Ion Effects guys d)...
  15. X

    Chemistry: Post your doubts here!

    well i don't knw it is only used for dilution i used the concept of titration here and a little of partition cofficient btw thanks
  16. X

    Chemistry: Post your doubts here!

    (mol of a solid)x1000/mass of water
  17. X

    Chemistry: Post your doubts here!

    ok thanks !!
  18. X

    chemistry solved p5

    Salam, Best Attempt, but only two little things i think u left, in the first 2 scanned copies(Hc one) talking specifically a) stirr the solution with thermometer and measure the 10`C temperature rise also initially measure the water temperature b) in processing results show the use of equation...
  19. X

    Chemistry: Post your doubts here!

    whats the second column heading ??
  20. X

    Chemistry: Post your doubts here!

    thanks for the fact, only more able candidate can observe it :) nd u did too
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