Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    10
    ReputationRep:
    How can I know when sufficient water has been removed at the end of a crystallisation process; the part where you heat the hydrated crystals?

    Just in case, the whole question follows:

    Spoiler:
    Show
    When the reaction is finished, the excess copper(II) oxide is removed via filtration.
    To prepare crystals of copper(II) sulfate-5-water, CuSO4.5HsO, the resulting solution is boiled to remove excess water.
    How would you know when sufficient water had been removed?
    • Welcome Squad
    Offline

    20
    ReputationRep:
    When the mass of the substance no longer changes after heating. (I think - may be completely wrong)

    Posted from TSR Mobile
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by Obiejess)
    When the mass of the substance no longer changes after heating. (I think)

    Posted from TSR Mobile
    Wouldn't it keep changing until all the water is gone?
    In this case I think they want to keep 5 moles of H2O within one mole of CuSO4 crystals, hence knowing when to stop removing water.
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (Original post by Wunderbarr)
    Wouldn't it keep changing until all the water is gone?
    In this case I think they want to keep 5 moles of H2O within one mole of CuSO4 crystals, hence knowing when to stop removing water.
    No idea then. Sorry.

    Posted from TSR Mobile
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by Obiejess)
    No idea then. Sorry.

    Posted from TSR Mobile
    It's fine, thanks for your input anyway "Gunther".
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (Original post by Wunderbarr)
    It's fine, thanks for your input anyway "Gunther".
    Wish I could have been more help.

    Posted from TSR Mobile
 
 
 
Poll
Which Fantasy Franchise is the best?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.