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    Increase or decrease??????
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    (Original post by MedAmy)
    Increase or decrease??????
    You mean metal(II) hydroxide?
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    Solubility of the hydroxides increases as you go down Group
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    (Original post by Haz Shah)
    Solubility of the hydroxides increases as you go down Group
    no not solubility. Thermal Stability
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    (Original post by shengoc)
    You mean metal(II) hydroxide?
    yep. Does it increase or decrease going down the group?
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    Thermal stability increases down the group due to the decrease in the charge density of the metal cation. All group 2 metal ions have the same charge (2+) but the smaller ones at the top of the group have it all packed into a smaller space so they polarise the O-H bond more (pull electrons towards the oxygen). This means the O-H bond is already partly broken so it requires less heat to break fully. As you go down the group the O-H is less polarised by the larger group 2 cations with a lower charge density so the thermal stability increases.
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    (Original post by Kyri)
    Thermal stability increases down the group due to the decrease in the charge density of the metal cation. All group 2 metal ions have the same charge (2+) but the smaller ones at the top of the group have it all packed into a smaller space so they polarise the O-H bond more (pull electrons towards the oxygen). This means the O-H bond is already partly broken so it requires less heat to break fully. As you go down the group the O-H is less polarised by the larger group 2 cations with a lower charge density so the thermal stability increases.
    ah thanks Kyri.. I knew the carbonates increased and the reasons for it. but didn't know the OH definitely increases TOO??!!
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    yup them too!!!
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    ahh thanks you guys... do any of you chemists have any idea about these concepts;
    http://www.thestudentroom.co.uk/show....php?t=1158350
 
 
 
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