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.
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??!!
yup them too!!!
ahh thanks you guys... do any of you chemists have any idea about these concepts;
http://www.thestudentroom.co.uk/showthread.php?t=1158350
http://www.thestudentroom.co.uk/showthread.php?t=1158350
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.
Please clear,will thermal stability of hydroxide will increase or decrease
down the group?
Original post by Hafiya
Please clear,will thermal stability of hydroxide will increase or decrease
down the group?
down the group?
Wow, I posted this 9 years ago. Your question is answered literally in the first sentence of my post, and repeated in the last sentence.
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.
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