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2+ means the ion has a charge of 2+ where the atom has lost two electrons causing the positively charged ion to have 2 more protons than electrons - Pb is lead
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a Pb2+ ion is an ion where the lead atom has lost two electrons. To become an atom again the ion must gain two electrons to have a neutral charge and you can show this in the half-equation of Pb2+ + 2e > Pb ..... does this help?
Br- ions have one extra electron than protons due to the -1 charge. A br- ion will have a full outer shell, so to lose one electron will mean the anion becomes an atom with a neutral charge where the number of protons and electrons are the same and they can each other out. Did that help?
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@Walin Thohirah what happens is the negatively charged bromide ions (Br-) are attracted to the anode (positively charged). At the anode each Br- anion loses 1 electron each forming bromine atoms. Two bromine atoms then form a covalent bond, forming a bromine molecule. Does that help?
@@KayScience Incorrect, Hydrogen is produced at the cathode, due to Lead being more reactive than Hydrogen as stated in the reactivity series. Please correct me if I'm wrong.
@@Ok-up7ty this is the electrolysis of MOLTEN lead bromide!! The only ions in the electrolyte are lead and bromide ions, so hydrogen cannot be formed. You are thinking of an aqueous solution, however lead bromide is insoluble in water so the electrolysis of lead bromide has to be done when the electrolyte is molten.
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I like the detailed explanations👏
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This is really helpful. Thankyou
Sir your explation was very nice and I got full marks in exam because of you
Amazing to hear! Love it :)
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This was very helpful thank you so much.
All of my doubts are solved thanks a lot sir...🙌
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Thanks Kay science for your free lectures it is really helping me in preparing for caie.
You're very welcome!
you sound like professor snape naturlly! love it
Thank you its helpful
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Thanks sir ❤ very nice explanation
6:45 where did the chlorine come from?
that is why the answer is wrong
@@leonardtangindipolifa8944 ohh okay
الحمد لله ❤
can I ask? I don't really understand that part when the pb at the cathode become two?
Thanks broski
why do we write pb2+ and not pb+,i have had this doubt for a really long time pls reply
2+ means the ion has a charge of 2+ where the atom has lost two electrons causing the positively charged ion to have 2 more protons than electrons - Pb is lead
Thanks so much.
Really helpful 👍
You have wrote negatively charged anions will GAIN electrons to become neutral at the end, in Q5) that has to be a correction if I'm right
thank you, silly mistake, forgot to change when making the questions!!
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Thanks
you are very welcome :)
thankful alot!
Why is it Pb^2+ + 2e-. I am a little confused as Pb2+ needs to lose 2 electrons to become Pb so I keep thinking it should be Pb^2+ - 2e-.
a Pb2+ ion is an ion where the lead atom has lost two electrons. To become an atom again the ion must gain two electrons to have a neutral charge and you can show this in the half-equation of Pb2+ + 2e > Pb ..... does this help?
I dont understand why Br- ions become a Br atom when it loses an electron. It has 7 electrons on the outer shell so shouldnt it gain not lose?
Br- ions have one extra electron than protons due to the -1 charge. A br- ion will have a full outer shell, so to lose one electron will mean the anion becomes an atom with a neutral charge where the number of protons and electrons are the same and they can each other out. Did that help?
@@KayScience ohhhhhhhhhhh. That definitely helps. Thanks for that👍
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why does bromine gas form at the anode?
Because finally they form Bromine molecules after loses electrons,which is Br2 ,its is gas.
@Walin Thohirah what happens is the negatively charged bromide ions (Br-) are attracted to the anode (positively charged). At the anode each Br- anion loses 1 electron each forming bromine atoms. Two bromine atoms then form a covalent bond, forming a bromine molecule. Does that help?
What were the electrodes made of
Can be made of graphite
how do u know which one of lead and bromide is positive and which is negative pls answer
The power supply is labeled
so what is produced at the cathode and anode?
Lead is produced at the cathode and bromine is produced at the anode
@@KayScience Incorrect, Hydrogen is produced at the cathode, due to Lead being more reactive than Hydrogen as stated in the reactivity series. Please correct me if I'm wrong.
@@Ok-up7ty this is the electrolysis of MOLTEN lead bromide!! The only ions in the electrolyte are lead and bromide ions, so hydrogen cannot be formed. You are thinking of an aqueous solution, however lead bromide is insoluble in water so the electrolysis of lead bromide has to be done when the electrolyte is molten.