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Skye wrote on 2010-08-03 23:56
Why is calcium bisulfate Ca(HSO[SIZE="1"]4[/SIZE])[SIZE="1"]2[/SIZE] instead of Ca(SO[SIZE="1"]4[/SIZE])[SIZE="1"]2[/SIZE]? Why are the hydrogens there?
I just took a chemistry test yesterday and I missed this question. I don't get it. :P
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Sleet wrote on 2010-08-04 00:55
The bisulfate anion is HSO4(-). Sulfate anion is SO4(2-).
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Skye wrote on 2010-08-04 01:03
Oooooohhh. I thought the bi- just meant two sulfates. Thank you, Sleet. +rep for you for making my day a little brighter and teaching me something new. :)
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Skye wrote on 2010-08-04 01:20
Oooooohhh. I thought the bi- just meant two sulfates. Thank you, Sleet. +rep for you for making my day a little brighter and teaching me something new. :)
While I'm at it, how many neutrons would neutral lead (Pb, atomic no. 82) have? I missed that in a chart...
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Episkey wrote on 2010-08-04 01:37
I would have thought the same thing with the whole "bi" meaning two.
But it sadly it isn't that easy T_T
Another example:
carbonate= CO3
bicarbonate= HCO3
Bicarbonate is also known as hydrogen carbonate FYI. I prefer hydrogen carbonate since its longer and all I have to remember is to add a hydrogen to carbonate.
As for your lead question:
You need to know the mass number. You can't really answer it otherwise.
The mass number is the number of protons and neutrons in an atom.
The atomic number (in this case 82) tells you that a neutral lead atom has 82 protons.
Since it is neutral, in this case, that lead atom also has 82 electrons.
If you don't know the total amount, you can't find the amount of neutrons.
This concept is based off isotopes and that the same element can have a different number of neutrons.
Also remember neutrons are neutral, so they don't affect charge.
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Skye wrote on 2010-08-04 02:28
Quote from Episkey:
Bicarbonate is also known as hydrogen carbonate FYI. I prefer hydrogen carbonate since its longer and all I have to remember is to add a hydrogen to carbonate.
Dawwwww, I remember talking about the hydrogen now... T_T
Quote from Episkey:
The atomic number (in this case 82) tells you that a neutral lead atom has 82 protons.
Since it is neutral, in this case, that lead atom also has 82 electrons.
If you don't know the total amount, you can't find the amount of neutrons.
I know that, but the question didn't give a mass number. :/ Here's the chart we had to fill out:
[Image: http://i262.photobucket.com/albums/ii107/LOVE__gaara_of_the_desert/chemtable.png]
My answers are italicized, and I got the ones in blue correct. The red answer was wrong because I guessed and was lost on how to find the neutrons. :P
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Phunkie wrote on 2010-08-04 05:49
Oh wow. I hate chemistry.
I look up to all you people. :)
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IceBlade wrote on 2010-08-04 09:58
Unless they told you which isotope, it would be imposable to say, since it could be between 96 and 133 Neutrons. My guess would have been that they wanted you to use the standard atomic weight, which is 207.2. So 125 neutrons.
Source:
Lead ;
Isotopes of lead
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Skye wrote on 2010-08-04 11:39
Ok then. Thank you for those who helped my chemistry-poor brain. :)
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JustNoOne wrote on 2010-08-04 12:11
Why can't we have more threads like this? Argghhh I wanted to help :*(
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Episkey wrote on 2010-08-04 13:45
Lol. I love chemistry with a passion.
As for the Lead question, I think the netcharge has something to do with it...
Unless I look in a textbook, it seems impossible.
But at least you only got one part wrong :D
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JustNoOne wrote on 2010-08-04 14:14
lol than, let's see if you can figure this out =o
NaCl[SIZE="1"](aq) [/SIZE]+ H[SIZE="1"]2[/SIZE]O[SIZE="1"](l)[/SIZE] > Na(OH)[SIZE="1"](aq)[/SIZE] + HCl[SIZE="1"](g)[/SIZE]
I just need some Sodium Hydroxide for some pretzels I'm planning on making, but sadly I can't find anyone >.> So I want to make some homemade Sodium Hydroxide and get it in aqueous form so later on I can use ^^
How can you make the reaction occur? :what:
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IceBlade wrote on 2010-08-04 14:22
Just buy some caustic soda and mix it with water :/
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JustNoOne wrote on 2010-08-04 14:33
Caustic soda is not available for me :*(
Besides, it's pretty high on the pH scale with a pH of like... 13 so I can't randomly get it in a store :T_T:
I'm also lazy =p
But it's the Lye I'm looking for :*( I need lye with my pretzels Dx
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Infamy wrote on 2010-08-04 14:34
Speaking of bisulfate... it was used in this process to recover gold from old motherboards =P
A Real Gold Mine? - Picture Story - Tom's Hardware