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Chemistry Question

Beachbum1546

Beachbum1546

New member
If 33.5mL of silver nitrate solution reacts w/ excess potassium chloride solution to yeild 0.680g of precipitate. What is the molarity (M) of silver ion in the original solution?

Ag(NO3) + KCL -> AgCl(s) + K(NO3)(s)

K for answers
 
oh ummm E=MC2 so do i get karma now?
 
Well, you have the amt of ppt in grams, so carry out a mole-to-mole conversion backwards to find the amount of AgNO3 needed to produce 0.680g KNO3 given xcess KCl (the AgNO3 is the limiting reagent). When you find the number of moles of AgNO3 used, how do you relate that to the number of moles of Ag+ ions in the ionic compound Ag+NO3-?

Remember M = moles/L
Everything's in a 1:1 mol rat
AgNO3 = 170 g/mol
KNO3 = 101 g/mol
 
samoth said:
Well, you have the amt of ppt in grams, so carry out a mole-to-mole conversion backwards to find the amount of AgNO3 needed to produce 0.680g KNO3 given xcess KCl (the AgNO3 is the limiting reagent). When you find the number of moles of AgNO3 used, how do you relate that to the number of moles of Ag+ ions in the ionic compound Ag+NO3-?

Remember M = moles/L
Everything's in a 1:1 mol rat
AgNO3 = 170 g/mol
KNO3 = 101 g/mol
Click to expand...


Stoichiometry blows. :evil:

Cheers,
Scotsman
 
I have a cheese-shredder at home, which is its positive name. They don't call it by its negative name, which is sponge-ruiner. Because I wanted to clean it, and now I have little bits of sponge that would melt easily over tortilla chips...
 
Beachbum1546 said:
naw, I need the answer.
Click to expand...

lol

AgNO3 + xcess KCL <-----> KNO3 (ppt) + AgCl

Given: 33.5 mL AgNO3, 0.680g KNO3
MW AgNO3 = 170g/mol, MW KNO3 = 101g/mol

(I usually carry sig figs through calculations)

First multiply through using the 1:1 mol rat to get the number of moles of reactant used. All molar and ionic quantities are 1:1, so that simplifies things:

0.680g KNO3 * (mol KNO3/ 101g KNO3) * (mol AgNO3/ mol KNO3) = 6.71x10^-3 mol of reactant AgNO3 used.

Then, using the definition M = mol/L:

M = mol/L = (6.71x10^-3)/(0.335 L) = 0.2M AgNO3 sol'n

Now, since the ionic compound Ag+ NO3- is in a 1:1 ratio, the molarity of Ag+ ions is also 0.2M.



It's been been a while since I've done this, so you might wanna verify the work. It seems kinda basic, so hopefully thier isn't something I overlooked. It's not a K(sp) problem, is it? It seems to be a basic 1:1 ppt ionicy-type problem.
 
samoth said:
lol

AgNO3 + xcess KCL <-----> KNO3 (ppt) + AgCl

Given: 33.5 mL AgNO3, 0.680g KNO3
MW AgNO3 = 170g/mol, MW KNO3 = 101g/mol

(I usually carry sig figs through calculations)

First multiply through using the 1:1 mol rat to get the number of moles of reactant used. All molar and ionic quantities are 1:1, so that simplifies things:

0.680g KNO3 * (mol KNO3/ 101g KNO3) * (mol AgNO3/ mol KNO3) = 6.71x10^-3 mol of reactant AgNO3 used.

Then, using the definition M = mol/L:

M = mol/L = (6.71x10^-3)/(0.335 L) = 0.2M AgNO3 sol'n

Now, since the ionic compound Ag+ NO3- is in a 1:1 ratio, the molarity of Ag+ ions is also 0.2M.



It's been been a while since I've done this, so you might wanna verify the work. It seems kinda basic, so hopefully thier isn't something I overlooked. It's not a K(sp) problem, is it? It seems to be a basic 1:1 ppt ionicy-type problem.
Click to expand...

Looks right to me.

Cheers,
Scotsman
 
GoldenDelicious said:
i want a royalty or something, cause i sorta just made it up

man this concussion sucks, i cant even remember posting in this thread :(
Click to expand...


I have to spread before hitting you again, lol.

And tumor >>> concussion, but at least I can remember posting in this thread, lol.
 
samoth said:
I have to spread before hitting you again, lol.

And tumor >>> concussion, but at least I can remember posting in this thread, lol.
Click to expand...
man dont even joke about that...and i have a huge headache too :(

i must only hit 10 or so people with k because i always have to spread, its ridiculous
 
mountain muscle said:
Damn you deserve red for that Scots :P
Click to expand...

Shut it fucko!!!!!

Had a derrick hand die up here yesterday on a rig one of our crew was on, pretty sad day all around.

Cheers,
Scotsman
 
GoldenDelicious said:
man dont even joke about that...and i have a huge headache too :(

i must only hit 10 or so people with k because i always have to spread, its ridiculous
Click to expand...


lol, I wasn't joking, I'd totally take a concussion instead. Although I've never had one, so I don't know what they're like much...



:cow:
 
samoth said:
lol, I wasn't joking, I'd totally take a concussion instead. Although I've never had one, so I don't know what they're like much...



:cow:
Click to expand...
well, the concussion ive had so far leave you feeling kind of scattered...sort of like that feeling you get the morning after going out and partying really really hard...trouble concentrating or getting into the mood for anything, as well as being forgetful as hell...im constantly losing my keys and my coffee around here today

another example is that i have no idea if the reply i just typed out is actually relevent. :(

jack_schitt: i just went to hit you. apparently i have to spread LOL ;)
 
GoldenDelicious said:
well, the concussion ive had so far leave you feeling kind of scattered...sort of like that feeling you get the morning after going out and partying really really hard...trouble concentrating or getting into the mood for anything, as well as being forgetful as hell...im constantly losing my keys and my coffee around here today

another example is that i have no idea if the reply i just typed out is actually relevent. :(

jack_schitt: i just went to hit you. apparently i have to spread LOL ;)
Click to expand...


How long do the effects of a concussion last, in general? Is there a severity rating for them?



:cow:
 
samoth said:
How long do the effects of a concussion last, in general? Is there a severity rating for them?



:cow:
Click to expand...
its one of those 'how long is a piece of string' questions. it can take days or months. if there is a severity scale, i havnt heard of it (theres bound to be one somewhere, but its so subjective i dont think itd be terribly useful outside professional/specialist circles)

the ones you get from sport/fights etc (the ones i see people coming into the pharmacy with) tend to go along the lines of: headache for anywhere from a couple of days to a bit over a week, memory disturbance for weeks, starting off reasonably significant and tapering off, speech disturbance same pattern as memory loss, general decrease in mental clarity same pattern as memory loss.

oh and drugs like alcohol will affect you more.
 
GoldenDelicious said:
its one of those 'how long is a piece of string' questions. it can take days or months. if there is a severity scale, i havnt heard of it (theres bound to be one somewhere, but its so subjective i dont think itd be terribly useful outside professional/specialist circles)

the ones you get from sport/fights etc (the ones i see people coming into the pharmacy with) tend to go along the lines of: headache for anywhere from a couple of days to a bit over a week, memory disturbance for weeks, starting off reasonably significant and tapering off, speech disturbance same pattern as memory loss, general decrease in mental clarity same pattern as memory loss.

oh and drugs like alcohol will affect you more.
Click to expand...


Interesting... I'm sure it causes quite a disturbance in a person's life. I've heard the word concussion used like it was a small cut or scrape, and I've heard it used like it was major trauma, so I figured there was kinda a 'scale' or something, like with burns.

Good luck with it, at least it doesn't sound like you have to keep going through surgeries.




:cow:
 
Scotsman said:
Shut it fucko!!!!!

Had a derrick hand die up here yesterday on a rig one of our crew was on, pretty sad day all around.

Cheers,
Scotsman
Click to expand...

I will ignore the fucko for now since you were obviously talking to rocks again.
What happened to him? Didn't hook in on the board? Damn bro that sucks. I am sure I will hear about in the accident reports soon. What rig was it?
 
mountain muscle said:
I will ignore the fucko for now since you were obviously talking to rocks again.
What happened to him? Didn't hook in on the board? Damn bro that sucks. I am sure I will hear about in the accident reports soon. What rig was it?
Click to expand...


Harness belt broke, the pull back rope tangled him up so when the strap caught it broke his neck. He was tied off properly just a freak accident. Not sure the rig number but it was a DHS rig north of rock springs Wyoming.

Cheers,
Scotsman
 
samoth said:
lol

AgNO3 + xcess KCL <-----> KNO3 (ppt) + AgCl

Given: 33.5 mL AgNO3, 0.680g KNO3
MW AgNO3 = 170g/mol, MW KNO3 = 101g/mol

(I usually carry sig figs through calculations)

First multiply through using the 1:1 mol rat to get the number of moles of reactant used. All molar and ionic quantities are 1:1, so that simplifies things:

0.680g KNO3 * (mol KNO3/ 101g KNO3) * (mol AgNO3/ mol KNO3) = 6.71x10^-3 mol of reactant AgNO3 used.

Then, using the definition M = mol/L:

M = mol/L = (6.71x10^-3)/(0.335 L) = 0.2M AgNO3 sol'n

Now, since the ionic compound Ag+ NO3- is in a 1:1 ratio, the molarity of Ag+ ions is also 0.2M.



It's been been a while since I've done this, so you might wanna verify the work. It seems kinda basic, so hopefully thier isn't something I overlooked. It's not a K(sp) problem, is it? It seems to be a basic 1:1 ppt ionicy-type problem.
Click to expand...

Bitch, wish I'd have seen this thread earlier, I'd have undercut yer answer. (but I'd have had to dig out an old chem text to do it, because I mindwiped my Chem droid years ago).
 
GoldenDelicious said:
well, the concussion ive had so far leave you feeling kind of scattered...sort of like that feeling you get the morning after going out and partying really really hard...trouble concentrating or getting into the mood for anything, as well as being forgetful as hell...im constantly losing my keys and my coffee around here today

another example is that i have no idea if the reply i just typed out is actually relevent. :(

jack_schitt: i just went to hit you. apparently i have to spread LOL ;)
Click to expand...
Thats about how it was when I got a concussion... It sucked. Mine was pretty bad though. I literally got knocked unconsious for a while and had no idea where I was or anything when I woke up. The funny part was when my girlfriend asked me if I knew who she was, and I said "no"... :worried: My spine was all screwed up as well, so that didn't help matters any...
 
I used to be able to do that, but that was two semesters ago, and we ALL know how that shit goes.
 
Scotsman said:
Harness belt broke, the pull back rope tangled him up so when the strap caught it broke his neck. He was tied off properly just a freak accident. Not sure the rig number but it was a DHS rig north of rock springs Wyoming.

Cheers,
Scotsman
Click to expand...

Damn. RIP brother. All derrickhands will always be brothers. Spent too much time on the board.
Hope work is going better Scots.
 
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