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dddan
Group Title
please help!;
Assuming additivity of volumes, what is the concentration of KBr(in moles/L) in a solution prepared by mixing 2.50x10^2 of 0.0600 Molarity of KBr with 5.00x10^2 ml of 0.0830 Molarity?
 2 years ago
 2 years ago
dddan Group Title
please help!; Assuming additivity of volumes, what is the concentration of KBr(in moles/L) in a solution prepared by mixing 2.50x10^2 of 0.0600 Molarity of KBr with 5.00x10^2 ml of 0.0830 Molarity?
 2 years ago
 2 years ago

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ethayer Group TitleBest ResponseYou've already chosen the best response.1
is the first one in mL too?
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
yea the 2.50x10^2 is in ml
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
I think this is how you do it. 1st: change the mL into L (since M is in mol/L) 2nd: calculate the number of moles of KBr in each solution (M * L from above) 3rd: add the 2 numbers for moles together 4th: add the 2 numbers for volume together 5th: divide since you now have total moles and total volume (M = moles/L)
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
let me know what you get.
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
just a way to check, your answer should be inbetween the two given molarities since you are mixing them together and it should be a little closer to the larger molarity since you start with more of it.
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
alright i got a 5.2 Molarity does this sound right?
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
try again. It should be between .6M and .083M since those are the values you started with and you are mixing the same compound. What did you get for your 2 new volumes?
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
^sorry, .06M not .6
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
great! now what about for the moles of KBr found in each solution (molarity * liters = moles)?
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
i got .15 and 0.0415....
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
the first one should be .015...
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
alright hold on
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
ya your right its .015
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
alright! now when you add up your volumes what do you get? also what do you get when you add up the moles?
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
alright then i got .075 as final answer
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
correct! .0565mol/ .75L
 2 years ago

dddan Group TitleBest ResponseYou've already chosen the best response.0
thanks so much!!!
 2 years ago

ethayer Group TitleBest ResponseYou've already chosen the best response.1
your very welcome!
 2 years ago
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