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dddan
 2 years ago
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?
dddan
 2 years ago
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?

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

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

ethayer
 2 years ago
Best ResponseYou've already chosen the best response.1I 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)

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

ethayer
 2 years ago
Best ResponseYou've already chosen the best response.1just 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.

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

ethayer
 2 years ago
Best ResponseYou've already chosen the best response.1try 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?

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

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

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

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

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