imqwerty
  • imqwerty
100ml H2SO4 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of H2SO4 solution, if final density is 1.25g/ml.
Chemistry
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SOLVED
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katieb
  • katieb
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hwyl
  • hwyl
first, make sure you have a good grasp of the definition of molarity
Adi3
  • Adi3
@imqwerty
imqwerty
  • imqwerty
well i know how to solve the question but i think the question is wrong

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Adi3
  • Adi3
well then type the correct question
hwyl
  • hwyl
then show your solution
imqwerty
  • imqwerty
ok 1st i'll show the solution and then i'll show how the question is wrong
imqwerty
  • imqwerty
Molarity=moles/volume(in lts.) for h2so4 :- 1M=n(moles)/0.1 n=0.1 total weight of final solution = 100 x 1.5 +400 = 550gm volume of final solution = 550/1.25 = 440ml = 0.440L molarity of h2so4 in final solution = 0.1/0.440 = 0.227M
imqwerty
  • imqwerty
it is given that the final density is 1.25g/ml the final mix has h2so4 and h2o total mass of final mixture as calculated above is = 550gm total volume of final mix. = vol. of h2so4 + vol. of h2o = 100+400 = 500 so final density of final solution = mass/volume = 550/500 = 1.1gm/ml but in the question the final density given is 1.25gm/ml now how is that possible??
hwyl
  • hwyl
when you dilute a solution, does the density increase or decrease?
imqwerty
  • imqwerty
it increases??
hwyl
  • hwyl
prove it mathematically
imqwerty
  • imqwerty
well i don't know how to do so??
hwyl
  • hwyl
can you use the density formula?
imqwerty
  • imqwerty
yes
hwyl
  • hwyl
then try
imqwerty
  • imqwerty
the way i showed that the final density is 1.1 is also correct.
imqwerty
  • imqwerty
@hwyl how will you prove that density is not 1.1 and its 1.25??
anonymous
  • anonymous
You are meant to calculate the concentration of H2SO4 and then to use that to find the final density of the solution and CHECK that it is 1.25.
anonymous
  • anonymous
Conentration = molarity
imqwerty
  • imqwerty
@ShizukaTheOtaku no we don't have to check whether the density given is correct or not rather we are given the density to find the molarity. But i wished to check whether the density given was correct or not and in the calculation above which i posted the density is comming out to be different from what is given in the question.

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