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imqwerty

  • one year ago

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.

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  1. hwyl
    • one year ago
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    first, make sure you have a good grasp of the definition of molarity

  2. Adi3
    • one year ago
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    @imqwerty

  3. imqwerty
    • one year ago
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    well i know how to solve the question but i think the question is wrong

  4. Adi3
    • one year ago
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    well then type the correct question

  5. hwyl
    • one year ago
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    then show your solution

  6. imqwerty
    • one year ago
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    ok 1st i'll show the solution and then i'll show how the question is wrong

  7. imqwerty
    • one year ago
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    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

  8. imqwerty
    • one year ago
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    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??

  9. hwyl
    • one year ago
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    when you dilute a solution, does the density increase or decrease?

  10. imqwerty
    • one year ago
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    it increases??

  11. hwyl
    • one year ago
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    prove it mathematically

  12. imqwerty
    • one year ago
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    well i don't know how to do so??

  13. hwyl
    • one year ago
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    can you use the density formula?

  14. imqwerty
    • one year ago
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    yes

  15. hwyl
    • one year ago
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    then try

  16. imqwerty
    • one year ago
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    the way i showed that the final density is 1.1 is also correct.

  17. imqwerty
    • one year ago
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    @hwyl how will you prove that density is not 1.1 and its 1.25??

  18. anonymous
    • one year ago
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    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.

  19. anonymous
    • one year ago
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    Conentration = molarity

  20. imqwerty
    • one year ago
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    @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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