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zaphod

  • 2 years ago

25 cm^3 of 2mol/dm^3 Sodium hydrixude solution and 25cm^3 of 2 mol/dm^3 Sulphuric acid were mixed well to make a solution X. Calculate the concentration of Sulphuric acid in the final solution..

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  1. zaphod
    • 2 years ago
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    @Callisto @TuringTest

  2. Callisto
    • 2 years ago
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    Sodium hydroxide?

  3. zaphod
    • 2 years ago
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    h2so4?

  4. Callisto
    • 2 years ago
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    Do you mean sodium hydroxide for ''Sodium hydrixude''?

  5. zaphod
    • 2 years ago
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    yh

  6. Callisto
    • 2 years ago
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    Can you write the chemical equation for the reaction first?

  7. zaphod
    • 2 years ago
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    2NaOH + H2SO4 ---> Na2SO4 + 2H20

  8. Callisto
    • 2 years ago
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    In this reaction, what is the limiting agent?

  9. zaphod
    • 2 years ago
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    limiting agent means? i found the answer it is 1 moldm^-3 cn u check it

  10. Callisto
    • 2 years ago
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    Hmm, I didn't get the same answer as you.

  11. zaphod
    • 2 years ago
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    can u shw ur working

  12. Callisto
    • 2 years ago
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    Perhaps I didn't do it correctly, since I haven't studied chemistry for quite a long time.. No. of mole of H2SO4 used = 1/2 (no. of mole of NaOH) = (1/2) (2x25/1000) = x *NaOH is the limiting agent that will be used up in the reaction. No. of mole of H2SO4 left = no. of mole of H2SO4 - no. of mole of H2SO4 used = (2x25/1000) - x = y Concentration of H2SO4 in the final solution = no. of mole of H2SO4 left / volume of the solution. And I take volume of the solution remains unchange, that is 25cm^3 + 25cm^3 = 50cm^3 Did I do anything wrong?

  13. zaphod
    • 2 years ago
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    This is how i did, check if im wrong 2NaOH + H2SO4 ---> Na2So4 +2 H20 the molar ratio is tht, 2 moles of NAOH reacts with 1 mole of H2so4 when u calculate the number of moles in each reactnt it is 0.05 mole, which means 0.05 mol of Naoh react with 0.025 mol of H2so4...so there is 0.025 mole of H2so4 left n = c*v/ 1000 0.025 = c * 25/1000 c = 1 mol dm^-3

  14. Callisto
    • 2 years ago
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    Why is it 25cm^3 for your volume?

  15. zaphod
    • 2 years ago
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    should it be 50 or 25?

  16. zaphod
    • 2 years ago
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    im not sure of this

  17. Callisto
    • 2 years ago
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    Hmm.. final solution, it's not just the volume of H2SO4, so I prefer using the total volume. But I'm not sure though. As I've said, I haven't studied chemistry for quite a long time!

  18. zaphod
    • 2 years ago
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    then the answer becomes 0.5 moldm^-3

  19. Callisto
    • 2 years ago
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    That's what I got. Sorry for the late reply

  20. zaphod
    • 2 years ago
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    so my method is right?

  21. Callisto
    • 2 years ago
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    The method is right, just the volume is not right/

  22. zaphod
    • 2 years ago
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    thanks alot :)

  23. Callisto
    • 2 years ago
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    Welcome :)

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