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ashna

  • 3 years ago

molarity and molality !

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  1. waterineyes
    • 3 years ago
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    See there your question is given like: 2g of a Substance is added to water... Can you tell me what is solute here and what is the solvent here ??

  2. ashna
    • 3 years ago
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    solvent is water and solute is that 2g substance .. correct ?

  3. waterineyes
    • 3 years ago
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    Yes..

  4. waterineyes
    • 3 years ago
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    For finding molarity you need number of moles solute.. How will you find number of moles of solute because it is given in 2 grams.. ??

  5. ashna
    • 3 years ago
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    i dont know !

  6. waterineyes
    • 3 years ago
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    For that there is a formula you will use that..

  7. ashna
    • 3 years ago
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    ah .. that previous one ?

  8. ashna
    • 3 years ago
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    derived from molarity .. ?

  9. waterineyes
    • 3 years ago
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    \[Number \; Of \; Moles = \frac{Grams \; Present}{Molecular \; Mass \; Of \; that \; Substance}\]

  10. waterineyes
    • 3 years ago
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    No no that one.. This one I have written above now..

  11. ashna
    • 3 years ago
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    how many formulas are there in this chapter ?

  12. waterineyes
    • 3 years ago
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    Now let us try to implement this formula on a question so that you can understand it properly. There are as many formulas as there are hairs on your head.. Ha ha ha..

  13. ashna
    • 3 years ago
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    what if am bald ?? :P

  14. waterineyes
    • 3 years ago
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    Wait for one second my mummy is calling me.. Have a look on that formula and try to memorize it and understand it as well..

  15. ashna
    • 3 years ago
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    okay !

  16. waterineyes
    • 3 years ago
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    Then there are as many formulas as there are hairs on my head And I don't like to be bald..

  17. ashna
    • 3 years ago
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    am not bald either .. i were just kidding :)

  18. ashna
    • 3 years ago
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    |dw:1345436660852:dw|

  19. waterineyes
    • 3 years ago
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    Mention me when you will come.. I am in Mathematics Section..

  20. ashna
    • 3 years ago
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    yeah back !

  21. ashna
    • 3 years ago
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    @waterineyes

  22. waterineyes
    • 3 years ago
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    I have to go ashna...

  23. waterineyes
    • 3 years ago
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    So let us hurry up I can explain you this thing..

  24. ashna
    • 3 years ago
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    okay

  25. waterineyes
    • 3 years ago
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    See you are given with question like this: 2g of a NaCl is dissolved in 4 L of water.. Find the Molarity..

  26. waterineyes
    • 3 years ago
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    Hurry up find the molecular mass of NaCl first..

  27. waterineyes
    • 3 years ago
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    Because you have to find Number of Moles first..

  28. ashna
    • 3 years ago
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    23+35.5 ?

  29. waterineyes
    • 3 years ago
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    Yep...

  30. waterineyes
    • 3 years ago
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    so it is 58.5..

  31. ashna
    • 3 years ago
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    58.5

  32. waterineyes
    • 3 years ago
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    Now 2g you are given with.. Can you find number of moles now ??

  33. ashna
    • 3 years ago
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    2 / 58.5

  34. waterineyes
    • 3 years ago
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    Yep solve it hurry up..

  35. ashna
    • 3 years ago
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    0.034...

  36. waterineyes
    • 3 years ago
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    Yep..

  37. waterineyes
    • 3 years ago
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    Now can you find molarity by using its formula ??

  38. waterineyes
    • 3 years ago
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    For that you need volume of solution too..

  39. ashna
    • 3 years ago
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    0.034 / 4

  40. waterineyes
    • 3 years ago
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    For that you need volume of solution too..

  41. waterineyes
    • 3 years ago
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    No..

  42. ashna
    • 3 years ago
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    then ?

  43. waterineyes
    • 3 years ago
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    I don't know.. Ha ha ha..

  44. waterineyes
    • 3 years ago
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    Yes we can ashna..

  45. ashna
    • 3 years ago
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    okay .. you leave then !

  46. waterineyes
    • 3 years ago
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    For that you should know the density of water.. It will be given to you.. I think approximately density of water is 1.. So: \[Density = \frac{Mass}{Volume}\]

  47. waterineyes
    • 3 years ago
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    Oh god what I am doing.. We have to find volume of NaCl not water..

  48. ashna
    • 3 years ago
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    you better leave water ..

  49. waterineyes
    • 3 years ago
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    Yeah but I will explain you after coming for sure.. May be till then others may help you.. Or I think I have written the question wrong...

  50. ashna
    • 3 years ago
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    hm..

  51. waterineyes
    • 3 years ago
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    But the main concept is you got how to find number of moles of solute when it is not given.. Right ??

  52. ashna
    • 3 years ago
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    yes

  53. waterineyes
    • 3 years ago
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    It did increase some knowledge of yours. Okay now I have to leave.. There is work for me from my neighborers.. So I have to go now..

  54. ashna
    • 3 years ago
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    hm.. bye

  55. waterineyes
    • 3 years ago
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    Bye take care as well..

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