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ashna

molarity and molality !

  • one year ago
  • one year ago

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  1. waterineyes
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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 ??

    • one year ago
  2. ashna
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    solvent is water and solute is that 2g substance .. correct ?

    • one year ago
  3. waterineyes
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    Yes..

    • one year ago
  4. waterineyes
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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.. ??

    • one year ago
  5. ashna
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    i dont know !

    • one year ago
  6. waterineyes
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    For that there is a formula you will use that..

    • one year ago
  7. ashna
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    ah .. that previous one ?

    • one year ago
  8. ashna
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    derived from molarity .. ?

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

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

    • one year ago
  11. ashna
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    how many formulas are there in this chapter ?

    • one year ago
  12. waterineyes
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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..

    • one year ago
  13. ashna
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    what if am bald ?? :P

    • one year ago
  14. waterineyes
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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..

    • one year ago
  15. ashna
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    okay !

    • one year ago
  16. waterineyes
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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..

    • one year ago
  17. ashna
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    am not bald either .. i were just kidding :)

    • one year ago
  18. ashna
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    |dw:1345436660852:dw|

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

    • one year ago
  20. ashna
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    yeah back !

    • one year ago
  21. ashna
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    @waterineyes

    • one year ago
  22. waterineyes
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    I have to go ashna...

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

    • one year ago
  24. ashna
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    okay

    • one year ago
  25. waterineyes
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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..

    • one year ago
  26. waterineyes
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    Hurry up find the molecular mass of NaCl first..

    • one year ago
  27. waterineyes
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    Because you have to find Number of Moles first..

    • one year ago
  28. ashna
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    23+35.5 ?

    • one year ago
  29. waterineyes
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    Yep...

    • one year ago
  30. waterineyes
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    so it is 58.5..

    • one year ago
  31. ashna
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    58.5

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

    • one year ago
  33. ashna
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    2 / 58.5

    • one year ago
  34. waterineyes
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    Yep solve it hurry up..

    • one year ago
  35. ashna
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    0.034...

    • one year ago
  36. waterineyes
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    Yep..

    • one year ago
  37. waterineyes
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    Now can you find molarity by using its formula ??

    • one year ago
  38. waterineyes
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    For that you need volume of solution too..

    • one year ago
  39. ashna
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    0.034 / 4

    • one year ago
  40. waterineyes
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    For that you need volume of solution too..

    • one year ago
  41. waterineyes
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    No..

    • one year ago
  42. ashna
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    then ?

    • one year ago
  43. waterineyes
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    I don't know.. Ha ha ha..

    • one year ago
  44. waterineyes
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    Yes we can ashna..

    • one year ago
  45. ashna
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    okay .. you leave then !

    • one year ago
  46. waterineyes
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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: \[Density = \frac{Mass}{Volume}\]

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

    • one year ago
  48. ashna
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    you better leave water ..

    • one year ago
  49. waterineyes
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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...

    • one year ago
  50. ashna
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    hm..

    • one year ago
  51. waterineyes
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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 ??

    • one year ago
  52. ashna
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    yes

    • one year ago
  53. waterineyes
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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..

    • one year ago
  54. ashna
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    hm.. bye

    • one year ago
  55. waterineyes
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    Bye take care as well..

    • one year ago
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