Recent content by sergey_le

  1. sergey_le

    Common ion in solution

    my approach is wrong or the one in the lasts year lab report?
  2. sergey_le

    Common ion in solution

    Summary:: finding concetrations [Thread moved from the technical forums] i did a lab experiment and i'm a little confused about what i should do. i got a solution of CaCl(2) 1.5 gr and Ca(OH)2 5gr in 100ml that i prepared 2 weeks ahead . after filttering the solution i got a saturated...
  3. sergey_le

    Chemical kinetics lab question

    last week i did a chemistry lab. i mixed NaOH 0.03M with equal part of methyl violet and mesured aborbance in a spectrophotometer. then i did the same thing with a 0.05M and methyl violet i did today the graphs and got the k' =-0.1647 for the first solution and k'=-0.4022 for the second...
  4. sergey_le

    Calculations involving acids and bases

    i found the pka=4.8 so the ka is 1.58*10^-5. i guess the big issue i have is understanding what equation i should use. i attached what idid so far ,can you give it a look and tell me where i am wrong?
  5. sergey_le

    Calculations involving acids and bases

    Summary:: finding ml of two solutions by the final pH i have a NaOAc 0.1M and HOAc 0.1M , together the volume of the solutions is 20ml and the pH is 4. I need to find the volume of each solution. I've tried to solve it for hours with no successes. i found the H+ concentration (-log(h)=4 ), it...
  6. sergey_le

    The most likely structure from combinations of these atoms

    an element (we will call it X) got a cofiguration of 1##s^2##2##s^2##2##p^6##3##s^2##s##p^3## what molecule is moste likely to happend between this element and Mg? 1.MgX 2.##Mg_2##X 3.Mg##X_2## 4.##Mg_3## ##X_2## how do i do it?with lewis structure?just check what structure makes the most...
  7. sergey_le

    Prove that this function is nonnegative

    Thanks so much I finally realized
  8. sergey_le

    Prove that this function is nonnegative

    Yes I'm sorry. I don't know why I make such mistakes
  9. sergey_le

    Prove that this function is nonnegative

    why x=3/2+πk is not a solution?
  10. sergey_le

    Prove that this function is nonnegative

    Yes I know how to solve it x(1 + sin(x)) = 0 when x=0 or x=3/2+πk
  11. sergey_le

    Prove that this function is nonnegative

    You mean I have to show that there is no f' axis with x axis?
  12. sergey_le

    Prove that this function is nonnegative

    nothing special. Please direct me
  13. sergey_le

    Prove that this function is nonnegative

    I'm sorry I don't understand what you want to say
  14. sergey_le

    Prove that this function is nonnegative

    Also the derivative f'(x)≥0 I don't understand what you want me to do? How do I show that f'(x)>0 And no ≥
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