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Sorry wanaJF: Nahitaji kuandaa 3M NaOH kwa ajili ya shughuli fulani

Discussion in 'Jukwaa la Elimu (Education Forum)' started by Mbayuwayu2008, Jul 17, 2011.

  1. M

    Mbayuwayu2008 Member

    #1
    Jul 17, 2011
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    Naomba mnisaidie wanaJF kuweza kuandaa hii soln ya (1) 3M NaOH in 500ml, (2) 0.5% Tween-20 from 1%Tween-20
    Thanx
     
  2. Gobret

    Gobret JF-Expert Member

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    Jul 17, 2011
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    Tumia njia ifuatayo, utafanikiwa kupata unachokitahitaji:
    (1) 3M NaOH
    Molarity of NaOH in (M) or (Mol/L) X Molar mass of NaOH (g/mol)= Conc. of NaOH in g/L
    3Mol/L X 40g/mol= xg/0.5L
    x= (120X0.5)g
    = 60g
    Kwa hiyo ni kusema pima gramu 60 za NaOH na uzichanganye na nusu lita ya maji (distilled water); utakuwa umepata 3M NaOH

    (2) C1V1=C2V2
    1% X V1= (0.5%) X kiasi cha ujazo unaohitajika kuandaa (V2)
    V1= 0.5% X V2/1% e.g V2= 500ml
    = 0.5% X 500ml/1%
    = 250ml
    Kwa hiyo pima 250ml ya 1% Tween-20 na uongeze ujazo hadi kufikia 500ml kwa kutumia maji (distilled water) i.e 250ml 1% Tween 20 + 250ml za maji.

    Kila la kheri
     
  3. A

    Apta Kayla JF-Expert Member

    #3
    Jul 17, 2011
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    Watu na profession zao, duh!
     
  4. Ozzie

    Ozzie JF-Expert Member

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    Sio kazi ngumu, chemistry ya A level inatosha...
     
  5. yutong

    yutong JF-Expert Member

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    hii 120 ni nini kaka na 1% imetoka wapi maelezo please
     
  6. G

    Gad ONEYA JF-Expert Member

    #6
    Jul 17, 2011
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    Shughuli fulani? Nitarudi baadaye.....
     
  7. M

    Malila JF-Expert Member

    #7
    Jul 17, 2011
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    Safi sana mkuu

     
  8. C

    Chief Lugina JF-Expert Member

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    Kuna jukwa la Tech,gadges &Science,next time nenda huko sisi hapa tuna deal na siasa tu...! Yaani unategemea aliyesoma HKL achangie nini sasa hapa?
     
  9. JamboJema

    JamboJema JF-Expert Member

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    Jukwaa hili jamani, duh! Kama hii ndo siasa tumekwisha!
     
  10. Perry

    Perry JF-Expert Member

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    Mimi niko ungwinini huku,so hapo naona nyota 2.
     
  11. Anheuser

    Anheuser JF-Expert Member

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    Jul 17, 2011
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    The GLP (good laboratory practice).

    Chukua 500mL volumetric flask, weka DI (De-Ionized) water up to meniscus. Dumbukiza magnetic bar na uanze kuizungusha juu ya stirring plate. Chukua weighing boat, weka kwenye analytical balance, halafu tear the balance. Pima 60g NaOH into the boat, mwaga NaOH flask and tap the boat. (The Math imeshanyesha na waungwana.) Shake the flask by inventing it 5 times. Rudisha juu ya stirrer i mix mpaka uone a clear solution, and a couple of more minutes. Pima the emptied boat, ili ujue ni kiasi gani cha NaOH exactly kiliingia.

    Calculate the actual molarity based on the measured NaOH iliyoingia, pamoja na Molarity iliyowekwa kwenye chupa, sio 40g/M, hiyo ni theorty. Na urekodi. Hiyo exact molarity ndio ui submit, sio 3M NaOH, unaweza usipate exactly 3.00M NaOH.

    Rekodi ulichokifanya mwanzo mwisho kwenye daftari la lab, ukijumuisha calibration and validation dates za balance pamoja na mashine ya water dionization, pia rekodi expiration date ya NaOH na chemical identification number ambayo inakua assigned kwa kila chupa ndani ya Lab, kama ni GLP au GMP lab.

    +++++++++++++++++++++++++++++++++++++++++++++++++

    Tween-20 is a solution, so going from 1% to 0.5% is a 1-to-2 dilution. So, measure 250ml of 1%Tween into measuring cylinder, add it into a 50ml flask. Fill the 50ml flask to meniscus with DI water. Invert 5 times, stir on a stirring plate. Record the validation and calibration date of the dionization equipment, and the expiration date of the Tween-20, plus the chemical identification nummber of the Tween from the bottle.

    Rekodi tarehe ya tukio. Bandika label kwenye flask inayoonyesha tarehe uliyotayarisha, initials zako, expiration date na concetration ya solution.


    Note: Katika mazingira halisi kwenye maabara isiyokuwa ya ki-academia utatakiwa kutumia validated SOP (Standard Operation Procedure) inayoeleza mchakato mzima wa kutengeneza chemical mbali mbali, hata kama unajua. Hii ya kujitungia ni mazingira ya kishule shule. Hivyo, ukiulizwa swali kama hilo kwenye kitu kama interview, anza kwa kusema, nitaomba validated SOP kwa aliyenituma kazi, kama ipo.
     
  12. King'asti

    King'asti JF-Expert Member

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    hata sina hamu na haya makemia! sijui nilikuwa napitaje,duh! im glad kila mtu ana kazi yake,ukitupa lab huko wanajiju! hongereni vijana!
     
  13. T

    The Priest JF-Expert Member

    #13
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    Thats why i love science,haina chai wala ungwini.
     
  14. figganigga

    figganigga JF-Expert Member

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    Jul 17, 2011
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    mi nilijua anaongelea NOAH gari.duh!kumbe hajachapia ni naOH.ok basi.ntarudi baadae,ngoja nikawaleteeni catalyst ya kuincrease the rate of your chemical reaction.mia
     
  15. Gobret

    Gobret JF-Expert Member

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    Jul 17, 2011
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    120 imetokana kwa kuzidisha 3M X 40g/M. Na 1%Tween-20 ni conc (v/v) ya stock soln (soln uliyonayo stoo). Lakini wewe unahitaji soln ya 0.5% kutoka hiyo uliyonayo stoo.

    Actually, Anheuser amejitahidi kuonyesha kivitendo lkn kazi si rahisi kiasi hicho lazima ujue unatafuteje kiasi halisi kwa hiyo ni vizuri ukajua hizo formula zitakusaidia.

    Pili, ndugu yangu Anheuser kwenye kupima 250ml za 1% Tween-20 huzimimini kwenye 50ml flask bali 500ml flask. Nadhani utakuwa hujaangalia vizuri.

    Good. Asante.
     
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