# 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

### Mbayuwayu2008Member

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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. ### GobretJF-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 KaylaJF-Expert Member

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Watu na profession zao, duh!

4. ### OzzieJF-Expert Member

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

5. ### yutongJF-Expert Member

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

6. G

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7. M

### MalilaJF-Expert Member

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Safi sana mkuu

8. C

### Chief LuginaJF-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. ### JamboJemaJF-Expert Member

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Jukwaa hili jamani, duh! Kama hii ndo siasa tumekwisha!

10. ### PerryJF-Expert Member

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Jul 17, 2011
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Mimi niko ungwinini huku,so hapo naona nyota 2.

11. ### AnheuserJF-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.

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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'astiJF-Expert Member

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Jul 17, 2011
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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 PriestJF-Expert Member

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Thats why i love science,haina chai wala ungwini.

14. ### figganiggaJF-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. ### GobretJF-Expert Member

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Jul 17, 2011
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