Limit Test of Iron | How to Perform Limit Test of Iron | Iron limit Test | आयरन लिमिट टेस्ट कैसे करे

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LIMIT TEST OF IRON
Limit = value or amount that is likely to be present in a substance
Test = to examine or to investigate
Impurities = a foreign matter present in a compound
Limit test is defined as a quantitative or semi-quantitative test designed to identify and control small quantities of impurity which is likely to be present in the substance. Limit test is generally carried out to determine the inorganic impurities present in the compound. In short, the limit test is nothing but to identify the impurities present in the substance and compare it with the standard.
Importance of Limit tests:
To find out the harmful amount of impurities
To find out the avoidable/unavoidable amount of impurities Limit test is defined as a quantitative or semi-quantitative test designed to identify and control small quantities of impurity which is likely to be present in the substance. Limit test is generally carried out to determine the inorganic impurities present in the compound.
LIMIT TEST OF IRON
Apparatus Required
Nessler cylinders, (50 ml), Glass rod, Stand
Chemicals Required
1.Standard Iron Solution: 0.1726 gm of ferric ammonium Sulphate and dissolve in 10ml of 0.1 N H2SO4 and sufficient water to produce 1000 ml.
2. 0.1 N H2SO4: 4.904 gm in 1000ml of water.
3. 20% Iron free citric acid.
4. Thioglycollic acid
5. Ammonia solution
Principle:
The test depends upon the reaction between ferrous iron and thioglycollic acid in the presence of ammonia. When a pale pink to deep reddish purple colour is produced. Ferric iron is reduced to ferrous iron by the thioglycollic acid and the compound produced is ferrous thioglycollate. Citric acid forms a soluble complex with iron and prevents its precipitation by ammonia as ferrous hydroxide. Ferrous thioglycollate is colourless in neutral or acid solutions. The colour develops only in the presence of alkali. It is stable in the absence of air but fades when exposed to air due to oxidation to the ferric compound. Therefore the colours should be compared immediately after the time allowed for full development of colours is over.
Procedure:
Test sample
1. Sample is dissolved in specific amount of water and then volume is made up to 20 ml.
2. Add 2 ml of 20 % w/v of citric acid (iron free).
3. Add 0.1 ml of thioglycollic acid
4. Add ammonia to make the solution alkaline and adjust the volume to 50 ml.
5. Keep aside for 5 min
6. Color developed is viewed vertically and compared with standard solution.
Standard compound
1. 2 ml of standard solution of iron diluted with water upto 20ml.
7. Add 2 ml of 20 % w/v of citric acid (iron free)
8. Add 0.1 ml of thioglycollic acid
9. Add ammonia to make the solution alkaline and adjust the volume to 50 ml.
10. Keep aside for 5 min
2. Color developed is viewed vertically
3. Earlier ammonium thiocyanate reagent was used for the limit test of iron. Since thioglycolic acid is more sensitive reagent, it has replaced ammonium thiocyanate in the test.
Observation:
The purple color produce in sample solution should not be greater than standard solution. If purple color produces in sample solution is less than the standard solution, the sample will pass the limit test of iron and vice versa.
Reasons:
Citric acid helps precipitation of iron by ammonia by forming a complex with it.
Thioglycolic acid helps to oxidize iron (II) to iron (III).
Ammonia to make solution alkaline
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[@adibkhanpathan3124]

This is exactly a comprehensive practical approach to limits tests. Curiosly insightful. You're a great teacher. Thanks ❤

[@solutionpharmacy]

Thank you so much

[@adibkhanpathan3124]

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[@hasnainkhan589]

Thank you mam.
Please provide "limit test for Arsenic"

[@30-shivangiyadav67]

Very nice your lecture mam 👍

[@shreyapandey1403]

Very nice practically mam thank you !

[@harshitpandey-nl6we]

Nice explanation mam

[@NM-mt5yv]

Pls tell about how to make test solution. What compound to be used for test solution?

[@mukrima8517]

????

[@mukrima8517]

Answer???

[@ShivamPal-sg5rk]

Shivam pal
Very nice practical ma'am

[@anujbhargava4792]

Ase make vedio on calculation that u do how make solution etc

[@saikrishnamrajubahatam8054]

How much quantity of ammonia is added .❓you're not mention the value...

[@pradeepSingh-jx8si]

2ml

[@basudevmishra1367]

Amonia 1 ml

[@pradip263]

2-3 drops then after check the pH of solution using pH paper
If pH paper doesn't turns blue then
Add more drops of ammonia and again check the pH of solution

[@aribakhan1128]

Plz make a video on limit test of Arsenic

[@monuvishwakarma6311]

Very useful video mam tnqs

[@ruhinverma6451]

Plz add English subtitle too. It will help us to make notes. Thanks. Like ur channel very much👌

[@solutionpharmacy]

Ruhin Verma Thank you. We will try to do so.

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Ya mam

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@@adityasangavkar2884 r4er4ew(

[@sonuvishwakarma703]

Thank you

[@biplovsarkar1109]

Very nicely made

[@kavitaborade4675]

Mam which sample you use for test solution

[@mubashshirakhan5633]

Helpful vedio

[@purvasawale1476]

Thank you mam this video is very useful in my study

[@sushmabendre8980]

Test madhe sample ky ghayche ahe

[@Abhishek-bo8vz]

Thanks ❤️🔥

[@NEWGEOGRAPHYBRO]

Thanks

[@PunjabiBLike]

Thxx so much ji

[@ghanshyamgupta4047]

Thank you mam ❤️

[@RohanKumar-bj4pk]

Ferrus ammoniaum sulphate Ka calculatio kaise Kia please bataiye

[@souvikdas2343]

Very helpful video

[@solutionpharmacy]

Thank you

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Amazing 😍....tysm mam

[@APEC67]

Nice lacture madam

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[@sahilpatil8894]

Mam please provide standardization of 0.1 M sodium hydroxide

[@AmitTrivedi-w7y]

Maam test solution me sample kya hota hai

[@nayansoni2113]

Very nice👍👍👍👍

[@solutionpharmacy]

Thank you

[@nileshyadav-qj1jb]

Maim tell me how did you calculate balance of ingredients

[@anujbhargava4792]

Calculation sikhao mam

[@APEC67]

arsenic ka bhi bna do madam ji

[@vishalchaurasia5496]

In ferrous ammonium sulphate, iron is present in form of ferrous ion not in form of ferric iron..

[@nileshyadav-qj1jb]

Mai tell me how you calculated

[@33kusumitavishwakarma20]

In description you have mentioned ferrous hydroxide and I video you said ferrous oxide. Which one is correct?

[@rahulplayz007]

What are calculation mam fo 20 ml of standard iron solution plz. Anyone tell

[@uniqueashu1048]

Thank you mam

[@mahimagupta507]

Mam or bhi limit test ke baare me bta dijiye plz limit test of lead, arsenic, anion cation in the salt sample,

[@dpsgaming3541]

thanx sir

[@prabhudattasatapathy6459]

Thanks mam

[@ranijakkala1259]

Mam, in test which sample not mention?

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Thanks mem ..pls help me..can u tell me about stock solution.nd buffer solution

[@himabindu4232]

Mam please tell ,how test solution is prepared ?

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Mam please calculations kaise kiya batao🙏🙏

[@pandit_atul.mishra]

Limit test for arsenic. Ka video?

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mam inorganic quantitative analysis? video

[@solutionpharmacy]

Will try

[@ateekmohammad9597]

Quantity of ammonia

[@VivekSingh-gg4fv]

Ammonia kitne quantity me lena h

[@30-shivangiyadav67]

Mam Hap qusstion plzz tell m...

[@gouravgarg6113]

Thanku mam

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Mam ji whare is video of limit test for arsenic ?

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Mam plz jaldi se jaldi In topics pr vedio upload kr dijiye plz plz mam

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Ppm solution kese bnaate he describe kare

[@RohanKumar-bj4pk]

Ha madem dataiye

[@RohanKumar-bj4pk]

Aap ne kaise calculate kiya

[@nirbhaygiradkar2925]

Sample konsa dalna hai aur kitna dalna hai

[@solutionpharmacy]

Koi sa bhi compound jisme iron ho

[@nirbhaygiradkar2925]

@@solutionpharmacy mam please give me some examples with required quantity as per IP

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What it acid plz tl me

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maim limit test of arsenic ka vidio plzz

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Mam limit test of arsenic ka video plzz

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Aqueous solution kaise bnate h

[@solutionpharmacy]

Water me dissolve karke...

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Madam ji aap ek help kar sakti ho meri kiya please reply zaroor de

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This channel is regulated and replied by me (Cology sir) she never replied

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Test solutio kya ta

[@arunpatil1441]

Please reply...what is test solution

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Engilsh speak...

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Hap video bano

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Thank you

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@@solutionpharmacy there is a option in TH-cam to slow down the speed ,
But either way it wasn't so fast many people understood clearly

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Thank you

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Thanks

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Thank you

[@solutionpharmacy]

Taki Tachibana my pleasure