Hello, this method is still valuable if we use anhydrous sodium thiosulfate instead of penhydrated sodium thiosulfate ? and if it's yes, in this case the preperation of thiosulfate sodium expected molarity will be 0.158 g in 10 ml is it right ?
I am following IP method of preparation and standardization. Here instead of Potassium dichromate, potassium bromate is being used. How to calculate the Factor? The method as per Indian Pharmacopoeia is as follows: "Dissolve 0.200g of potassium bromate, weighed accurately, in sufficient water to produce 250.0 ml. To 50.0 ml of this solution add 2 gm of potassium iodide and 3 ml of 2(M) hydrochloric acid and titrate with 0.1(M) Sodium Thiosulphate solution {Test} using starch solution, added towards the end of the titration, as indicator until the blue color is discharged. 1ml of 0.1(M) sodium Thiosulphate is equivalent to 0.002784g KBrO3." Please help.
Viral Fam, Thank you for your comment. There is no official method of Fiber content determination where filter paper is used & Furnace is not used. Anyways we followed the AOAC method strictly.
No no...It will not become colorless. Blue color will be removed completely and Green color will appeare as shown in my video. I followed AOAC method strictly. So don't keep any confusion regarding this procedure.
The potency or purity of a chemical decreases with the increased number of expiry date. Ofcourse it's better to use a chemical withing it's shelf-life. But normally we have seen that: using a chemical, which was expired 1 year past, does not affect significantly in the test result though it varies with the type of test. You can use a expired chemicals after standardization but not in sensitive tests those are done using HPLC, GC, AAS etc. And reference standards should not be used after the expiry date. I think your got my point.
How about standardization of 0.005N soudium thiosulphate? The preparation pf potassoim dichromate is still the same? Would the % of potassium iodide solution affect?
Free fatty acids (FFA) are produced by the hydrolysis of oils and fats. Since FFA are less stable than neutral oil, they are more prone to oxidation and to turning rancid. Thus, FFA is a key feature linked with the quality and commercial value of oils and fats.
20.394 is the factor of the equation. In case of sodium thiosulfate, normality and molarity is same. 1M sodium thiosulfate= 1N sodium thiosulfate. So same procedure should be followed to prepare 0.1N solution.
@@MicroChemsExperiments It's the chemical reactions Stoichiometry: (294.185 g/mol K2CR2O7)*(1 mol K2CR2O7/3mol I2)* (1 mol I2/ 2 mol Na2S2O3)= 49.032 or 0.049032 in AOAC (denominator) or 20.394 if it is in numerator ( 1 mol K2CR2O7/ 294.185 g)
@@alifahimalshalaan9021(294.185 g/mol K2CR2O7)*(1 mol K2CR2O7/3mol I2)* (1 mol I2/ 2 mol Na2S2O3)= 49.032 or 0.049032 in AOAC (denominator) or 20.394 if it is in numerator ( 1 mol K2CR2O7/ 294.185 g)
This video is made based on AOAC method. So the calculation and the factor-20.394 are given by AOAC, hence no explanation is available to us. We used 0.169g potassium dichromate to dissolve in 25ml water, as said in AOAC. Molarity of potassium dichromate is not concern here. So calculate the molarity by yourself by using the molecular weight, if you need to know. Thank you
It's the chemical reactions Stoichiometry: (294.185 g/mol K2CR2O7)*(1 mol K2CR2O7/3mol I2)* (1 mol I2/ 2 mol Na2S2O3)= 49.032 or 0.049032 in AOAC (denominator) or 20.394 if it is in numerator ( 1 mol K2CR2O7/ 294.185 g) to calculate the M of K2CR2O7 just divide it with the total volume of solution prepared
Wishes from NIT,Nagpur! You're doing a good job. Thank you so much!
It's my pleasure. Keep supporting us.
Can you explain where is 20.394 from?
1000/49.03
What is 20.394? Please explain..
Time stamp:
Step-01: 0:27
Step-02: 02:24
Step-03: 04:19
Step-04: 07:23
Step-05: 10:14
Thanks
0.1 N = 0.01N ( for determine PV) is that same???
Hello, I have one question, why after I adding the starch the blue-black color of solvent become pale yellow not colourless?
I would also like to know!
This was helpful. Thank you, It Worked.
You're welcome!
Your all of video is very essential
Thank you so much. Keep supporting us.
It's too helpful for us thanku☺
You are welcome
Where is that 20.something coming from on the formulae
Hello, this method is still valuable if we use anhydrous sodium thiosulfate instead of penhydrated sodium thiosulfate ? and if it's yes, in this case the preperation of thiosulfate sodium expected molarity will be 0.158 g in 10 ml is it right ?
Yes. You are correct.
In some videos I have seen that a pinch of Na2CO3 is also put in the solution. What is the purpose of Na2CO3?
Addition of Na2CO3 helps to trigger the decomposition of thiosulfate.
But if you dont use, it will not cause any major problm in your experiment.
What is 20.394 stand for? Please let me know 😢
I am following IP method of preparation and standardization. Here instead of Potassium dichromate, potassium bromate is being used. How to calculate the Factor?
The method as per Indian Pharmacopoeia is as follows:
"Dissolve 0.200g of potassium bromate, weighed accurately, in sufficient water to produce 250.0 ml. To 50.0 ml of this solution add 2 gm of potassium iodide and 3 ml of 2(M) hydrochloric acid and titrate with 0.1(M) Sodium Thiosulphate solution {Test} using starch solution, added towards the end of the titration, as indicator until the blue color is discharged.
1ml of 0.1(M) sodium Thiosulphate is equivalent to 0.002784g KBrO3."
Please help.
No factor is needed. Just follow your last sentence for the calculation (1ml sodium thiosulfate=0.002784g KBrO3.)
0.1M =0.1N is it correct if it is corrected what is n factor of hypo
Why starch filtered before use
Can we use potato or corn starch??
Superb video👍
Someone video to new fiber content method to use filter paper and without use (muffle furnace).
Viral Fam, Thank you for your comment.
There is no official method of Fiber content determination where filter paper is used & Furnace is not used.
Anyways we followed the AOAC method strictly.
Dear medam to please post the to calculate the amount of sulphate present in the given sample.the sample maybe like a water or waste treatment water
Okay. We will try
is the standardization of sod. thiosulphate crucial to find PV value?
Yes.
What is hypo solution &
How to prepare?
Take help from Google
The factor is actually 20.395, but I don't know why AOAC used 20.394.
thanks dear 👍
You are welcome
I am having a confusion regarding the end point colour. Does it comes bottle green as in your video or colourless ?
No no...It will not become colorless.
Blue color will be removed completely and Green color will appeare as shown in my video.
I followed AOAC method strictly. So don't keep any confusion regarding this procedure.
Thank you for your response. Will there be any difference if I add HCl instead of H2SO4 or vice versa?
@@prasannamuley1917 you have to use HCl as AOAC says to use it. We dont have any other option to replace HCl.
Could you please suggest which AOAC volume to refer for analysis ?
@@prasannamuley1917 Volume 2, 19th edition
I have one doubt , if the standards used are expired, what is the probability to get the endpoint??? Still we can get the results???
The potency or purity of a chemical decreases with the increased number of expiry date. Ofcourse it's better to use a chemical withing it's shelf-life.
But normally we have seen that: using a chemical, which was expired 1 year past, does not affect significantly in the test result though it varies with the type of test.
You can use a expired chemicals after standardization but not in sensitive tests those are done using HPLC, GC, AAS etc.
And reference standards should not be used after the expiry date.
I think your got my point.
Hi
What does the value of 20.394 . represent?
It is a calculation factor given by AOAC official method.
@@MicroChemsExperiments thank you
@@MicroChemsExperiments excuse me AOAC?
@@alifahimalshalaan9021 Yes. AOAC
@@MicroChemsExperiments Sorry ; Is this a law or a general rule? Can you get more details?
0.02 M kmno4 procedure as per IP..how to calculate.... molarity
Noted.
No reply
How about standardization of 0.005N soudium thiosulphate? The preparation pf potassoim dichromate is still the same? Would the % of potassium iodide solution affect?
Same
Please make video for Assay of Potassium Chloride, Sodium Bi Carbonate & Assay of Ammonium Bi Carbonate
Noted. We will work on your mentioned parameter.
Stay with us.
Mam 5 n HCl standard and preparing
Your question is not clear
What's is 20.394?
It is a calculation factor given by AOAC.
What is 20.394 pls tell us
It is calculation factor given by AOAC METHOD
Nice vedio
Thank you
Please make video on phosphorus analysis by chemical methods..
Ammonium molybdate test
Will try. Thank you.
Here is a secret thing, why you did not mentioned weight taken of sodium thiosulfate?
How to make silver
It is a natural resource. You can't made it. You can purchase a bowl made of silver and then melt it by heating to collect silver from it.
Thanks so much
You are welcome
@@MicroChemsExperiments Can i use this steps to standardize 0.005N of sodium thiosulfate??
Why take k2cr2o7 0.16-0.22 gm?.calculation is =48*0.1*25/1000
=0.12 gm
AOAC said so
Pls prepare & standardization of 0.1M EDTA SOLN IN 1000ML VOLUMETRIC FLASK
Noted
ቆማላት ዓጋመ። ናይ የካቲት ዓሰርተ ሓደ ሕስቡ። ደቂ ሽራሙጥ። ወያነ ዕንጨቲ ብማዓኾርኩም ሚስ ኣእተዉልኩም፣ ማዓኾርኩም ገፊሑ ሓንጎልኩም ጸቢቡ። ቆማላት ዓጋመ። ስብኡት እንተኼንክን ወይ ንኤርትራ ውይ ን ኣዲስ ኣበባ እተዋ። ደቂ ሽራሙጥ።
Molecular WT of potassium dicromate is. 294.18 than why you have taken. 20.39. Mg
We followed the method of AOAC 993.20 for this preparation and standardisation strictly
20.394 Kya hai
i need 0.1N
0.1N are also includes same procedure
What is 20.394
Calculation factor
Free fatty acid defination.
Free fatty acids (FFA) are produced by the hydrolysis of oils and fats. Since FFA are less stable than neutral oil, they are more prone to oxidation and to turning rancid. Thus, FFA is a key feature linked with the quality and commercial value of oils and fats.
20.394 क्या है
Like it
Thank you
20.349?? Pls
It is calculation factor
20،349 from where get
Calculation factor given by AOAC method
@@MicroChemsExperiments can you explain in video plz
Wonderful video! What is the number 20.394 in the calculation?
How to convert to N (normality)?
Thanks!
20.394 is the factor of the equation. In case of sodium thiosulfate, normality and molarity is same. 1M sodium thiosulfate= 1N sodium thiosulfate.
So same procedure should be followed to prepare 0.1N solution.
@@MicroChemsExperiments 20.394 = ?
@@alifahimalshalaan9021 It is a calculation factor given by AOAC official method.
@@MicroChemsExperiments It's the chemical reactions
Stoichiometry: (294.185 g/mol K2CR2O7)*(1 mol K2CR2O7/3mol I2)* (1 mol I2/ 2 mol Na2S2O3)= 49.032 or 0.049032 in AOAC (denominator) or 20.394 if it is in numerator ( 1 mol K2CR2O7/ 294.185 g)
@@alifahimalshalaan9021(294.185 g/mol K2CR2O7)*(1 mol K2CR2O7/3mol I2)* (1 mol I2/ 2 mol Na2S2O3)= 49.032 or 0.049032 in AOAC (denominator) or 20.394 if it is in numerator ( 1 mol K2CR2O7/ 294.185 g)
Mem in sab ki hindi mai pdf sent kra do prepration and standard ki
Sorry we don't have any hindi pdf
🙏🏻👍🏻
Thank you
In last Calculation what is 20.394
M1V1=M2V2
Is used so What is Molarity you used in flask Of potassium dichromate.??
How mucht is v2?
This video is made based on AOAC method. So the calculation and the factor-20.394 are given by AOAC, hence no explanation is available to us. We used 0.169g potassium dichromate to dissolve in 25ml water, as said in AOAC. Molarity of potassium dichromate is not concern here. So calculate the molarity by yourself by using the molecular weight, if you need to know. Thank you
It's the chemical reactions Stoichiometry: (294.185 g/mol K2CR2O7)*(1 mol K2CR2O7/3mol I2)* (1 mol I2/ 2 mol Na2S2O3)= 49.032 or 0.049032 in AOAC (denominator) or 20.394 if it is in numerator ( 1 mol K2CR2O7/ 294.185 g)
to calculate the M of K2CR2O7 just divide it with the total volume of solution prepared
@@msc.6537 Thank you for the detailed explanation
¿0,1N = 0,1M? I NEED HELP.
Molarity and Normality is same for sodium thiosulfate.
No
There is difference between normality and molarity!
Take24.8 ginstead of 2.48g for 0.1N
For 1ltr
What 20.394
Its a calculation factor given by AOAC
i love u
Thank you
49.03 is factor not 20.394
What is your Reference?
K2Cr2O7 equivalent weight is 49.03
15% KI 100ml na 10%KI ___ml
Plzz calculate by yourself
??
Please specify your question
Thßnkß
You are welcome
Time stamp:
Step-01: 0:27
Step-02: 02:24
Step-03: 04:19
Step-04: 07:23
Step-05: 10:14
Thanks
Nice video
What is 20.39??
Calculation factor