Morning folks,
On reading and older email 1 June 06 from Robb. He said screened Methyl Orange indicator will give a more accurate detemination for the standardisation technique. Can some one please tell me what is the difference between Methyl Orange & Screened Methyl Orange. Is it filtered??
Regards
Screened Methyl Orange
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Labbie
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Screened Methyl Orange
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Screened Methyl Orange
The recipe I use is as follows:
Methyl orange - 1.0g
Indigo carmine - 2.5g
Dissolve powders in 1L distilled water. Filter before use.
pH range 2.9 (purple) - 4.6 (dark green).
The colour change is easier to see than Methyl orange but the shelf life isn't that long.
Generally worth the effort of having to make it up more frequently.
Methyl orange - 1.0g
Indigo carmine - 2.5g
Dissolve powders in 1L distilled water. Filter before use.
pH range 2.9 (purple) - 4.6 (dark green).
The colour change is easier to see than Methyl orange but the shelf life isn't that long.
Generally worth the effort of having to make it up more frequently.
Screened Indicators (Scr. Methyl Orange)
Hi Pommy,
Just to let you know that a screened Indicator is a particular indicator with the addition of a pH sensitive dyestuff.
This will improve the colour change of an indicator. With that addition the colour change is more sudden and prominent, making the indicator more accurate for pH determination.
The make up of screened Methyl Orange is done by using the dyestuff Xylene Cyanol FF, and to make this up the recipe is as follows:
Simply Dissolve,
1.0g of Methyl Orange;
1.4g of Xylene Cyanol FF;
In 500mL of 50% Ethanol (50% Ethanol 50% Water).
This will certainly get you out of trouble and explain a lot.
Cheers,
Robb.....
Just to let you know that a screened Indicator is a particular indicator with the addition of a pH sensitive dyestuff.
This will improve the colour change of an indicator. With that addition the colour change is more sudden and prominent, making the indicator more accurate for pH determination.
The make up of screened Methyl Orange is done by using the dyestuff Xylene Cyanol FF, and to make this up the recipe is as follows:
Simply Dissolve,
1.0g of Methyl Orange;
1.4g of Xylene Cyanol FF;
In 500mL of 50% Ethanol (50% Ethanol 50% Water).
This will certainly get you out of trouble and explain a lot.
Cheers,
Robb.....
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Scr. Methyl Orange
Hi pommy,
Not a problem,
Glad to be of help.
Cheers,
Robb.....
Not a problem,
Glad to be of help.
Cheers,
Robb.....
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Screened Methyl Orange
Hi Pommy,
I will send you a private message with the supplier, keeping in mind that for 10g we are looking at around $68.00.
In normal titrimetric circumstances methyl Orange or even Universal Indicator is fine for use.
But if you are specific in carrying out Standardisation techniques or if you want to know the exact molarity of a solution then this will no doubt have to be the option.
Once you make this solution, it buffers itself through the Xylenes present. This means the reagent will be stable upon storage for years to come.
Cheers,
Robb.
I will send you a private message with the supplier, keeping in mind that for 10g we are looking at around $68.00.
In normal titrimetric circumstances methyl Orange or even Universal Indicator is fine for use.
But if you are specific in carrying out Standardisation techniques or if you want to know the exact molarity of a solution then this will no doubt have to be the option.
Once you make this solution, it buffers itself through the Xylenes present. This means the reagent will be stable upon storage for years to come.
Cheers,
Robb.
Last edited by Robb on 16 Feb 2007, 19:14, edited 1 time in total.
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
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Ocean Breeze
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