Sodium thiosulfate

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Zali
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Sodium thiosulfate

Post by Zali »

Hello

I am very new to being a "Labbie".

Could anyone please tell me the amount/weight of sodium thiosulfate required to make 0.250M.

ps. I really need to take maths class again.

Cheers
Zali
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macca
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Re: Sodium thiosulfate

Post by macca »

62.04gm in 1 lt hope that helps
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Wato3
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Re: Sodium thiosulfate

Post by Wato3 »

To make a molar soln write this formula down for future use

g=M x V x MW (grams = Molar x Volume x Molecular weight)

So for your example- you want a 0.25M soln made to 1 litre of sodium thiosulphate that has a MW of 248.18

so therefore

g= 0.25 x 1 x 248.18
g= 62.04g

so you will need 62.04g of sodium thiosulphate to 1 litre of water

I hope this helps
Last edited by Wato3 on 26 Aug 2015, 13:50, edited 1 time in total.
Zali
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Re: Sodium thiosulfate

Post by Zali »

Thanks it did and went well
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superbug
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Re: Sodium thiosulfate

Post by superbug »

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ELIZABETH
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Re: Sodium thiosulfate

Post by ELIZABETH »

I have the app on my phone and it's very handy!!
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smiley
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Re: Sodium thiosulfate

Post by smiley »

What app?
Cheers, K 8-)
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macca
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Re: Sodium thiosulfate

Post by macca »

Click on the above link then to your right is the app store. :coffee:
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smiley
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Re: Sodium thiosulfate

Post by smiley »

Cool! Never paid attention to that before. I'm getting it! :thumbup:
Cheers, K 8-)
Trex57
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Re: Sodium thiosulfate

Post by Trex57 »

Thank you smiley it will help out and I did not notice it when I opened the link.
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Jody1
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Re: Sodium thiosulfate

Post by Jody1 »

As a newbie too, everyday I log on to here and get some many useful and helpful tips! Thanks everyone for sharing your expertise!!
Jody :D
michellen
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Re: Sodium thiosulfate

Post by michellen »

Hi everyone, do you ever add sodium hydroxide when making up sodium thiosulfate? I made up a 0.2 M solution the straightforward way, 31.6 g in 1 L H2O, and my colleague who has been doing the job for more than 15 years said the proper way was to add 0.8 g of NaOH but she couldn't say why.

I did a google search and came across the use of sodium thiosulfate with NaOH in a titration prac which mentioned that solutions less than 0.1 M are unstable. I was wondering if this is a standard practice across all concentrations?
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Labbie
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Re: Sodium thiosulfate

Post by Labbie »

As with Copper Sulfate, you add an acid, it help keeps it longer, and much more stable. These are the tricks you learn along the way, so to speak of.
Regards Labbie

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Now retired :wub:
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