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Sodium Pyrophosphate: Disodium Phosphate Heated to 300 °C
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Charlie

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Sodium Pyrophosphate: Disodium Phosphate Heated to 300 °C

Sodium pyrophosphate is a white salt that dissolves to an alkaline solution. Thorpe's Dictionary (1913) makes it in two easy stages: neutralise phosphoric acid with soda until alkaline and crystallise disodium phosphate, then heat the dried salt to 300 °C, when it gives off water and turns into the pyrophosphate. The picture: our diagram.
Oqalayo
1 day

Imiyalelo

1

Phosphoric acid and soda

Add sodium carbonate to phosphoric acid diluted with water until the solution is alkaline. Filter.

Izinto zokwakha zalesi sinyathelo:

I-asidi ye-phosphoric (85 %)I-asidi ye-phosphoric (85 %)1 ucezu
I-Sodium Carbonate (umlotha we-soda)I-Sodium Carbonate (umlotha we-soda)1 ucezu

Amathuluzi adingekayo:

Amanzi AcwengisisiweAmanzi Acwengisisiwe
Iphepha elikhombisa i-pHIphepha elikhombisa i-pH
Ibhikha Lengilazi Elimelana NokushisaIbhikha Lengilazi Elimelana Nokushisa
Ifanela Lengilazi ElinomlomoIfanela Lengilazi Elinomlomo
Iphepha LokuhluzaIphepha Lokuhluza
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
2

Crystallise disodium phosphate

Concentrate and let it crystallise: large clear prisms of disodium phosphate. Dry them at about 45 °C until they lose their water.

Amathuluzi adingekayo:

Ipuleti LokuhwamukaIpuleti Lokuhwamuka
Ipuleti ElishisayoIpuleti Elishisayo
3

Heat to 300 °C

Heat the dry salt to 300 °C: it gives off water and turns completely into sodium pyrophosphate, a white glassy mass.

Amathuluzi adingekayo:

Imbiza YokuncibilikisaImbiza Yokuncibilikisa
Isithando se-muffleIsithando se-muffle
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa

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Amathuluzi Adingekayo

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I-sodium pyrophosphate

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Phosphoric Acid from Burned Phosphorus: the Thermal Process
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Phosphoric Acid from Burned Phosphorus: the Thermal Process

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