Conversion of Orthophosphoric acid to Pyro and Meta Phosphoric acid

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Discussion Overview

The discussion revolves around the conversion of orthophosphoric acid to pyro and meta phosphoric acid, focusing on the states of these acids at various temperatures. Participants are examining the implications of temperature on the physical state of the acids during and after the conversion process.

Discussion Character

  • Homework-related
  • Debate/contested

Main Points Raised

  • Some participants note that both pyro and meta phosphoric acids exist in solid form, yet the temperatures mentioned exceed their melting points, suggesting they would be in a liquid state during conversion.
  • Others express confusion over the final temperature of the product, questioning how it could be lower than the supplied temperature for conversion.
  • One participant suggests that the question does not specify the final state temperature, only the conversion temperature, which may lead to misunderstandings.
  • Another participant proposes that after heating, the acids would cool down to room temperature, implying that the final state should be solid.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the final state of the acids, with some arguing for a liquid state during conversion and others suggesting that the final state would be solid after cooling.

Contextual Notes

The discussion highlights the ambiguity in the question regarding the final temperature and state of the acids, which may affect interpretations of the conversion process.

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Homework Statement
Question pic is in My attempt.
Relevant Equations
Melting point of Pyrophosphoric acid
Melting point of Metaphosphoric acid
20200416_191355.png


I know that both Pyro and Meta phosphoric acid exists in solid form.But the temperature mentioned here are more than melting points of both.
So the acids will be obtained in liquid state.But the answer was given as b).
I can't make out the reason.Please explain.
 
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Physics lover said:
Homework Statement:: Question pic is in My attempt.
Relevant Equations:: Melting point of Pyrophosphoric acid
Melting point of Metaphosphoric acid

View attachment 260752

I know that both Pyro and Meta phosphoric acid exists in solid form.But the temperature mentioned here are more than melting points of both.
So the acids will be obtained in liquid state.But the answer was given as b).
I can't make out the reason.Please explain.
I think the answer given is wrong.Please confirm it.
 
The question doesn't say anything about the temperature of the final state, it just lists temperature at which conversion takes place.
 
Borek said:
The question doesn't say anything about the temperature of the final state, it just lists temperature at which conversion takes place.
I cannot understand that.How can final temperature be lower than supplied temperature.Please explain a little bit.
 
You heat up the acid to convert it, you leave it to cool down, you report state of the product at the room temperature.
 
Borek said:
You heat up the acid to convert it, you leave it to cool down, you report state of the product at the room temperature.
Ok so the answer would be both solid?
 

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