"Standard conditions" vs. STP

[brandonh4]

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In one of TBR's worksheet, they identify "standard conditions" as 25C and 1 atm. I had always taken "standard conditions" to mean STP, which is 0C and 1 atm.

Can someone help set the record straight?

 

[syoung]

standard temp and pressure: well 0C is not very standard is it? They chose 25C and 1atm to represent what most labs have

 

[milski]

Depending on the context, 15-25 C, 1 atm. 0 is way too cold for standard conditions.


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[aspiringdoc09]

In one of TBR's worksheet, they identify "standard conditions" as 25C and 1 atm. I had always taken "standard conditions" to mean STP, which is 0C and 1 atm.

Can someone help set the record straight?

Standard conditions (1 atm & 25C) is dealing more with thermodynamic variables: enthalpy, entropy, and gibbs free energy. These are the conditions that these variables are initially measured at.

STP is 1 atm & 0C but again these values are based on non-thermodynamic variables.

 

[Buttafuoco]

Depending on the context, 15-25 C, 1 atm. 0 is way too cold for standard conditions.


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Yeah I tend to remember that standard indicates 25 degrees C most of the time just by thinking "What is the approximate temperature of pretty much every laboratory?"

STP is just an oddball thing.

 

[Meredith92]

Depending on the context, 15-25 C, 1 atm. 0 is way too cold for standard conditions.


So unless they literally say "STP" standard conditions usually means 25 C???

 

[milski]

Pretty much. A lot of data tables give you standard values at 25 C so that you don't have to make adjustments in a lab, which does lead to a certain level of ambiguity. I have no idea how well that's resolved in MCAT questions.