Standard State

[Sasha Gladkikh 2A]

What is significance of standard state, and what are the conditions for each type of substance (e.g., gas, solution, pure liquid/solid)?

[Autumn Jackson Dis 1J]

Standard state is simply the state a substance is at at a certain pressure, usually 1 bar/1 atm.

[KyLee 1H]

It is significant because it serves as a reference point in thermodynamics, where we calculate the enthalpy etc based on this state.

[Amy Kalteis 2F]

The conditions for standard state are relatively: 25 degrees Celsius, all liquids and solids are pure, the concentration of all solutions is 1 M at 1 atm, all gases are at 1 atm, and elements are in their most stable phase.

[Anna Furton]

Standard state is the conditions mentioned above. Its purpose is so that we can form an understanding of the state of matter and energy etc of a substance at this defined state where it can be compared to other substances in that state, or that same substance in different states. Basically, standard state serves as a reference point in thermochemistry, kind of like sea level for geography, as Prof. Lavelle mentioned in lecture.

[Nandini_Parmar_1I]

Standard state is P (pressure) = 1 atm. This is useful in thermodynamics. T = 0 degrees Celsius.

[tristenleem3B]

Standard state is a substance at 1 bar; it's a way have a baseline measurement for the properties of an element or atom

[Natasha]

Standard state is important to know because it is the reference point that's used and is how we calculate enthalpy.

[Arshaun Faraji 2H]

Standard state is the state of a substance at a certain pressure (usually 1 bar). this is important because we use it to calculate enthalpy and other thermodynamics values.

[505749458]

Standard state lets us study a species or reaction without having to factor in differences in temperature, pressure, etc. Keeping all of these values constant (T=25C,P=1atm,etc.) lets us solve for other variables.

[Lesley Kim 1K]

Standard state is important because it simplifies testing conditions. It provides a reference point that you can easily compare data with. Standard state is usually at 1atm (or 1 barr) and 25ºc (or 289.15 K) with solutions at 1M concentrations.

[Divya Mehta 2K]

Standard state allows us to not have to factor differences in temperature and/or pressure, etc

[eve444]

Standard state allows us to compute what we need to without worrying about changes in pressure, temperature, or concentration. Standard state says everything is 1 atm, 25 degrees C, and 1 molar.

[Jeff Balian 2D]

What is the difference between the standard state and standard state of formation for enthalpy? I understand the formulas, but I am confused about the topic conceptually.