Standard State

[Tracy Tran 3L]

I am a bit confused on what standard state is. Does that mean a compound has to be completely broken down to its elemental state? Like for example C + O2 = CO2? Or is it the state that each compound/element is in (like gas, liquid, solid)?

[Katelyn Alvarado 3K]

I believe the standard state is just a reference point for calculating enthalpy entropy, and Gibbs free energy of a substance. For example, for gases, it is the substance at a standard pressure of 1 bar. For solutions, it is the substance at a concentration of 1 M and 1 bar.

[Jamie Lin 1K]

Standard state is where the specific quantity being analyzed is measured under the same conditions. For instance, the standard reaction enthalpy is found through the standard state of the reactants and products being equal to 1 atm. The 1 atm is the same condition that all reactants and products are assumed to being measured in.

[405669838]

Yes, what the previous replies say. Standard state has to do with what conditions we are measuring the molecules in.

[Triston Dinh 1D]

The standard state simply refers to the state of the molecule at standard conditions. For example, the standard state of carbon (at 1 atm and 25 degrees Celsius) would be graphite in its solid form and we would use its standard enthalpy of formation for this form.

[Aanjaneyaa]

The standard state is just what to base calculations off of. Things like 1 bar, 1 atm, 25 degrees Celsius, and 298 Kelvin are all versions of that.

[Kayla Tran 3C]

Standard state is a defined reference point. For example, gases are at 1 atm, substances are in 1M solutions, pure solids and liquids are most stable at 1atm and 25C, etc.

[Zoe Dhalla 3I]

At any particular temperature, we define the standard state of any liquid or solid substance to be the most stable form of that substance at a pressure of one bar. For example, for water at −10 C, the standard state is ice at a pressure of one bar; at +10 C, it is liquid water at a pressure of one bar. The standard states of elements are the forms that they adopt at a temperature of 25°C and pressure of 1 atmosphere (1 atm).

[RobinFong_2B]

The standard state is the measurements of an element or chemical reaction taken at 25 degrees celsius. This makes it easier for people in the science community to communicate about certain processes. Think standardized units.

[Dillon Taing 3H]

The standard state is the conventional reference used to define the state of a system. It is the conditions in which a substance is most stable at, such as when gases are under a pressure of 1 atm and typically 25 degrees Celsius.

[Neeti Indiresan 3I]

Standard state is just the state of a substance under standard conditions (1 atm, 25 C).