Chemical Equilibrium
$3.99
3.8for iPhone, iPad
Age Rating
Chemical Equilibrium Screenshots
About Chemical Equilibrium
Chemical Equilibrium is a tool for accurate estimation of concentrations and pressures of the chemical reaction reactants and products at equilibrium. The application derives final, equilibrium parameters based on equilibrium constants (Kc and Kp), initial concentrations and stoichiometric coefficients. Additionally, app calculates reaction quotient for any given concentrations and stoichiometry.
For a general chemical reaction:
aA + bB = cC + dD,
the Reaction Quotient (Q) is defined by:
Q= (C^c * D^d) / (A^a * B^b)
where A, B, C, D – are compounds’ concentrations or pressures and a, b, c, d are stoichiometric coefficient*. Sum of powers determines the reaction order.
*Importantly, real system powers may differ from reaction coefficients, due to overall reaction mechanism complexity.
If Q is not equal to reaction equilibrium constant K (Kc for concentrations and Kp for pressures), then reaction is not at equilibrium and it will proceed (due to difference in forward and reverse reaction speeds) to the direction defined by Q.
If Q is less than K reaction will move towards products (C and D), in opposite case – reverse reaction will prevail.
Example:
For given reaction: 2A + 1B = 3D + 2E , initial reaction concentrations are Ao=0.1M, Bo=0.2M, Do=0.3M and Eo=0.4M and Kc=1 M^2.
the Reaction Quotient (Q) is defined by:
Q= (D^3 * E^2) / (A^2 * B)
Loading the data to “Chemical Equilibrium” app, Reaction Quotient is immediately calculated, giving Q= 2.16 M^2. Apparently Q>K, suggesting that reaction is too close to the products side and reverse reaction will prevail to bring the reaction back to the equilibrium.
The new equilibrium concentrations of reaction components can be derived from the equation:
Apparently, solving this equation is rather demanding task, that turns to be unnecessary, since “Chemical Equilibrium” app immediately returns the answer: Aeq= 118.5 mM, Beq= 209.2 mM, Deq= 272.3 mM and Eeq= 381.5 mM.
The application features:
•To start calculation user is required to fill in stoichiometric coefficients, initial concentrations (pressures) of available components, and equilibrium constant Kc (Kp).
•Reaction coefficients are actually representing powers and therefore define reaction order.
•If certain compound do not contribute to equilibrium calculations, like water in aqueous solution, then to exclude the compound it is required to long press on its name field. To signal about the change, the background colour of the non contributing field is altering. To revert compound to the normal state it is required to long press again the appropriate field. See the screenshot.
•To start calculation initially or after updating the concentration or coefficient fields, user is requested to tap Run button!
•Significant attention should be paid to concentration, pressure and equilibrium constant units. App automatically changes the set of available units as per order of reaction!
•The power of equilibrium constant units depicted as “x” is defined as (c+d-a-b), where a, b, c and d are the stoichiometric coefficients of the reaction.
•The basic conversions are as follows:
1 M= (1e3) mM
1 atm=101325 Pa
For a general chemical reaction:
aA + bB = cC + dD,
the Reaction Quotient (Q) is defined by:
Q= (C^c * D^d) / (A^a * B^b)
where A, B, C, D – are compounds’ concentrations or pressures and a, b, c, d are stoichiometric coefficient*. Sum of powers determines the reaction order.
*Importantly, real system powers may differ from reaction coefficients, due to overall reaction mechanism complexity.
If Q is not equal to reaction equilibrium constant K (Kc for concentrations and Kp for pressures), then reaction is not at equilibrium and it will proceed (due to difference in forward and reverse reaction speeds) to the direction defined by Q.
If Q is less than K reaction will move towards products (C and D), in opposite case – reverse reaction will prevail.
Example:
For given reaction: 2A + 1B = 3D + 2E , initial reaction concentrations are Ao=0.1M, Bo=0.2M, Do=0.3M and Eo=0.4M and Kc=1 M^2.
the Reaction Quotient (Q) is defined by:
Q= (D^3 * E^2) / (A^2 * B)
Loading the data to “Chemical Equilibrium” app, Reaction Quotient is immediately calculated, giving Q= 2.16 M^2. Apparently Q>K, suggesting that reaction is too close to the products side and reverse reaction will prevail to bring the reaction back to the equilibrium.
The new equilibrium concentrations of reaction components can be derived from the equation:
Apparently, solving this equation is rather demanding task, that turns to be unnecessary, since “Chemical Equilibrium” app immediately returns the answer: Aeq= 118.5 mM, Beq= 209.2 mM, Deq= 272.3 mM and Eeq= 381.5 mM.
The application features:
•To start calculation user is required to fill in stoichiometric coefficients, initial concentrations (pressures) of available components, and equilibrium constant Kc (Kp).
•Reaction coefficients are actually representing powers and therefore define reaction order.
•If certain compound do not contribute to equilibrium calculations, like water in aqueous solution, then to exclude the compound it is required to long press on its name field. To signal about the change, the background colour of the non contributing field is altering. To revert compound to the normal state it is required to long press again the appropriate field. See the screenshot.
•To start calculation initially or after updating the concentration or coefficient fields, user is requested to tap Run button!
•Significant attention should be paid to concentration, pressure and equilibrium constant units. App automatically changes the set of available units as per order of reaction!
•The power of equilibrium constant units depicted as “x” is defined as (c+d-a-b), where a, b, c and d are the stoichiometric coefficients of the reaction.
•The basic conversions are as follows:
1 M= (1e3) mM
1 atm=101325 Pa
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What's New in the Latest Version 3.8
Last updated on Dec 4, 2023
Old Versions
Compatibility update.
Show More
Version History
3.8
Dec 4, 2023
Compatibility update.
3.7
Jan 20, 2022
Compatibility update.
3.6
Jun 15, 2021
Compatibility update.
3.5
Jan 22, 2021
Compatibility update.
3.4
Jul 24, 2020
Compatibility update.
3.3
May 31, 2020
Compatibility update.
3.2
Mar 30, 2020
Compatibilty update.
3.0
Feb 22, 2020
Update to user interface.
2.9
Oct 15, 2018
Compatibility update.
2.7
Jan 29, 2018
Update adds possibility to exclude from calculations compounds that do not contribute to the reaction equilibrium, like water in aqueous solution. To exclude the compound it is required to long press on the name field. See the screenshot.
2.4
Jan 26, 2018
Compatibility update.
2.3
Nov 27, 2017
Compatibility update.
2.2
Oct 22, 2017
Compatibility update.
2.0
Feb 9, 2017
Number of components has been increased.
1.9
Jul 11, 2016
Compatibility update.
1.8
May 9, 2016
Compatibility update.
1.7
Mar 8, 2016
Compatibility update.
1.3
Oct 12, 2015
Compatibility update.
1.1
Aug 18, 2015
Compatibility update.
1.0
Apr 4, 2015
Chemical Equilibrium FAQ
Chemical Equilibrium is available in regions other than the following restricted countries:
Hungary,Kyrgyzstan,Macao,Tonga,Tanzania,Bulgaria,Cyprus,Czech Republic,Dominican Republic,Ecuador,Moldova,Trinidad and Tobago,Ukraine,Afghanistan,Cape Verde,Lebanon,Morocco,Mozambique,Turkmenistan,Uganda,British Virgin Islands,Cameroon,Mauritius,Turkey,Vanuatu,China,Kenya,Cambodia,Montserrat,Namibia,Nicaragua,Pakistan,Congo, Democratic Republic,Libya,Mauritania,Niger,Montenegro,Taiwan,Bolivia,Congo,Panama,Palau,Uzbekistan,Vietnam,Azerbaijan,Ghana,Gambia,Sri Lanka,Myanmar,Papua New Guinea,Paraguay,El Salvador,Grenada,Nigeria,Nauru,India,Mongolia,Slovenia,Kosovo,Israel,Kazakhstan,St. Lucia,Latvia,Cayman Islands,Angola,Croatia,Iraq,Mali,Turks and Caicos,Argentina,Dominica,Jordan,Maldives,Poland,Tajikistan,Tunisia,Burkina Faso,Costa Rica,St. Vincent & The Grenadines,Zimbabwe,Anguilla,Botswana,Suriname,Hong Kong,Malawi,Swaziland,Colombia,Lao Peoples Democratic Republic,Macedonia,Seychelles,Fiji,Micronesia,Yemen,Bermuda,St. Kitts and Nevis,Liberia,Oman,Rwanda,Uruguay,Zambia,Bhutan,Guyana,Honduras,Antigua And Barbuda,Albania,Guinea-bissau,Slovakia,Bahamas,Sao Tome & Principe,Barbados,Belarus,Jamaica,Nepal,Romania,Chad,Armenia,Bosnia & Herzegovina,Madagascar,Russia,Sierra Leone,Bahrain,Brazil,Estonia,Lithuania,Serbia,Venezuela,Benin,Belize,Senegal,Cote Divoire,Gabon,Malta,Algeria,Egypt,Georgia,Guatemala,Solomon Islands
Chemical Equilibrium supports English
Click here to learn how to download Chemical Equilibrium in restricted country or region.
Check the following list to see the minimum requirements of Chemical Equilibrium.
iPhone
Requires iOS 16.0 or later.
iPad
Requires iPadOS 16.0 or later.