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Version
3.9
Size
809 Kb
Updated
1 month ago
Released
04 Apr 2015
Screenshots
Description
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
Estimates
Availability
Devices
iPad2Wifi
iPad23G
iPhone4S
iPadThirdGen
iPadThirdGen4G
iPhone5
iPodTouchFifthGen
iPadFourthGen
iPadFourthGen4G
iPadMini
iPadMini4G
iPhone5c
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
iPad75
iPad76
iPhoneXS
iPhoneXSMax
iPhoneXR
iPad812
iPad834
iPad856
iPad878
iPadMini5
iPadMini5Cellular
iPadAir3
iPadAir3Cellular
iPodTouchSeventhGen
iPhone11
iPhone11Pro
iPadSeventhGen
iPadSeventhGenCellular
iPhone11ProMax
iPhoneSESecondGen
iPadProSecondGen
iPadProSecondGenCellular
iPadProFourthGen
iPadProFourthGenCellular
iPhone12Mini
iPhone12
iPhone12Pro
iPhone12ProMax
iPadAir4
iPadAir4Cellular
iPadEighthGen
iPadEighthGenCellular
iPadProThirdGen
iPadProThirdGenCellular
iPadProFifthGen
iPadProFifthGenCellular
iPhone13Pro
iPhone13ProMax
iPhone13Mini
iPhone13
iPadMiniSixthGen
iPadMiniSixthGenCellular
iPadNinthGen
iPadNinthGenCellular
iPhoneSEThirdGen
iPadAirFifthGen
iPadAirFifthGenCellular
iPhone14
iPhone14Plus
iPhone14Pro
iPhone14ProMax
iPadTenthGen
iPadTenthGenCellular
iPadPro11FourthGen
iPadPro11FourthGenCellular
iPadProSixthGen
iPadProSixthGenCellular
Pricing by country
| Country | Price |
|---|---|
| Canada | 4.99 CAD |
| China | 12 CNY |
| France | 3.99 EUR |
| Germany | 3.99 EUR |
| Italy | 3.99 EUR |
| Netherlands | 3.99 EUR |
| Portugal | 3.99 EUR |
| Spain | 3.99 EUR |
| UK | 3.99 GBP |
| Japan | 600 JPY |
| Korea, Republic Of | 6600 KRW |
| Turkey | 8.99 TRY |
| USA | 3.99 USD |
| Korea, Republic Of | 2.19 USD |
