Key Difference – Kc vs Kp
Kc thiab Kp yog qhov sib npaug. Qhov sib npaug tsis tu ncua ntawm cov tshuaj tiv thaiv sib xyaw yog tus lej uas qhia qhov sib piv ntawm cov concentrations lossis siab ntawm cov khoom thiab cov reactants hauv cov tshuaj tiv thaiv sib xyaw. Qhov sib txawv tseem ceeb ntawm Kc thiab Kp yog tias Kc yog qhov sib npaug tas li muab los ntawm cov ntsiab lus ntawm qhov concentration whereas Kp yog qhov sib npaug tas li muab los ntawm cov ntsiab lus ntawm lub siab.
Qhov kev sib npaug tas li yog muab rau cov kev cuam tshuam rov qab. Kc yog qhov sib npaug tas li muab raws li qhov sib piv ntawm cov khoom lag luam thiab cov reactants whereas Kp yog qhov sib npaug tas li muab raws li qhov sib piv ntawm qhov siab ntawm cov khoom thiab cov reactants.
Kc yog dab tsi?
Kc yog qhov sib npaug tas li muab raws li qhov sib piv ntawm cov khoom lag luam thiab cov tshuaj reactants. Cov molar concentrations ntawm cov khoom yog siv rau kev qhia ntawm Kc.
aA + bB ↔ cC + dD
Qhov sib npaug tsis tu ncua rau cov tshuaj tiv thaiv saum toj no tuaj yeem sau ua:
Kc=[C]c[D]d / [A]a[B] b
[A], [B], [C] thiab [D] yog qhov ntau ntawm A, B reactants thiab C, D cov khoom. Cov exponents "a", "b", "c" thiab "d" yog stoichiometric coefficients ntawm txhua reactant thiab cov khoom nyob rau hauv cov tshuaj sib npaug. Nyob rau hauv kev qhia ntawm Kc, cov concentrations ntawm reactants thiab cov khoom raug tsa mus rau lub hwj chim sib npaug zos rau lawv stoichiometric coefficients.
Kp yog dab tsi?
Kp yog qhov sib npaug tas li muab raws li qhov sib piv ntawm qhov siab ntawm cov khoom thiab cov reactants. Qhov equilibrium tas li no muaj feem xyuam rau cov tshuaj tiv thaiv gaseous. Kp nyob ntawm ib feem ntawm cov khoom siv roj gaseous hauv cov tshuaj tiv thaiv sib tov.
Daim duab 1: Ib feem ntawm cov khoom siv roj hauv qhov sib tov.
pP + qQ ↔ rR + sS
Qhov sib npaug tsis tu ncua rau cov tshuaj tiv thaiv saum toj no tuaj yeem sau ua:
Kp=pRr. /pPp.
"p" qhia qhov siab ib nrab. Yog li ntawd, pP, pQ, pR thiab pSyog ib feem ntawm P, Q, R thiab S roj Cheebtsam. Cov exponents "p', "q", "r" thiab "s" yog stoichiometric coefficients ntawm txhua reactant thiab cov khoom nyob rau hauv cov tshuaj sib npaug.
Kev sib raug zoo ntawm Kc thiab Kp yog dab tsi?
Kp=Kc(RT)Δ
Qhov twg Kp yog qhov sib npaug ntawm qhov siab, Kc yog qhov sib npaug ntawm qhov concentration, R yog cov roj universal tas li (8.314 Jmol-1K-1), T yog qhov kub thiab Δn yog qhov sib txawv ntawm tag nrho cov moles ntawm cov khoom siv roj thiab tag nrho cov moles ntawm cov pa reactants.
Qhov txawv ntawm Kc thiab Kp yog dab tsi?
Kc vs Kp |
|
| Kc yog qhov sib npaug tas li muab raws li qhov sib piv ntawm cov khoom siv thiab cov reactants. | Kp yog qhov sib npaug tas li muab raws li qhov sib piv ntawm qhov siab ntawm cov khoom thiab cov tshuaj reactants. |
| Reactants | |
| Kc tuaj yeem siv rau cov roj av lossis kua tshuaj sib tov. | Kp tsuas yog siv rau cov tshuaj tiv thaiv gaseous xwb. |
| Units | |
| Kc yog muab los ntawm units ntawm concentration. | Kp yog muab los ntawm units ntawm siab. |
Summary – Kc vs Kp
Qhov sib npaug ntawm cov tshuaj tiv thaiv sib xyaw piav qhia qhov piv ntawm cov khoom thiab cov reactants tam sim no nyob rau hauv cov tshuaj tiv thaiv sib tov nyob rau hauv cov nqe lus ntawm ob qho tib si concentrations (muab raws li Kc) los yog ib nrab siab (muab raws li Kp). Qhov sib txawv tseem ceeb ntawm Kc thiab Kp yog tias Kc yog qhov sib npaug tas li uas tau muab los ntawm cov ntsiab lus ntawm qhov concentration whereas Kp yog qhov sib npaug tas li uas tau muab los ntawm cov ntsiab lus ntawm lub siab.
