An ICE table for PCl₅
"An ICE table for PCl₅" is a free, interactive Class 11 Chemistry simulation for NEET and JEE, built on the NCERT section "Applications of K and the reaction quotient" in Equilibrium. PCl5 ⇌ PCl3 + Cl2 in a flask: initial moles and volume set an ICE table that solves for x, α and Kc live, with molecule counts drawn. NEET has asked about this idea 3 times in 10 years of papers. JEE Main asked 52 questions from this chapter across the 42 shifts Lumi has analysed (2017–2026).
From the lesson Applications of K and the reaction quotient in Equilibrium. Change the values and watch what happens.
What it shows
NCERT § "Applications of Equilibrium Constants"
PCl5 ⇌ PCl3 + Cl2 in a flask: initial moles and volume set an ICE table that solves for x, α and Kc live, with molecule counts drawn.
Controls
4 to try
- Sliderinitial PCl5 0.1–2 mol
- Slidervolume 1–10 L
- SliderKc 0.01–10
- Segmentedstart from reactants / products
Try this
Find the volume at which half the PCl5 is dissociated (α = 0.5) for 1 mol with Kc = 0.5; goal checks |α − 0.5| < 0.02.
Common mistake
Putting moles straight into Kc when Δn ≠ 0.
In NEET
10 years of papers
Asked 3 times in 10 years of NEET.
See the past questions: Chemical Equilibrium, Equilibrium (chapter)
In JEE Main
42 shifts analysed
52 questions from Equilibrium across the 42 JEE Main shifts Lumi has analysed (2017–2026).
The idea behind it
NCERT § "Applications of Equilibrium Constants"
- The size of K shows how far a reaction goes: K > 10³ means products dominate, K < 10⁻³ means reactants dominate, and values in between mean appreciable amounts of both.
- The reaction quotient Q has the same form as K but uses concentrations at any instant, not just at equilibrium.
- If Q < K the reaction moves forward; if Q > K it moves backward; if Q = K it is at equilibrium.
- To calculate equilibrium amounts, set up an initial-change-equilibrium table using the stoichiometry, substitute into K and solve.
- Equilibrium concentrations depend on starting conditions, but the ratio defined by K does not.
Questions
5 answers
- What does the "An ICE table for PCl₅" simulation show?
- PCl5 ⇌ PCl3 + Cl2 in a flask: initial moles and volume set an ICE table that solves for x, α and Kc live, with molecule counts drawn.
- What mistake does the "An ICE table for PCl₅" simulation fix?
- A common mistake it clears up: putting moles straight into Kc when Δn ≠ 0.
- Has NEET asked about this idea?
- Yes. NEET has asked about this idea 3 times in 10 years of papers.
- Does JEE Main ask questions from Equilibrium?
- Yes. JEE Main asked 52 questions from this chapter across the 42 shifts Lumi has analysed (2017–2026).
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Applications of K and the reaction quotient" in Equilibrium (Class 11 Chemistry).
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