Biology-Online • View topic - Equilibrium

Equilibrium

Discussion of all aspects of cellular structure, physiology and communication.

Moderator: BioTeam

Equilibrium

In a series of reactions, A → B → C → D, it was determined that the equilibrium constant for the second reaction (B → C) is 0.1. You would expect the concentration of C in a living cell to be: (1) equal to B; (2) one tenth of B; (3) less than one tenth; (4)ten times that of B; (5) more than ten times of B. (Circle any correct answer).

In my opinion, the answer would be 3 because there are still more stages that need to bring the reaction to equilibrium. Is that right???
hannahzarzar
Garter

Posts: 30
Joined: Sun Jan 16, 2011 3:37 pm

if is there equilibrium and no other reactions, it should be 2
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

JackBean
Inland Taipan

Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Re: Equilibrium

But this is a living cell, and so it is not at equilibrium [ Jack, you tricky guy -- making a student THINK ]

jonmoulton
Viper

Posts: 442
Joined: Fri Feb 15, 2008 5:38 pm
Location: Philomath, Oregon, USA

well, even in the tube the equilibrium doesn't mean there's no reaction
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

JackBean
Inland Taipan

Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Re: Equilibrium

The question mentions that there are a series of reactions - A thru D. It mentions that B is 0.1. Doesn't the equation have to total 1 in order to have equilibrium?
hannahzarzar
Garter

Posts: 30
Joined: Sun Jan 16, 2011 3:37 pm

no, only for the particular reactions
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

JackBean
Inland Taipan

Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Re: Equilibrium

So, how am I to know how to calculate the answer? I'm totally lost on this question.
hannahzarzar
Garter

Posts: 30
Joined: Sun Jan 16, 2011 3:37 pm

the equilibrium constant is calculated as follows: K = [product]/[substrate], thus, if K = 0.1 = [product]/[substrate] -> [substrate] = 10[product]
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

JackBean
Inland Taipan

Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm