CI- Equilibrium

Question 1

What does the equilibrium constant give?

Answer 1

A mathematical expression for the relationship between the concentrations of the substances present once a reaction has reached equilibrium

Question 2

Where is the equilibrium position if Kc is large? Therefore lots of…
and yield is…

Answer 2

RHS
products
high

Question 3

When does Kc change?

Answer 3

If the temperature changes

Question 4

Kc gives no indication of..

Answer 4

Rate

Question 5

Method to determine Kc experimentally

Answer 5

Measure out starting quantities accurately

Leave to reach Eqb, with a catalyst if appt

Control and measure temperature (water bath) as it affect Kc and Eqb position

After suitable time period (eg 1 week) pipette out a sample

Determine amount of 1 substance present (eg titrate, measure pH, use calorimetry)

Use this value to find moles and then conc of all other species present

Calculate Kc

Question 6

When can Kc value be calculated- what do you need to know? (Which values must be obtained in experiment)

Answer 6

Original amounts of each substance in the eqb mixture
eqb concentration of one of the components