# How do you find K for the reverse reaction?

## How do you find K for the reverse reaction?

The equilibrium expression written for a reaction written in the reverse direction is the reciprocal of the one for the forward reaction. K’ is the constant for the reverse reaction and K is that of the forward reaction….

Equation | Equilibrium Constant |
---|---|

� N2(g) + O2(g) NO2(g) | Kc = 4.1 x 10-9 |

**When K is less than 1 is the reverse reaction favored?**

If the value of K is less than 1, the reactants in the reaction are favored. If K is equal to 1, neither reactants nor products are favored.

### What is the equilibrium constant for the reaction Fe2+ Ce4+?

Calculate the equilibrium constant for the reaction : Fe2+ + Ce4+ → Fe3+ + Ce3+, [Given E e sti = 1.61 V; EX23. Fe2+ = 0.77V)

**What happens to K When you double the reaction?**

For a reversible reaction, even if the concentration of the reactants is doubled, the value of the equilibrium constant for the reaction will remain the same.

## What is the relation between E cell and equilibrium constant?

The Relationship between Cell Potential & the Equilibrium Constant. Thus E°cell is directly proportional to the logarithm of the equilibrium constant. This means that large equilibrium constants correspond to large positive values of E°cell and vice versa.

**What is the equilibrium constant for the cell reaction?**

Now there is enough information known to use the Nernst equation to find the equilibrium constant. Answer: The equilibrium constant of the cell’s redox reaction is 3.16 x 10282.

### What is the direction of the reaction if K is less than 1?

If K = 1, the equilibrium mixture contains almost equal amounts of reactants and products. If K << 1 the reverse reaction is favored.

**Is a reaction spontaneous when K is greater than 1?**

In order for lnK to be negative, K < 1. delta Go is the standard-state free energy. When this is negative, the reaction is spontaneous, therefore k is greater than one because more product is produced.

## How do you write an expression for K?

A number raised to the power of 1 is just itself, so these two expressions are equivalent. We almost always just write it in the first form, ignoring coefficients of 1….Writing the K Expression.

Equilibrium Equation | Kc |
---|---|

CaCO3 (s) CO2 (g) + CaO (s) | K = [CO2] |

CH3COOH (aq) + H2O (l) H3O+ (aq) + CH3COO- (aq) |

**What does the equilibrium constant expression depends on?**

The value of the equilibrium constant for any reaction is only determined by experiment. It does, however, depend on the temperature of the reaction. This is because equilibrium is defined as a condition resulting from the rates of forward and reverse reactions being equal.

### What happens to K when you reverse a reaction?

When you reverse a reaction, the new value of K becomes 1/K or K -1. Also, when you multiply an equation by some factor (such as 1/2), then you raise K to that factor:

**How to calculate k’s for other chemical reactions?**

K’ = K 1 x K 2 . . . K 1 , K 2, etc. represent the equilibrium constants for reactions being added together, and K’ represents the equilibrium constant for the desired reaction. Example: Calculate the value of K c for the reaction: 2 NO(g) + Br 2 (g) 2 NOBr (g) using the following information.

## What happens when we multiply K by K’?

Now let’s see what happens when we multiply K by K’ : In general we can say that for a chemical reaction with equilibrium constant K at a constant temperature T, reversing the chemical reaction at the same temperature T results in an equilibrium constant that is the recripocal of K. Do you know this?

**How to write equilibrium constant, k, and reverse reactions?**

Then we write the expression for the equilibrium constant (K) based on defining the products of the forward reaction as being on the right hand side of the chemical equation: Note that the reaction does not go to completion, rather, while reactants are reacting to produce the product, the product is also decomposing to reform the reactants!