What is KF and KR?

Asked By: Killian Traver | Last Updated: 25th January, 2020
Category: science chemistry
4.4/5 (2,239 Views . 11 Votes)
Equilibrium constant (K) for any reaction is the ratio of Rate constant for Forward reaction (Kf) to the Rate constant for Backward reaction (Kr). K = Kf / Kr. Kf and Kr remain unequal, but the respective rate will be equal due to the change in concentration.

Click to see full answer


Similarly one may ask, which rate constant is larger KF or Kr?

The reaction C → D has the larger kf, the smaller kr, and the larger Kc (because it has the lowest activation energy for the forward direction). Remember that a large k (rate constant) means that the reaction is fast and therefore the reaction has a low activation energy.

Also, what does a large KF value mean? If K is a large number, it means that the equilibrium concentration of the products is large. In this case, the reaction as written will proceed to the right (resulting in an increase in the concentration of products) If K is a small number, it means that the equilibrium concentration of the reactants is large.

Just so, what is KF in chemistry equilibrium?

Chemical reactions, whether reversible or non-reversible, follow the chemical kinetics. Thus we can gain better understanding of the equilibrium constant K by using the concept of chemical kinetics. Let kf be the rate of forward reaction and kr be the rate of reverse reaction as shown below.

What is KF in solubility?

Many metal sulfides are insoluble in water, but dissolve in acidic solutions. Complex Ion Formation, or stability constant, Kf, of a complex ion is the equilibrium constant for the formation of the complex ion from the aqueous metal ion and the ligands.

32 Related Question Answers Found

Does this mean that at equilibrium there are 1.5 106 times as many product molecules as reactant molecules?

The magnitude of the equilibrium constant, K, depends on the relative rate constants, not the speed of the reactions. The statement is vaguely correct. If Ke = 1.5 106, the arithmetic product of the concentrations of all product molecules is 1.5 * 106 times the product of the concentrations of all reactant molecules.

Is KF an acid or base?

KF is a salt that comes from a strong base, KOH, and a weak acid, HF. When added to water, the salt dissociates into a K+ ion and F- ion. The F- ion, which is the conjugate base of the weak acid, reacts with water by accepting one hydrogen atom from water and forming hydroxide.

What is the formula for KF?

To calculate the freezing point depression constant, or Kf, you'll need the equation: delta Tf = Kfcm where cm is the molal concentration of the solution. Write down what you know. Since Kf is a constant, or a number that is always the same, it is often provided in a chart or table in chemistry books.

What is the KF value?

Kf is the molal freezing point depression constant of the solvent (1.86 °C/m for water). m = molality = moles of solute per kilogram of solvent.

Is KF soluble in water?


KF is highly soluble in water. It initially dissociates into K+ and F-. However, the F- further hydrolyzes with water to form HF. Since HF is a weak acid (pKa = 3.17), it would rather exist as molecular HF than ionic F-.

What is K in chemistry?

K has a great significant in Chemistry. In inorganic chem, K (capital) is use to denote the element Potassium, that means K is the symbol of Potassium. In physical chem, k is used to depict equilibrium constant or solubility constant. ( Keq = equilibrium constant; Ksp = solubility constant)

What is the mathematical relationship between KF and KD?

the correct relation between kf and kd is kf=kd, kf=1/kd,kf=1 /kd square, kf=square root of kd, any - Brainly.in.

What is I in freezing point depression?

Freezing-point depression is the decrease of the freezing point of a solvent on the addition of a non-volatile solute. Examples include salt in water, alcohol in water, or the mixing of two solids such as impurities into a finely powdered drug.

What is stepwise formation constant?

A stability constant (formation constant, binding constant) is an equilibrium constant for the formation of a complex in solution. It is a measure of the strength of the interaction between the reagents that come together to form the complex.

Does Q change with temperature?


As long as the pressures are fixed, the temperature does not affect the instantaneous value of the reaction quotient. When you increase the temperature, what happens is that the equilibrium constant K drops. Let's say that before changing the temperature Q=K=0.01 (just an example).

What does KEQ 1 mean?

If Keq = 1, then the position of equilibrium is in the center, the amount of products is roughly equal to the amount of reactants at equilibrium. If Keq is much smaller than 1 (For example if Keq = 10-3), then the position of equilibrium is to the left; more reactants are present at equilibrium.

What affects KEQ?

A system in equilibrium is affected by the following factors:
  • Change of concentration of any reactant or product.
  • Change of temperature of the system.
  • Change of pressure of the system.
  • Addition of catalyst.
  • Addition of some inert gas.

What does it mean if k is greater than 1?

If K is larger than 1, the mixture contains mostly products. K < 1. If K is less than 1, the mixture contains mostly reactants. K = 1. If K is about equal to 1, the reaction will reach equilibrium as an intermediate mixture, meaning the amounts of products and reactants will be about the same.

Does a large equilibrium constant mean that products or reactants are favored?

The value of K indicates the equilibrium ratio of products to reactants. In an equilibrium mixture both reactants and products co-exist. Large K > 1 products are "favored"

Does a large equilibrium constant mean that the reaction must be rapid?


The equilibrium position of a reaction is determined by the difference in energy between reactants and products. Thus, a reaction with a large Keq does not necessarily have a rapid rate.

Why does K change with temperature?

Because the K value decreases with an increase in temperature, the reaction is an exothermic reaction. 4. However, an increase in temperature allows the system to absorb energy and thus favor an endothermic reaction; the equilibrium will shift to the left.

Can the equilibrium constant ever be zero?

The equilibrium constant cannot be 0. This is because this implies that the concentration of products is equal to 0 at equilibrium.