## What is the KEQ value for FeSCN2+?

The Fe3+ in the **iron**(III) nitrate reacts with the HSCN to produce some red FeSCN2+ complex ion. By spectroscopy and Beer’s Law, it is found that [FeSCN2+] at equilibrium is 1.50 x 10-4 M.

## What is the value of the equilibrium constant?

The **equilibrium constant value** is the ratio of the concentrations of the products over the reactants. This means that we can use the **value** of K to predict whether there are more products or reactants at **equilibrium** for a given reaction.

## What is concentration equilibrium constant?

the **equilibrium constant**, also known as K _{eq}, is defined by the following expression: where [A] is the molar **concentration** of species A at **equilibrium**, and so forth. The coefficients a, b, c, and d in the chemical equation become exponents in the expression for K _{eq}.

## How do you find equilibrium constant from absorbance?

X = [Fe(SCN)2+] and is to be determined from the standard curve. You can then **calculate** the **equilibrium constant**, Keq, using the **equilibrium** concentrations. The standard curve is a plot of **Absorbance** versus [Fe(SCN)2+] (Figure 8.1). It can be used to give us the concentration of a solution when given the **absorbance**.

## How do you calculate FeSCN2+ EQ?

4. [**FeSCN ^{2}^{+}**]

**is**

_{eq}**calculated**using the

**formula**: where A

**and A**

_{eq}_{std}are the absorbance values for the equilibrium and standard test tubes, respectively, and [

**FeSCN**]std = (1/10)(0.0020) = 0.00020 M.

^{2}^{+}## Why equilibrium constant has no unit?

Since activities are unitless, they eliminate the **units** of all the quantities in the **equilibrium constant** expression, making the **constant** itself unitless all the time. Thus, they are always in their reference state, and thus always **have** an activity of 1.

## What is K in equilibrium?

Consider a simple chemical system including just two compounds, A and B: Q is a quantity that changes as a reaction system approaches **equilibrium**. **K** is the numerical value of Q at the “end” of the reaction, when **equilibrium** is reached.

## Why is equilibrium constant not affected by pressure?

**Equilibrium constants** aren’t changed if you change the **pressure** of the system. The only thing that changes an **equilibrium constant** is a change of temperature. If there are the same number of molecules on each side of the equation, then a change of **pressure** makes **no** difference to the position of **equilibrium**.

## What is the purpose of the determination of an equilibrium constant lab?

The **equilibrium constant**, K, is used to quantify the **equilibrium** state. The expression for the **equilibrium constant** for a reaction is determined by examining the balanced chemical equation.

## What is K in Beer’s law?

**Beer’s law** is A = kc; b is constant; **k** is a× b, or in the form for molar absorptivity, **k** is ε× b; a is absorptivity. Lambert’s **law** is A = **k**′b; c is constant; **k**′ is a ×c, or ε× c.