# What is the equivalent weight of OH group?

## What is the equivalent weight of OH group?

1180 is the equivalent weight in grams per mole of hydroxyl group.

### How do you calculate molecular weight from hydroxyl?

*The molecular weight of KOH is 56.1. Since hydroxyl number (OH) is expressed in milliweights per unit weight, we must multiply 56.1 by 1000 to convert to OH, and the factor 56,100 appears in the calculations. OH is a dimensionless unit; it can be expressed in any weight system without altering its numerical value.

#### How is NCO calculated?

Calculation of Free NCO: % Free NCO = (B-S) x N x 4.2/Wt. of the sample.

**How is equivalent weight calculated?**

Thus to find out the equivalent weight, the atomic weight of the substance is divided by its valence. As an example, the equivalent weight of the oxygen will be equal to 16.0 g / 2 = 8.0 g.

**What is a hydroxyl functional group?**

A hydroxy or hydroxyl group is a functional group with the chemical formula -OH and composed of one oxygen atom covalently bonded to one hydrogen atom. In organic chemistry, alcohols and carboxylic acids contain one or more hydroxy groups.

## What is the purpose of hydroxyl value?

The value is important because it helps determine the Stoichiometry of a system for example in polyurethanes. The value may also be used to calculate equivalent weight and if the functionality is known, the molecular weight also.

### What is NCO and OH in adhesive?

NeoBond PUR 2A (NCO) & 2B (OH) is an economic adhesive system for production of standard laminates for General to medium Performance application. Suitable for low temperature applications 35 – 45 OC. Excellent adhesion to different types of film. No residual odor.

#### How do you calculate hydroxyl value?

%) of hydroxyl groups in units of the mass of hydroxide functional groups in grams per 100 grams of substance. The conversion between hydroxyl value and other hydroxyl content measurements is obtained by multiplying the hydroxyl value by the factor 17/560.

**What is equivalent weight example?**

Equivalent weight is expressed as the ratio of atomic weight or molecular weight to the valence. Equivalent weight depends on type of the substance. For example, Equivalent weight of acid = molecular weight of acid/basicity of acid. The acid H2SO4 can donate 2 hydrogens.

**What is meant by equivalent weight and strength?**

Definition of equivalent weight : the mass of a substance especially in grams that combines with or is chemically equivalent to eight grams of oxygen or one gram of hydrogen : the atomic or molecular weight divided by the valence.

## Where is equivalent weight used?

For redox reactions, the equivalent weight of each reactant supplies or reacts with one mole of electrons (e−) in a redox reaction. Equivalent weight has the units of mass, unlike atomic weight, which is now used as a synonym for relative atomic mass and is dimensionless.

### How do you calculate the equivalent weight?

1) Gather information about the equivalent weight of the reacting substance. Consult chemical reference books to find out the valence and the molecular weight of the substance. 2) Figure the equivalent weight of the substance. The equivalent weight of the substance is equal to the molecular weight divided by the valence. 3) Calculate normality. Normality is the concentration of the substance of interest in a dissolving liquid. 4) Try an example. Dissolve sodium chloride (NaCl) in water. Sodium chloride has a valence of 1 and a molecular weight of 58.443.

#### How to calculate the equivalent weights?

To get a more personal assessment of calorie burn, Hirai recommends using a measurement called metabolic equivalent, or METs 0.0175 x MET x weight (in kg) To calculate your weight in kilograms, divide your weight in pounds by 2.2. So, a person

**What is the formula of equivalent weight?**

What is equivalent weight formula? Equivalent weight (EW) is the molar mass of a substance divided by the n number of equivalents in thesubstance. For acids or bases, the n number of equivalents is thenumber of hydroxide ions in the base (OH-1) , and the number ofhydrogen ions in the acid (H+1).

**How to calculate equivalent weight?**

Equivalent Weight of Acid and base. In the above formula X represents the valency factor.