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 do you find equivalent weight in chemistry?
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.
How do you find the hydroxyl value of resin?
The hydroxyl value of unsaturated polyester resin is measured first by adding toluene and 4-dimethylaminopyridine to the sample. Stir them for 30 minutes and add di-ｎ-butylamine, and then titrate with hydrochloric acid・ethanol up to the endpoint. The endpoint is the maximum inflexion on titration curve.
What is hydroxyl value chemistry?
Hydroxyl value is a measure of the content of free hydroxyl groups in a chemical substance, usually expressed in units of the mass of potassium hydroxide (KOH) in milligrams equivalent to the hydroxyl content of one gram of the chemical substance.
What is a hydroxyl functional group?
The hydroxyl group is a functional group consisting of a hydrogen atom covalently bonded to an oxygen atom. The hydroxyl group is denoted by -OH in chemical structures and has a valence charge of -1. The hydroxyl radical is very reactive, so it quickly reacts with other chemical species.
How do you calculate hydroxyl value?
The analytical method used to determine hydroxyl value traditionally involves acetylation of the free hydroxyl groups of the substance with acetic anhydride in pyridine solvent.
How do you estimate the number of hydroxyl groups?
The number of hydroxyl groups in many organic compounds can be easily determined by treatment with acetic anhydride and pyridine followed by titration. The method apparently works well with a variety of sugars and sugar derivatives. Results are given of determinations carried out on hydroxylated compounds.
How do you find the equivalent weight of hydrogen peroxide?
- Valence factor of H2O2=2.
- Molar mass of H2O2=(1×2+16×2)=34.
- Equivalent Weight=34/2=17.
What is the formula for hydroxyl?
-OH
A hydroxyl group is composed of one hydrogen atom bonded to one oxygen atom. Its chemical formula is written as either -OH or HO-.
How do you find a hydroxyl group?
A hydroxyl group is composed of one atom of hydrogen and one of oxygen. One way to write the chemical formula for a hydroxyl group is -OH. Hydroxyl groups usually attach themselves to organic compounds converting them into important substances.
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.