Equivalent weight

Equivalent weight in chemistry is the most common term used and one of the basic concepts of chemistry in the physical chemistry part. An equivalent weight which is also known as gram equivalent can be defined as is the mass of one equivalent, that is the mass of a given substance that will combine with or displace a fixed quantity of another substance. Thus, in other words, gram equivalent or the equivalent weight of a substance is the mass of the substance that can displace 1.008 grams of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine. 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. In the acid-base reaction, the equivalent mass of an acid or base is always equal to the amount of mass that supplies or reacts with the one mole of hydrogen ion (H + ). similarly, for the redox reaction, the equivalent weight of the substance is the mass that supplies or reacts with one gram mole of electrons (e - ) produced in the redox reaction. It has a dimension of the unit mass that is unlike that of the atomic mass that is dimensionless in nature. The equivalent weight can be determined by the experiment and it can be determined from the molar mass of the substance. In addition, the equivalent weight can be determined by dividing the molecular mass by the number of positive or negative electrical charges that result from the dissolutio...

Equivalent Weight Equivalent weight is defined as the mass of one equivalent of a given substance that will combine with or displace a fixed quantity of another substance. It's useful in chemistry because it can be used to make chemically different molecules with different mass equal. It measures mass (the amount of matter in something), not "weight" meaning the gravitational pull on mass. Thus, in chemistry, it's acceptable to interchange weight with mass. The equivalent weight of an element is its atomic weight (also known as atomic mass) divided by its valence (combining power or number of electrons in the outer shell available for chemical bond formation). It's the portion of the element's atomic weight associated with each valence electron. Similarly, the equivalent weight of a compound is its molecular weight (total atomic mass of a molecule) divided by the net positive valence. Molecular weight and mole have the same idea but different definitions. A mole is a The number equivalent of an element is the amount of the element that reacts with or supplies 1 mole electron in a reaction. In other words, if n is the valency of the element, one equivalent of the element equals 1/n mole of element. In chemistry, substances are measured using molar mass and molecular mass. molecular mass is the mass of one molecule (measured in atomic mass units). For example, for water, H2O: the molecular weight or molar mass is 18 g/mol and the molecular mass, the mass of one molecule of w...

equivalent weight, in The equivalent weight of an For 4) in acid solution, 158.038/5 g; potassium dichromate (K 2Cr 2O 7), 294.192/6 g; and sodium thiosulfate (Na 2S 2O 3·5H 2O), 248.1828/1 g. For all oxidizing and reducing agents (elements or compounds), the equivalent weight is the weight of the substance that is associated with the loss or gain of one mole (6.023 × 10 23) of electrons. The equivalent weight of an 2SO 4), 98.078/2 g; 2CO 3), 105.9892/ 2 g. The equivalent weight of a substance may vary with the type of reaction it undergoes. Thus, 4 2−), to manganese dioxide (MnO 2), or to the manganous ion (Mn 2+), with the equivalent weights of 158.038/1 g, 158.038/3 g, and 158.038/5 g, respectively. The number of equivalent weights of any substance dissolved in one litre of solution is called the normality of that solution. This article was most recently revised and updated by

Equivalent weight isn't really a weight-- it's a mass. Mass is the amount of matter in something, while weight is the gravitational pull on a mass. Since we're only dealing with different chemical compounds on Earth, and we're dealing with chemistry, it's acceptable to interchange weight and mass. We'll use the term equivalent weight (EW) for this lesson, and it has a general formula of The n number of equivalents in the equivalent weight formula for an individual element is the absolute value of that element's valence charge. The valence charge of a main group element in families 1 through 4 is simply its family number. For example, lithium is in family 1. Therefore, its valence charge is 1. For a main group element in families 5 through 8, you subtract 8 from its family number. For example, nitrogen is in family 5, and its valence charge is 5 - 8 which is -3. Here's an example we can use. We'll begin with the prompt: What is the equivalent weight of calcium? Equivalent weight (EW) is the molar mass of a substance divided by the n number of equivalents in the substance. Remember that mass is the amount of matter in a substance and weight is the gravitational pull on a mass. A molar mass is the mass of an individual element from the periodic table or, for a compound, the sum of all of the atomic masses in the compound. The n number of equivalents changes slightly depending on the compound you are dealing with, but it's always a charge from the compound. Which charge it is ...

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Definition of Equivalent Weight (also known as equivalent mass): The simplest definition of equivalent mass I can think of is the following: The mass of a compound which will combine with 8g of oxygen or 1g of hydrogen is said to be the equivalent weight of the compound. Lets take an example, $\ce$$ The formula you were talking about gives the equivalent weight of an element (can be extended to be used with ions). Equivalent weight = (Atomic mass)/(Valency) This could be intuitive and obvious for some. Something with valency of 1 would combine with just 1 hydrogen atom, or in other words, a mole of compound with valency 1 would react with 1g of hydrogen. If the element has a valency of 2, then it would love to combine with 2 hydrogen atoms, or in other words, a mole of the element will combine with 2g of hydrogen. By definition, equivalent weight is the mass of the substance that would react with 1g of hydrogen. Therefore you must divide the mass by 2 to get equivalent weight. In fact, this formula based definition of equivalent weight of an element is identical with the definition mentioned earlier in this answer. Previously, we determined that equivalent weight of calcium was 20g using the other definition. We should obtain the same equivalent weight for calcium by using the formula. Equivalent weight = (40g)/2 = 20g Definition of equivalents: Another terminology you might come across is equivalents. Equivalents is similar to moles. The number of moles is given by (mass ...

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