What is the formula for equivalent weight?
Equivalent Weight = Molecular weight/ Valency Also, read: Chemical Reaction.
What is meant by equivalent weight?
equivalent weight, in chemistry, the quantity of a substance that exactly reacts with, or is equal to the combining value of, an arbitrarily fixed quantity of another substance in a particular reaction.
What is equivalent weight class 11?
The amount of substances that completely react with each other in the reaction is called equivalent weight in chemistry. Equivalent weight = molecular weight / X.
What is equivalent weight unit?
The equivalent weight of an element is the mass which combines with or displaces 1.008 gram of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine. These values correspond to the atomic weight divided by the usual valence; for oxygen as example that is 16.0 g / 2 = 8.0 g.
Why do we use 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.
What is normality and equivalent weight?
Normality is the number of equivalent weights, EW, per unit volume. An equivalent weight is the ratio of a chemical species’ formula weight, FW, to the number of its equivalents, n. EW=FWn. The following simple relationship exists between normality, N, and molarity, M. N=n×M.
What is equivalent weight of NaOH?
Hence, the equivalent weight of NaOH is 40g/mol.
What is n factor in normality?
n factor is atomic weight or molecular weight by equivalent weight. n factor for acids is its basicity,ie, no of replaceable hydrogen ion per molecule.
What is gram equivalent example?
Its unit is atomic mass unit, the amount of substance in gram is equal to the equivalent weight known as the gram equivalent weight. For example, hydrogen has atomic weight of 1.008 and the valence electron in hydrogen is 1, so its equivalent weight is 1.008.
What is unit of normality?
What is Normality? Normality is a measure of concentration that is equal to the gram equivalent weight of solute per litre of solution. Gram equivalent weight is a measure of the reactive capacity of a molecule*. Unit of normality is Eq/L. “N” is the symbol used to denote normality.
What is equivalent weight HCl?
Therefore, the equivalent mass of HCl is 85.1g.
What is the SI unit of normality?
The units of normality are N or eq L-1. The unit of molarity is M or Moles L-1.
What is equivalent weight in titration?
The equivalent weight of an acid is the mass of acid required to generate one mole of hydrogen (hydronium) ion in aqueous solution. For an acid like HCl, which has only one ionizable hydrogen, the equivalent weight is the same as the molar mass.
What is equivalent weight of KMnO4?
The equivalent weight of KMnO4 in acidic medium is 31.6 .
What is equivalent weight of NaOH?
Hence, the equivalent weight of NaOH is 40g/mol.
What does equivalent mean in chemistry?
An equivalent (symbol: officially equiv; unofficially but often Eq) is the amount of a substance that reacts with (or is equivalent to) an arbitrary amount (typically one mole) of another substance in a given chemical reaction.
How is equivalent weight calculated?
Equivalent Weight is calculated by taking the molar mass divided by n number of equivalents. The molar mass is the molecular weight. The n number o…
What is the formula for equivalent weight?
The Equivalent Weight (EW) formula is:
EW = Molar Mass / n number of equivalents
Where “n” number of equivalents is the quantity of charge depend…
What is the difference between equivalent weight and molecular weight?
Molecular weight is the total atomic mass of a molecule for a compound. Equivalent weight, on the other hand, is the portion of the compound’s mole…
What is the equivalent weight of NaOH?
To determine the equivalent weight of NaOH, first it needs to be determined what type of substance it is. NaOH is a base; therefore, the n number…
What is equivalent weight in chemistry?
Equivalent weight in chemistry is the most common term used in solution and some basic concept of chemistry in the physical chemistry part. Here, we will have covered the important topics related to the equivalent weight of metal. What is the equivalent weight definition in chemistry?
What is the molecular weight of aluminium hydroxide?
The molecular weight of the aluminium hydroxide base is 78 g/mol.
What is the valency factor of aluminium cation?
The number of positive charge on aluminium cation is three . Therefore, its valency factor or X value will be three .
What is the valency factor of a base?
For the base, X (valency factor) is the acidity. Acidity- Acidity is the number of hydroxyl ions or hydroxide ions released by a base. In the case of calcium hydroxide base Ca (OH)2. Ca (OH)2 →Ca+ + 2 OH-. The number of hydroxyl ions released by the calcium hydroxide base is 2.
What is the molecular weight of sulphuric acid?
The molecular weight of sulphuric acid is 94.
What is equivalent weight?
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, …
What is the n equivalent weight formula?
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.
What is the n number of equivalents?
For acids or bases, the n number of equivalents is the number of hydroxide ions in the base (OH -1) , and the number of hydrogen ions in the acid (H +1 ). For ionic compounds, the n number of equivalents is the absolute value of the net positive or net negative charge in the compound. To unlock this lesson you must be a Study.com Member.
What is the molar mass of calcium?
The molar mass of calcium is 40.78 g and its valence charge is +2. Its equivalent weight is solved as follows:
What is a molar mass?
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 in this part of this equation is the quantity of charge in an equation, and what charge is used depends on the scenario. Let’s look at a few scenarios where the n number …
What is the valence charge of lithium?
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.
Is weight a mass?
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.
What is equivalent weight?
Equivalent weight, in chemistry, the quantity of a substance that exactly reacts with, or is equal to the combining value of, an arbitrarily fixed quantity of another substance in a particular reaction.
What is the definition of stoichiometry?
stoichiometry. Stoichiometry, in chemistry, the determination of the proportions in which elements or compounds react with one another.
What is an encyclopedia editor?
Encyclopaedia Britannica’s editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. …
What Does Equivalent Weight Mean?
The equivalent weight of any substance is the mass of the substance in grams that combines with or is chemically equivalent to eight grams of oxygen or one gram of hydrogen. In other words, it is equal to the mass of the substance in grams that would react with or replace one gram of hydrogen. Equivalent weight is expressed as the ratio of atomic weight or molecular weight to the valence.
What is the EW of a metal?
Equivalent weight (EW) is an important parameter to understand the corrosion rate (also called the mass loss rate) of a metal when it undergoes the corrosion process.
How to find the equivalent weight of an ion?
To find the equivalent weight of an ion, divide its ion weight by the amount of charge present on it.
What is the equivalent weight of oxygen?
Therefore, in most of the reactions, the equivalent weight of oxygen is 16/2 = 8. In most reactions of chlorine has 1 valency. Therefore, in most of the reactions, the equivalent weight of chlorine is 35.5/1 = 35.5.
What is the number obtained by dividing the atomic mass of an element by its valency called?
The number obtained by dividing the atomic mass of an element by its valency is called the Equivalent Weight of that element.
How much oxygen is equivalent to aluminum?
The equivalent weight of oxygen is 8. 96 grams of oxygen combine with 108 grams of aluminum. So 8 grams of oxygen will combine with 9 grams of aluminum. So the equivalent weight of aluminum is 9.
How much magnesium is 24 grams?
Since 24 grams of magnesium is equal to 2 grams of hydrogen, the equivalent weight of magnesium is 12.
How much hydrogen is equivalent to 8 grams of oxygen?
Since 4 grams of hydrogen react with 32 grams of oxygen, so 1 gram of hydrogen will react with 8 grams of oxygen. So the equivalent weight of oxygen is 8.
What is the gram equivalent of a substance?
A gram equivalent of a substance has the same quantity as its equivalent weight.
What is the utility of equivalent weights?
The utility of equivalent weights is amazing . In any reaction, N equivalents of any compound on the reactants side reacts with N equivalents of another reaction to produce N equivalents of the product (s).
What is the equivalent weight of calcium?
Now by the definition of equivalent weight mentioned earlier, the equivalent weight of calcium is 20g.
What is equivalents in math?
Equivalents is similar to moles. The number of moles is given by (mass of the compound)/ (molecular mass). Similarly the number of equivalents is given by (mass of the compound)/ (equivalent weight).
What is equivalent statement?
An equivalent statement is, 1 equivalent of calcium reacts with 1 equivalent of oxygen to produce 1 equivalent of calcium oxide.
Why is the mass of 1 mole of either its equivalent weight?
Wts. because the reaction it participates in can have all sorts of different stoichiometries. Eq. Wt. should only be used when the reaction is understood – and often is used to compare two different compounds reacting in the “same” reaction eg:
What is one equivalent?
Now we need to standardise the definition of one equivalent. To be more exact one equivalent is the amount of a substance which is needed to react with 1 g of H2.
What is the equivalent ratio of a reaction?
Suppose we were to say that A and B react in the ratio of 1 equivalent to 1 equivalent. The equivalent ratio of the reaction is ALWAYS 1:1.
What does gram equivalent mean?
gram e·quiv·a·lent. 1. the weight in grams of an element that combines with or replaces 1 g of hydrogen; 2. the atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction;
What is the molecular weight of a substance expressed in grams?
gram molecular weightthe molecular weight of a substance expressed in grams; one gram molecular weight of a molecular substance contains one mole of molecules. See also mole1.
What does “molecular weight” mean?
the atomic or molecular weight in grams of an atom or group of atoms involved in a chemical reaction divided by the number of electrons donated, taken up, or shared by the atom or group of atoms in the course of that reaction;
What is the weight of a molecule of a chemical compound?
molecular weightthe weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms and is dimensionless. Abbreviated Mol wt or MW. Although widely used, the term is not technically correct; relative molecular mass is preferable.
What is the atomic weight of an atom?
atomic weightthe sum of the masses of the constituents of an atom, expressed in atomic mass units(or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000. Abbreviated At wt.
What does LBW mean in chemistry?
See also mole 1. low birth weight (LBW) see under infant. molecular weight the weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms and is dimensionless. Abbreviated Mol wt or MW.
What is the meaning of apothecary weight?
apothecaries’ weight see apothecaries’ system. atomic weight the sum of the masses of the constituents of an atom , expressed in atomic mass units (or daltons ), in SI units ( i.e., kilograms), …
For Acids
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Taking an example of sulfuric acid as follows:- H2SO4+ 2OH-→ 2H2O + SO42- The equivalent weight of the acid can be determined by determining the individual molecular weight of each of the elements from the periodic tableand firstly adding them together. This will give us the molecular weight of the acid. 2(1) + (32) + 4(16) = 98.0. The acid is seen to be donating two prot…
For Bases
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The reasoning for the base is the same. For example, ammonium hydroxide can accept a proton in solution to become an ammonium ion. NH4OH + H+→ H2O + NH4+ The molecular weight of the hydroxide will be as follows. (14) + (4)(1) + (16) + 1 = 35.0. Here, since only one proton is accepted, thus the equivalent weight is equal to 35.0/1 = 35.0. For the base, X (valency factor) is …
Equivalent Weight of The Metal in Salt Or Compounds
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1. Aluminium Chloride Step by Step Calculation for Finding the Equivalent Weight of Aluminium Salts For the metals, X (valency factor) is the total positive charge on the positive ion (cation). In the case of aluminium chloride salt Al(Cl)3 AlCl3→ Al3++ 3Cl- The number of positive charges on aluminium cation is three. Therefore, its valency factor or X value will be three. The molecular w…
Did You Know?
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Equivalent weight is used in the calculation of normality. The normality of a solution is defined as the number of gram equivalents of the solute present per litre of the solution. It is represented by the symbol, N. Normality = gram equivalent of the solute/volume of the solution in litres The number of gram equivalents of the solute is calculated…
Summary
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The equivalent masses of acids, bases, and salts are calculated as follows: Equivalent mass of an acid = molecular mass of the acid/basicity. Equivalent mass of a base = molecular mass of the base/acidity. Equivalent mass of a salt = molecular mass of the salt/total positive valency of metal atoms.