If an input is given then it can easily show the result for the given number. The concept of equivalent weight allows you to explore the fact that atoms combine to form molecules in fixed number ratios, not mass ratios. Common lab calculations california state university. This generalized definition is used for the calculation of equivalent weight. The equivalent weight of an element or radical is equal to its atomic weight atomic weight, mean weighted average of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. A 1 normal 1 n solution contains 1 equivalent weight of solute per liter of solution. Therefore you must divide the mass by 2 to get equivalent weight. Determining epoxide equivalent and amine value of resins txdot designation.
Curative calculation for polymer binder and additives. Epoxy equivalent weight eew epoxy equivalent weight eew is a ratio of the weight of a polymer molecule molecular weight to its number of epoxy groups. The weight of a substance that will combine with or replace one mole of hydrogen or onehalf mole of oxygen. Equivalent weight definition of equivalent weight by. Every substance may be assigned an equivalent weight. In its most general usage, it is the mass of one equivalent, that is the mass of a given substance which will. Equivalent weight definition and meaning collins english. What is the meaning of equivalent weight and its formula. Axial bearing load the mean axial load is calculated by considering the dynamic axial forces on the axlebox. Equivalent weight also known as gram equivalent is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. Equivalent weight of alloy can be determined using the below formula.
Tes global ltd is registered in england company no 02017289 with its registered office at 26 red lion square london wc1r 4hq. Equivalent weight is the atomic weight of an element or radical divided by the valence it assumes in a chemical compound. The molecular weight of naoh is 40 equivalent weight 40, and therefore 0. It may also be called the equivalent concentration. The equivalent weight of an element or radical is equal to the ratio of its atomic weight or formula weight devided by its valency. It is necessary to calculate the mass of a solid acid which will react with about 20 cm3 of this solution for a titration using a 25 cm3. Equivalent weight financial definition of equivalent weight. Sep 25, 2019 the normality of a solution is the gram equivalent weight of a solute per liter of solution. In science, the equivalent weight of a solution is the molecular weight of the solute, or dissolved substance, in grams divided by the valence of the solute. Its concerntration is measured by weight percent nco. Equivalent weight is the mass of one equivalent, that is the mass of a given substance which. What is the electrochemical equivalent weight and density of inconel. Theoretical equivalent weight of sulfuric acid h 2 so 4 49.
By definition, equivalent weight is the mass of the substance that would react with 1g of hydrogen. For example, if an index consisting of 10 stocks is weighted for price, this means that the average price of the stocks will move more when the stocks with higher price move. Equivalent weight article about equivalent weight by the. Some manufacturers specify this number directly and others give the percent nco by weight isocyanates or the hydroxyl number in gohg polymer resins. It is essential to determine the epoxy equivalent weight e. Since molecular weight is a very small quantity, we express it in terms of mole. The equivalent weight may be equal to the formula weight molecular weight. Equivalent weight of the oxygen can be determined by getting the metal and metal oxide. This website and its content is subject to our terms and conditions.
Determination of equivalent weight amounts to determining valence factor, x. This means that if the equivalent weight of na is 23 gram and the equivalent weight of cl is 35. We define the equivalent weight of a substance element or compound as. Equivalent weight of the substance is defined as the weight of the substance that contains or reacts with 1. The term equivalent weight had a distinct sense in gravimetric analysis. Calculate the gram equivalent weight, normality of a solution, milliequivalent per. Equivalent weight definition is 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. Calculation of variable and gram equivalent weight formulas. Nov 11, 2017 normality is defined as the number of equivalent weights per liter of a solution. The hydrogen equivalent is the calculation of the molecular weight of the polymanine divided by the amount of the active hydrogen atom. For pure elements, the equivalent weight is calculated as.
Epotuf 37108 aliphatic bisa bisf blend 100 2 1,400 eew 190 high solids or 100% solids coatings and flooring, waterwashable grouts, adhesives, composites 100% reactive bisa bisf epoxy resin blend diluted 12% by weight with epotuf 37058, provides better thermal and chemical resistance than bisa based diluted epoxies ansi 118. The number of parts by weight of it, that will combine with or displace directly or indirectly 1. The equivalent weight calculatoracid an online tool which shows equivalent weight acid for the given input. Because the material is a polymer and all man made polymers have a polydispersity best slightly greater than 1. Mar 02, 2014 equivalent weight of alloy can be determined using the below formula. This formula is widely used to express grams of substance in terms of gram. Free ductwork tables for sizing and construction of hvac air ducts. The normality of a solution is the gram equivalent weight of a solute per liter of solution.
Equivalent weight definition of equivalent weight by the. Download hvac duct construction tables according to smacna and rule of thumbs pdf. The actual points can be very different depending on the type, the way of being prepared cooked, etc. Active hydrogen atom is the one which is connected with a nitrogen. Hydroxyl equivalent weight hydroxyl number 17 x 100 %hydroxyl 42 x 100 %nco wt of nco to cure 100g of polyol parts of polyol to satisfy 100g of nco since we have 95. The equivalent weight of an element is the mass which combines with or displaces 1. October 2014 note 1the presence of water at any time in this procedure will invalidate the results.
Substances react with each other in stoichiometric, or chemically equivalent, proportions, and a common standard has been adopted. It is indicated using the symbol n, eql, or meql 0. The calculation is based on the equivalent weight ew of each compound. Equivalent weight also known as gram equivalent is a term which has been used in several contexts in chemistry. Duct sizing and construction tables according to smacna pdf. Equivalent weight calculator is available online at. So, we can first calculate the equivalent weight of each element in the compound and then add them up. The different definitions came from the practice of quoting gravimetric results as mass fractions of the analyte, often expressed as a percentage. Weight either gross weight, net weight, or tare weight. Appendix 1 calculation of stoichiometric weight of curing.
Chemistry assignment help general chemistry calculation of equivalent weight assignment help equivalent weight of an element can be calculated using the composition of the compound of the given element with any other element whose equivalent weight. Weigh out about 5 g of dry sodium hydroxide pellets on a watch glass and transfer quantitatively to a 500 ml pyrex beaker and dissolve in about 300 ml carbon dioxide free distilled water. I know the amine number of a polymer, and the viscosity range. Calculation of variable and gram equivalent weight.
Byjus equivalent weight calculatoracid is a tool which makes calculations very simple and interesting. In a laboratory setting, one can obtain the experimental equivalent weight simply by analyzing a known amount of sample by using volumetric analysis. Equivalent weight calculator online free calculator. I know the amine number of a polymer, and the viscosity. Lesson objective after completing this lesson, you should be able to.
Equivalent weight an overview sciencedirect topics. Mass is the amount of matter in something, while weight is the gravitational pull on a mass. Ka f0 fad g where fad dynamic axial factor fa ka equivalent bearing load p the equivalent bearing load to be used for the l10 basic rating life calculation either as. Oxygen assumes a valence of 2 and has an atomic weight of 15. Calculate total chlorine emissions as a chloride equivalent convert the hcl and cl 2 results from step 1 to a cl equivalent using equation 2 equation 2. Normality is widely used in analytical chemistry because it simplifies many of the calculations involving solution concentration. For example, the concentration of a hydrochloric acid solution might be expressed as 0.
Calculation of equivalent weight, determination of. A related term was the equivalence factor, one gram divided by equivalent. Equivalent weight predicts the mass of a substance that will react with one atom of hydrogen in an acidbase analysis such as a titration. That is, while element masses differ, when it comes to bonding with other atoms, the number of atoms, expressed in moles, is the determining factor in how much of a given element or compound will react with a given mass of another. You can determine the equivalent weight by dividing 56. It is a resourceful practice guide for preparation of the naplex, fpgee, ptcb and california pharmacy board exams. Equivalent weight calculator online free calculator byjus. Reference guide for pharmaceutical calculations krisman.
This calculator estimates the equivalent weight by oxide method. Epoxy equivalent weight of sample nvm fraction normality of hbr ml of hbr. Calculation of stoichiometric weight of curing agent. Substances react with each other in stoichiometric, or chemically equivalent, proportions, and a. 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. For oxidationreduction reactions, one equivalent donates or. How do i find corrosion rate from polarization graph. Cloudiness in the sample or test solutions indicates the presence of water. The table below can be used to compare equivalent diameters for rectangular and round circular ducts, ductwork sizing, friction loss, sheet metal gauges, etc. 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. Normality is defined as the number of equivalent weights per liter of a solution. In other words, by knowing the weight of the sample used in the analysis and the number of equivalents of the titrant used in the titration, one can then calculate the experimental equivalent weight based on the data. In fact, this formula based definition of equivalent weight of an element is identical with the definition mentioned earlier in this answer.
1543 1474 1476 1063 473 195 276 1311 988 1170 365 137 471 887 1547 171 1356 306 1496 1119 1118 934 381 51 1145 546 289 1056 1345 559 836 1431 504 229 63