Hence, equivalent weight of K2Cr2O7 = (Molecular weight)/6 +1 vote . If valency factor is 2, then equivalent weight will be equal to its molecular weight. In a reaction KMnO4 is reduced to K2MnO4. The equivalent weight of Bayerâs reagent is 1) 31.6 2) 52.6 3) 79 4) 158 51. What will be the equivalent mass of hcl in the reaction : k2cr2o7+14hcl--->2kcl + 2crcl3 + 3cl2 + h2O. In acidic medium , the equivalent weight of K2Cr2O7 ( molar mass M ) is a ) M b - Chemistry - Some Basic Concepts of Chemistry Equivalent weight of an acid. Equivalent weight = molecular weight / X factor = 294 / 6 = = 49 g . = 49.03 g/eq. Normality of sodium thiosulphate = (Weight of Pot.dichromate)/(Volume of sod.thiosulfate consumed)× 0.04904 CONCLUSION From the above experiment it was evident that sodium thiosulpahte can be effectively standardized by using potassium dichromate and iodide with hydrochloric acid and starch as the visual indicator. How to calculate the equivalent weight of K2Cr2O7 in acidic medium if its Mol. Why only ferrous sulphate is not used to make a primary standard solution instead of Thus, 2 2 7Cr O ions gains 6 electrons or in the above reaction, Cr (+ 6) is reduced to Cr (+ 3) so that total decrease in oxidation state of 2 2 7Cr O ion is 6. Entity corresponding to the transfer of a \$\ce{H+}\$ ion in a neutralization reaction, of an electron in a redox reaction, or to a magnitude of charge number equal to 1 in ions.. Please approve my answer if you liked it by clicking on "Yes" given below..! The chromite ore is fused with sodium or potassium carbonate in free access of air. Molar mass of K2Cr2O7 = 294.1846 g/mol This compound is also known as Potassium Dichromate.. 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. redox titration, one equivalent of an oxidizing agent (Cr2O7 2-) reacts with one equivalent of a reducing agent (Fe2+). Explain the colour change that takes place at the end-point of the titration from greenish to violet-red colour. Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa. 294 Eq. 2 K2CrO4 + H2SO4 = K2Cr2O7 + K2SO4 + H2O Molar mass of K2Cr2O7 = 294.1846 g/mol Convert grams Potassium Dichromate to moles or moles Potassium Dichromate to grams. Therefore, the equivalent weight of K2Cr2O7 is (294.19 g/mole) (1 mole/6 eq.) Click here to find In acid medium equivalent weight of K2Cr2O7 is (if molecular weight is M):â¦. is M? This is your answer .. From the half reaction for dichromate it can be seen that one mole of dichromate ion requires six moles of electrons. It is a crystalline ionic solid with a very bright, red-orange color. Assignment volumetric analysis_jh_sir-3591 1. Estimation of Iron: Make up given solution upto the mark with distilled water and shake the flask for uniform concentration. Rinse the pipette with the ferrous solution and pipette out 20ml into a clean conical flask add 20ml of the acid mixture (sulphuric acid and phosphoric acid), and four to five drop of diphenylamine indicator. The molecular weight of K2Cr2O7 is: 2(39.0983 g K/mole) + 2(51.9961 g â¦ It may also be called the equivalent concentration. Detailed explanation first of all find the n factor of H Learn to Create the Famous Tic Tac Toe Game in Our Free Robotics Webinar. (molecular weight)/2 b. LC50: Not available. In other words, \$\pu{1 equiv}\$ is the amount of substance reacting with \$\pu{1 mol}\$ of hydrogen atom. in K2Cr2O7 Cr is in 6+ it is converted in to Cr3+ that is accepting 3 e- for two Cr3+ 6 e-s. hope thats clear Section 3: â¦ In MnSO 4, the oxidation state of Mn is +II. 500+ VIEWS. Q2. (molecular weight)/6 c. (molecular weight)/3 d. same as molecular weight In the standardisation of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is (A) (molecular weight)/2 (B) (molecular weight)/6 (C Refer to the definition of equivalent (IUPAC Gold Book):equivalent entity. wt. 2. The equivalent weight of K2Cr2O7 in acidic medium is expressed in terms of its molecular weight (M) as (1) M/3 (2) M/4 (3) M/6 (4) M/7 - Get the answer to this question by visiting BYJU'S Q&A Forum. Chemical Formula: K2Cr2O7 Section 2: Data Composition Name: Potassium Dichromate Formula: K2Cr2O7 CAS Number: 7778-50-9 % By Weight: 100% Toxicological Data on Compositions: Potassium Dichromate LD50: Not available. For example, the concentration of a hydrochloric acid solution might be expressed as 0.1 N HCl.