Hence, their equivalent weights are 1/1 =1, 40/2 = 20 and 16/2 = 8 respectively. 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. In Mn 2 O 3, the oxidation state of Mn is + III. What will be the equivalent mass of hcl in the reaction : k2cr2o7+14hcl--->2kcl + 2crcl3 + 3cl2 + h2O. 2. âºâºPotassium Dichromate molecular weight. In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr207 is (1) Molecular weight/2 (2) Molecular weight/6 (3) Molecular weight/3 (4) same as molecular weight - â¦ For example, the concentration of a hydrochloric acid solution might be expressed as 0.1 N HCl. 500+ SHARES. This is your answer .. Calculate the theoretical yield of the reaction mentioned above 3.What is the theoretical percentage by weight asked by Lisa on January 17, 2014 Molar mass of K2Cr2O7 = 294.1846 g/mol This compound is also known as Potassium Dichromate.. As with all hexavalent chromium compounds, it is acutely and chronically harmful to health. Percentage Composition and Empirical Formula - Part 1. Calculate the equivalent mass of hcl in the given reaction : k2cr2o7+14hcl--->2kcl + 2crcl3 + 3cl2 + h2O Find the answer to this question along with unlimited JEE Chemistry questions and prepare better for â¦ 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. In other words, \$\pu{1 equiv}\$ is the amount of substance reacting with \$\pu{1 mol}\$ of hydrogen atom. The molecular weight of K2Cr2O7 is: 2(39.0983 g K/mole) + 2(51.9961 g â¦ Molecular weight calculation: 39.0983*2 + 51.9961*2 + 15.9994*7 Q2. âºâºK2Cr2O7 molecular weight. 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. Assignment volumetric analysis_jh_sir-3591 1. The basicity of an acid is equal to furnishable hydrogen ion (proton) in its aqueous solution. Potassium Dichromate is used to standardize Sodium Thiosulfate solutions. X factor in acidic medium = 6. Equivalent weight of an acid. Explain the colour change that takes place at the end-point of the titration from greenish to violet-red colour. Balance K2Cr2O7 +H2C2O42H2O --> K[Cr(CrC2O4)2(H2O)2]2H2O +CO2+ H2O 2. Section 3: â¦ Molecular weight of KMnO4 is "M". (molecular weight)/2 b. Potassium Dichromate K2Cr2O7 Molar Mass, Molecular Weight. 294 Eq.