What happens when K2Cr2O7 reacts with sodium sulphite?

Potassium dichromate (VI), K2Cr2O7 reacts with sodium sulphite, Na2SO3, in an acid solution to give chromium (III) ion. Potassium dichromate (VI), K2Cr2O7 reacts with sodium sulphite, Na2SO3, in an acid solution to give chromium (III) ion and the sulphate ion.

What is K2Cr2O7 solution?

Potassium dichromate, K 2Cr 2O 7, is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications. As with all hexavalent chromium compounds, it is acutely and chronically harmful to health.

What happens when potassium dichromate reacts with stannous chloride?

This is a solution of potassium dichromate, K2Cr2O7, in water. When a colorless solution of tin(II) chloride, SnCl2, is added the orange color becomes green. Adding tin(II) chloride to potassium dichromate yields a green solution. Let’s write a balanced equation for this oxidation-reduction reaction.

What is the equivalent weight of k2cr2o7 in acidic medium?

Hence, the equivalent weight of ${K_2}C{r_2}{O_7}$ in acidic medium will be 49g/eq.

How does ferrous salt reacts with acidified potassium dichromate solution give equation?

Cr2O7−2+6Fe+2+14H+→2Cr+3+6Fe+3+7H2O.

How do you prepare K2Cr2O7 solution?

Preparation of 0.1 N Potassium dichromate (K2Cr2O7) Solution Transfer 6 g of potassium dichromate (K2Cr2O7) to a platinum dish and dry at 120°C for 4 h. Cool in a desiccator. Add 100 mL of water. Swirl to dissolve and when solution is complete, dilute to the mark with water and mix.

Why K2Cr2O7 is a primary standard solution?

Potassium dichromate is a weaker oxidizing agent than KMnO4 or Ce(IV). However, it is a primary standard and its solutions have long lasting stability in acid and are stable to light, to most organic matter, and to chloride ion. It is always used in acid solutions….Potassium Dichromate.

Ion determined Product
ClO3−a Cl−

Why K2Cr2O7 is strong oxidizing agent in acidic medium?

Potassium dichromate is a good oxidizing agent because when elements come into its contact in a chemical reaction they become more electronegative as their atom’s oxidation state increases. Potassium dichromate is a powerful oxidizing-agent, especially in an acidic medium.

Can dichromate oxidize chloride?

Potassium dichromate(VI) can be used in the presence of chloride ions (as long as the chloride ions aren’t present in very high concentration). Potassium manganate(VII) oxidises chloride ions to chlorine; potassium dichromate(VI) isn’t quite a strong enough oxidising agent to do this.

How do you calculate the N factor of K2Cr2O7 in acidic medium?

In acidic medium 1- mole of K2Cr2O7 liberates 3- atoms of oxygen as follows. K2CR2O7+ 4 H2SO4 ====> K2SO4 + Cr2(SO4)3+ 4 H2O + 3(O). {Equivalent weight of an( OXIDISING AGENT) Compound is the weight of the Compound that liberates 8- g of oxygen.}