One litre of 0.15 M Na ₂ SO ₃ aqueous solution is mixed with 500 ~mL of 0.2 M K ₂ Cr ₂ O ₇ aqueous solution in acid medium. What is the number of moles of K ₂ Cr ₂ O ₇ remaining in the solution after the reaction?

Step-by-step solution

When 0.15 M Na ₂ CO ₃ (1 L) mixed with 0.2 M K ₂ Cr ₂ O ₇ (5L) than total molarity (M) . aligned M & = M₁ V₁+M₂ V₂ V₃ M & = 0.15 1+0.2 0.5 1.5 M & =0.15 ~mol / L aligned Remaining mole of K ₂ Cr ₂ O ₇=0.2-0.15=0.05 ~mol / L