Answer Happy

Experiment 1. Preparation of a Mohr's salt standard solution The precisely measured weight of 3.0 g of Mohr's salt was 3.1256 g. It was dissolved in water and diluted to 200 mL in a 200 mL measuring flask. Calculate the concentration (mol L¹) of this Mohr's salt standard solution (Mohr's salt: FeSO4(NH4)₂SO4-6H₂O). Concentration of the Mohr's salt standard solution mol L-¹¹ Experiment 2. Standardization of an 8.3 x 10-³ mol L-1 K₂Cr₂O7 solution (determination of the concentration) Put 20 mL of the Mohr's salt standard solution in experiment 1 in a conical beaker with a volumetric | pipette, and 15 mL of phosphoric acid and water were added to make about 100 mL. Next, sodium diphenylamine sulfonate indicator was added, and titration was performed with the 8.3 × 10³ mol L²¹ K₂Cr₂O₂. Calculate the approximate titration value (mL) needed to reach the end point. Titration value of the 8.3 × 10-³ mol L-¹ K₂Cr₂O₂ solution about mL