Dissolve 115.3 grams of mixture X consisting of MgCO3 and RCO3 with 500 ml of dilute H2SO4 solution, and obtain solution A, solid B and 4.48 liters of CO2 (standard specification). To evaporate solution A to obtain 12 grams of anhydrous salt. Heat solid B to constant mass to yield 11.2 liters of CO2 (standard design) and solid D. 1. Calculate the molar concentration of the H2SO4 solution used.
2. Calculate the mass of solids B and D