40. Solving a chemistry problem

55. Solutions of sodium hydroxide and sulfuric acid are prepared at approximately the same normal concentration. When determining their exact values, it was first established that the ratio of equivalent volumes of NaOH and H2SO4 solutions is 0.995. In another analysis, 25 ml of H2SO4 solution was added to a sample of 0.5835 g of chemically pure CaCO3, and 9.25 ml of NaOH solution was used to titrate the residue of the latter. Calculate the values of normal concentrations of NaOH and H2SO4 solutions.