Aclass is given a demonstration of solution chemistry and solubility equilibria. passage: a 6.57-g sample of niso4•6h2o (molar mass 262.84) is dissolved in enough water to make 50.00 ml of a green solution, and 7.15 g of na2co3•10h2o (molar mass 286.14) is dissolved in enough water to make 50.00 ml of a colorless solution. the two solutions are mixed, and a green precipitate forms. the resulting slurry is divided into two equal portions. to one portion is added an excess of 6 m hcl, which results in the disappearance of the precipitate and a rapid evolution of a gas. to the second portion is added a few milliliters of 6 m nh3. the precipitate dissolves, and a blue solution forms. question: according to the information in the passage, the gas that evolves is: a) sulfur dioxide. b) sulfur trioxide. c) carbon dioxide. d) carbon monoxide.