A 0.200 M K2SO4 solution is produced by ________.

Ascorbic acid (vitamin C, C₆H₈O₆) is a water-soluble vitamin. A solution containing 80.5 g of ascorbic acid dissolved in 210 g of water has a density of 1.22 g/mL at 55 °C. Calculate (d) the molarity of ascorbic acid in this solution.

Baking soda (sodium bicarbonate, NaHCO₃) reacts with acids in foods to form carbonic acid (H₂CO₃), which in turn decomposes to water and carbon dioxide gas. In a cake batter, the CO₂(g) forms bubbles and causes the cake to rise. (b) The density of baking soda is 2.16 g/cm³. Calculate the concentration of lactic acid in one cup of sour milk (assuming the rule of thumb applies), in units of mol/L. (One cup = 236.6 mL = 48 teaspoons).