A typical vitamin C tablet (containing pure ascorbic acid, H2C6H6O6) weighs 500 mg. One vitamin C tablet is dissolved in enough water to make 170.0 mL of solution. Calculate the pH of this solution. Ascorbic acid is a diprotic acid. For H2C6H6O6, Ka1 = 7.9×10-5 and Ka2 = 1.6×10-12

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.