The pH of a water sample is measured to be 9.33. The concentration of carbonate (i. e., CO32-) is measured to be 6.0 mg/L. Assume the system is closed to the atmosphere and the temperature is 25 oC. Given that pKa1 and pKa2 of H2CO3 are 6.35 and 10.33, respectively,
a. Calculate the concentrations of bicarbonate and carbonic acid, respectively. Express your answers both in mol/L and mg/L.
b. Calculate the alkalinity of the water both in meq/L and mg/L as CaCO3.

Which statement is best described as a atom

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.