(10 pts) The CO2 level in the atmosphere before the industrial revolution was about 280ppm. The accumulation of the CO2 in the atmosphere continues; hence, in 2019, the average monthly CO2 level via measurement was 415ppm in Hawaii (note: this level had already been reached in the Arctic in June 2012). Calculate the pH of the rainwater (neglecting the effect of other gases) at 25C both before the industrial revolution and today