Questions 9 and 10

Solve the problem. 9) The pH of a solution ranges from 0 to 14. An acid has a p H less than 7. Pure water is neutral and enla has a pH of 7. The pH of a solution is given by pH = - log x where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the PH = 4.4. A) 3.98 x 10-4 B) 2.51 x 10-4 C) 3.98 x 10-5 D) 2.51 x 10-5 10) What principal invested at 8% compounded continuously for 4 years will yield $1190? Round the 00 answer to two decimal places. e past era A) $627.48 B) $ 864.12 C) $1188.62 D) $1638.78