A wildlife biologist is interested in testing the pH of the water in a lake. He obtains a 200mL sample of the water and titrates this sample with a 0.050 M NaOH solution. Neutralization of the lake water needs 40mL of the NaOH solution. If the size of the lake can be described as 1.1 km long by 2.3 km wide and has a depth of10m, approximate how many moles of acid are present in the lake water.
a) 10^8 moles
b) 2.5 x 10^5 moles
c) 2 x 10^-8 moles
d) 2.5 x 10 ^-8 moles
e) 10