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.

Explanation:

The application of the henderson hasselbach equation and the normal PH equation was used to approach the problem. Appropriate substitution were made as is shown in the attached files.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8