need help with environmental homework

Problem 1

a) The proton concentration of a solution is 0.0005 mole/l. What is the pH of this solution?

b) The hydroxide ion concentration of a solution is 0.0005 mole/l, what is the pH of this solution?

Problem 2

1. a)  The pKa value for hypochlorous acid is 7.45, what is Ka value for the same acid?

2. b)  The Ka value for acetic acid is 10-4.75, what is the pKa value for the same acid?

Problem 3

Examine dissociation of acetic acid (CH3COOH) and hydrochloric acid (HCl) at pH 5 and 10. - -
Calculate [Cl ]/[HCl] and [Ac ]/[HAc]

Problem 4

1. a)  What is the oxidation states of sulfur in SO42- and HS- ?

2. b)  Balance the following redox reaction use the half reactions (you have to develop

   the half reactions to get full credit)

SO42- + H+ + CH2O HS- + CO2 + H2O

Problem5

SO42- + H+ + 2CH2O HS- + 2CO2 + 2H2O In above balanced redox reaction, list the following:
Oxidant:
Reductant: