VICAIRE - Module 2

Qualitative Hydrology - Chapter 2

 

exercise 1

Defining of Hydrogen index (pH)

  1. The hydrogen ion (H+) concentration in solution is 4·10-3 mol/L. Define the pH of the solution.
  2. Define the hydrogen ion (H+) concentration in solution if the pH of this solution is pH = 4,6.
  3. Define the hydroxide ions (OH-) concentration in the solution with pH = 10,8.

 

exercise 2

Defining of the Ion-Product constant (K)

Define the bicarbonate ion (HCO3-) and carbonate ion (CO32-) concentration in 0,01 M solution of carbonic acid (H2CO3) which pH = 4,18.

For exercise 2 use information from Table 1.

Table 1 Ion - Product constant of the weak acidic in water solution 25 °C

acidic
K
acidic
K
HN3
2.6 · 10-5
H2SO4 - K2
1.2 · 10-2
HNO2
4 · 10-4
H2SO3 - K1
1.6 · 10-2
NH2OH
1.8 · 10-5
H2S - K1
6 · 10-8
H3BrO3
5.8 · 10-10
K2
1 · 10-14
HOBr
2.1 · 10-9
H2CO3 - K1
4.5 · 10-7
H2SiO3 - K1
2.2 · 10-10
K2
4.7 · 10-11
K2
1.6 · 10-12
HCN
7.9 · 10-10

 

Solutions