| 1. | The combination of anions and cations in water is controlled by |
| dissolving of minerals into water | |
| precipitation of solid minerals and ionization of some constituents | |
| all of this processes |
Max/Min Score: [2.0/0.0]
| 2. | Why the concentration of the magnesium cations (Mg2+) in natural water is less then concentration of the calcium cations (Ca2+) |
| because the magnesium is not as abundant in rock as calcium | |
| because the magnesium salts are less soluble then calcium salts | |
| because the calcium salts are more soluble then magnesium salts |
Max/Min Score: [2.0/0.0]
| 3. | The concentrations of hydrogen (H+) or hydroxide (OH-) ions solution can be equal to zero. |
| True | |
| False |
Max/Min Score: [2.0/0.0]
| 4. | How have to change the concentration of hydrogen (H+) in solution in order to increase its pH in 1? |
| increase in 1 mol/L | |
| decrease by 10 time | |
| decrease in 1 mol/L |
Max/Min Score: [2.0/0.0]
| 5. | What is the concentration of hydroxide (OH-) ions in 1 ml from the solution if it is with pH = 13? |
| 1013 | |
| 6.02 · 1013 | |
| 6.02 · 107 | |
| 6.02 · 1010 |
Max/Min Score: [2.0/0.0]
| 6. | The total alkalinity includes the following compounds: |
| [OH-]; [HCO3-]; [CO32-] | |
| [OH-]; [HCO3-]; [HCO3-], [CO32-] |
Max/Min Score: [2.0/0.0]