Calculate the final concentration of all ions in solution after 2 litres of 1.3 M `Ba(OH)_2` is treated with 3 litres of 2.0 M HCl.

Explanation

To solve the problem, we need to calculate the final concentration of all ions in the solution after mixing 2 liters of 1.3 M Ba(OH)₂ with 3 liters of 2.0 M HCl.

### Step 1: Determine the moles of Ba(OH)₂ and HCl

1. **Calculate moles of Ba(OH)₂:**
\[ \text{Moles of Ba(OH)}_2 = \text{Concentration} \times \text{Volume} = 1.3 \, \text{M} \times 2 \, \text{L} = 2.6 \, \text{moles} \]
...