Final answer:
To determine the pH of a 0.00046 M Ca(OH)₂ solution, calculate the hydroxide ion concentration. The solution will be basic with a pH higher than 7.
Step-by-step explanation:
The pH of an aqueous solution of 0.00046 M Ca(OH)₂ can be calculated by first determining the hydroxide ion concentration. Since Ca(OH)₂ is a strong base, it completely dissociates in water, releasing two hydroxide ions for each unit of Ca(OH)₂. Therefore, the concentration of hydroxide ions, [OH−], will be 2 × 0.00046 M, which equals 0.00092 M.
Next, the pOH can be calculated using the formula pOH = −log[OH−], which gives pOH = −log(0.00092). After calculating this value, we subtract it from 14 to get the pH, because pH + pOH = 14 in any aqueous solution at 25°C. The final pH of the solution is therefore higher than 7, which indicates it is basic.