WAEC - Chemistry (2024 - No. 35)
Pure water contaminated with quicklime will have a pH of
1
6
7
8
Paliwanag
Pure water contaminated with quicklime (calcium oxide) will have a highly alkaline pH, significantly above 7. The reason being that quicklime (CaO) reacts vigorously with water to form slaked lime (calcium hydroxide, Ca(OH)₂), a strong base.