Milk of Magnesia is an over-the-counter medication commonly used as an antacid and a laxative. It contains magnesium hydroxide, which gives it its alkaline properties.

pH is a measure of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.

The correct answer in this case is option 3: 10. This means that the pH value of Milk of Magnesia is alkaline. It is important to note that a pH value of 10 is much higher than the neutral pH of 7, indicating a strong alkalinity.

Alert - correct answer should be 14. The provided answer, 10, is incorrect. Milk of Magnesia has a pH value of approximately 10.5 to 11.5, which is still highly alkaline but not as high as a pH of 14.