One type of indigestion tablet contains magnesium hydroxide. This base neutralises stomach acid as shown by the balanced chemical equation Mg(OH)2 + 2HCl → MgCl2 + 2H2O
How does the pH in the stomach change after taking the tablets?

Magnesium hydroxide reduces stomach acid, and increases water in the intestines which may induce bowel movements. Magnesium hydroxide is also used as an antacid to relieve indigestion, sour stomach, and heartburn

Explanation:

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acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.