How did Pajarosa fix the pH of their water?

How did Pajarosa fix the pH of their water?

• A. By using citric acid
• B. By using nitric acid which also provides nitrogen for the plants
• C. By using sulfuric acid
• D. By using phosphoric acid

Answer: (B)

When you’re keeping a plant nutrient solution at the right pH, you want something that lowers acidity but also supports plant nutrition. Nitric acid does exactly that: it lowers the pH of the water and simultaneously adds nitrate nitrogen, which plants can readily use. Other acids would also lower pH but don’t supply nitrogen (phosphoric acid would add phosphorus, sulfuric acid adds sulfur), and a weaker organic acid like citric acid is less practical for steady, long-term pH control in a nutrient solution. So using nitric acid is the best fit because it both adjusts pH and provides essential nitrogen to the plants.

When you’re keeping a plant nutrient solution at the right pH, you want something that lowers acidity but also supports plant nutrition. Nitric acid does exactly that: it lowers the pH of the water and simultaneously adds nitrate nitrogen, which plants can readily use. Other acids would also lower pH but don’t supply nitrogen (phosphoric acid would add phosphorus, sulfuric acid adds sulfur), and a weaker organic acid like citric acid is less practical for steady, long-term pH control in a nutrient solution. So using nitric acid is the best fit because it both adjusts pH and provides essential nitrogen to the plants.