The pH of 500 mL of .1 M HCl is equal to 1. Roughly how much water needs to be added so that the pH=2?

2L
4L
4.5L
5L
5.5L
6L
8L

Answer:
pH is a logarithmic relationship with hydrogen ion concentration, so to get an increase of 1 pH unit, there has to be a 10-fold decrease in hydrogen ion concentration.

500 mL would have to be diluted 10 times, or to a total volume of 5 L. So, 4.5 L of water would have to be added.

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