How many grams of HNO3 are needed to make 315 mL of a solution with a pH of 2.60? The molar mass of HNO3 is 63.02 g/mol.
1. 19.9 g
2. 0.502 g
3. 0.158 g
4. 1.25 × 10−5 g
5. 0.0498 g
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