Let's say you have to calculate the number of H+ ions in 100 mL of a solution with a pH of 6. To do this:
Find the [H+] ions concentration:
[H+] = 10-pH = 10-6.0 = 1.0×10-6 mol/L
Write the equation to find moles:
moles = molarity (mol/L) × volume (L)
Convert mL to L: 100 mL/1000 = 0.1 L.
Calculate the moles of H+:
moles = 1.0×10-6 mol/L × 0.1 L = 1.0×10-7 mol
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