Calculate the concentration [H +] [OH-] and the molar concentration of sulfuric acid in a solution with a pH of 1.4
1. Sulfuric acid is strong, therefore, in water it completely decomposes into hydrogen ions and sulfate ions:
H2SO4 → 2H+ SO42-
2. Find the index of hydroxide ions:
pH = -lg [H +];
pH + pOH = 14;
pOH = 14 – pH = 14 – 1.4 = 12.6;
3.Calculate the concentration of hydrogen and hydroxide ion:
[H +] = 10-1.4 = 0.0398 mol / L;
[OH-] = 10-12.6 = 2.51 * 10-13 mol / L;
4.the concentration of a strong dibasic acid is half the concentration of protons in a solution:
С (H2SO4) = 2 * [H +] = 0.0398: 2 = 0.02 mol / l.
Answer: [H +] = 0.0398 mol / l, [OH-] = 2.51 * 10-13 mol / l, С (H2SO4) = 0.02 mol / l.
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