Calculate the molarity of the HCl solution, the [H3O+], and the pH. For a strong acid such as HCl, the [H3O+] is the same as the molarity of the HCl solution.
HCl + H2O------ H3O+ + Cl-
How to solve this problem. I don't get it.
2007-03-06 02:52:50 · 3 answers · asked by shortydidi03 2 in Science & Mathematics ➔ Chemistry
.0020 mole / 2 L = .001 molarity
= 1 * 10^-3 molarity
pH = 3
Though pH is generally expressed without units, it is not an arbitrary scale; the number arises from a definition based on the activity of hydrogen ions in the solution. The pH scale is a reverse logarithmic representation of relative hydrogen proton (H+) concentration. Most scales are linear in nature and progress in a smooth incremental manner. On the pH scale, a shift up in value by one number represents a ten-fold decrease in value. For example, a shift in pH from 2 to 3 represents a 10-fold decrease in H+ concentration, and a shift from 2 to 4 represents a one-hundred (10 × 10)-fold decrease in H+ concentration.
2007-03-06 03:00:49 · answer #1 · answered by DanE 7 · 0⤊ 0⤋
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2016-05-16 06:02:32 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The molarity of the HCl is just 0.0020mol / 2dm3 = 0.001 moldm-3
As HCl is a strong acid [H3O+ or H+] = 0.001 moldm-3
pH = -log([H+) = -log(0.001) = 3
2007-03-06 02:57:18 · answer #3 · answered by blastedsand 2 · 0⤊ 0⤋