2007-12-11 06:20:04 · 3 answers · asked by kat 1 in Science & Mathematics ➔ Chemistry
pH is the negative logarithm of the molar concentration. If the concentration is not in molarity, convert it to M.
ph = - log [2.1 x 10^-5] = or - log 2.1 - log 10^-5
Anyway, the easiest way to solve is to change the negative exponent to positive. Thus, -5 becomes + 5. Then, find the log of 2.1. Subtract this from +5, or 5.0 - log 2.1 = pH = 5.00 - .32 or a final answer of 4.68 pH.
2007-12-11 06:30:54 · answer #1 · answered by Aldo 5 · 0⤊ 0⤋
Oh just add water and let it sit for a few days, the great neutralizer...its sooo wet, hehe.
2007-12-11 06:23:07 · answer #2 · answered by Anonymous · 0⤊ 0⤋
pH = -Log[H+]
Log 2.1 x 10^-5 = Log 2.1 + (-5) = 0.322 - 5 = -4.68
So pH = -(-4.68) = 4.68
2007-12-11 06:29:20 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋