Homework Answers
2.
(a) with pH = 5.472
pH = -log[H+]
[H+] = 3.373 x 10^-6 M
the [H+] would have 3 significant figures which makes the value accurate with rounded off figure.
(b) Formula weight of unknown gas
moles (n) = PV/RT
with values from above,
n = 0.724 x 0.250/0.082056 x 298.2
= 0.0074 mol
formula weight = grams/moles
= 0.213/0.0074
= 28.795 g/mol
maxima = 28.310 g/mol
minima = 29.299 g/mol
uncertainty = +/-0.009
(c) The main uncertainty comes from temperature value
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To how many significant figures is [H+] known in a solution
with pH =5.472?.....
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