The neutralization of an acid with a base yields a salt (and usually water) in a
ID: 498923 • Letter: T
Question
The neutralization of an acid with a base yields a salt (and usually water) in aqueous solution. Calculate the pH when 43.0 mL of 0.384 M hydrochloric acid is mixed with 43.0 mL of 0.384 M sodium hydroxide solution at 25 °C. Calculate the pH when 43.0 mL of 0.384 M of a certain monoprotic weak acid, HA, is mixed with 43.0 mL of 0.384 M sodium hydroxide solution at 25 °C. For HA, the Ka is 2.5× 10–5.
pH= ?
Calculate the pH when 43.0 mL of 0.384 M of a certain monoprotic weak acid, HA, is mixed with 43.0 mL of 0.384 M sodium hydroxide solution at 25 degree C. For HA, the Ka is 2.5 x 10 ^-5.
pH= ?
Explanation / Answer
when 43 ml 0.384 M HCl mixed with 43 ml 0.384 M NaOH pH resulting is 7
HA----> H+ + A-
0.384-x x x
K = 2.5 x10^ -5 = x^2/(0..384-x)
x = [H+} = 0.000
H+ = 0.0030 x43/1000 =0.000129
OH- = 0.384 x43/1000 = 0.0165
net OH - ions = 0.0165-0.000129 =0.01637
[OH-]= 0.01637x1000/(384x2) = 0.02131
pOH = 0.952
pH = 13.04
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