ule muscle Calculate the tissues. In a 1.00 M aqueous K.and pK. of lactic acid.

Question

ule muscle Calculate the tissues. In a 1.00 M aqueous K.and pK. of lactic acid. 13. [14] 400.0 mL of a buffer consist of 0.150 M HNoh and 0.120 M NaNO2. (a) Determine the pH at 25 C of this (b) What is the pH of this solution after the addition of 4.00 mL of 6.0 M NaoH Bonus optional The weak acid oxalic acid reacts completely with sodium hydroxide to produce oxalate ion and water according to the following reaction: ine K for this reaction. 65x Ioz K2 6.1 x 10 s, and Ka (see front page). 0.065 o o o o

Explanation / Answer

13)

400 ml

M = 0.15 M HNO2

M = 0.12 NaNO2

a)

pH

this is a buffer, so use buffer equation

pH = pKa + log(base/acid)

pH = 3.39 + log(0.12/0.15) = 3.293089

b)

when you add V= 4 ml of M = 6 NaOH

mol of base added:

MV = 4*6 = 24 mmol of NaOH = 24*10^-3

then

base inccreases = 400*0.12 + 24 = 72

acid decreases = 400*0.15 -  24 = 36

then

pH = 3.39+ log(72/36) = 3.69102

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