1) Write the balanced neutralization reaction for sulfurous acid reacting with s
ID: 1027267 • Letter: 1
Question
1) Write the balanced neutralization reaction for sulfurous acid reacting with sodium hydroxide.
2) For sulfurous acid(H2SO3 , a diprotic acid), write the equilibrium dissociation reactions and the corresponding expressions for the equilibrium constants, Ka1 and Ka2
3) In a typical titration experiment a student titrates a 5.00 mL sample of formic acid (HCOOH), a monoprotic organic acid, with 26.59 mL of 0.1088 M NaOH. At this point the indicator turns pink. Calculate the # of moles of base added and the concentration of formic acid in the original sample.
Explanation / Answer
1)
H2SO3 + 2 NaOH ------------------------> Na2SO3 + 2H2O
2)
H2SO3 <---------------------> HSO3- + H+ , Ka1
Ka1 = [HSO3-] [H+] / [H2SO3]
HSO3- <-----------------------> SO3-2 + H+ , Ka2
Ka2 = [SO32-][H+]/[HSO3-]
3)
moles of base added = 26.59 x 0.1088 /1000
= 2.89 x 10^-3
moles of acid = moles of base
moles of acid = 2.89 x 10^-3
volume = 5 mL = 5 x 10^-3 L
concentration = moles / volume
= 2.89 x 10^-3 / 5 x 10^-3
= 0.579 M
concentration of formic acid = 0.579 M
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