3. For sulfurous acid (HL,SO, a diprotic acid), rite the equilibrium dissociatio
ID: 1027262 • Letter: 3
Question
3. For sulfurous acid (HL,SO, a diprotic acid), rite the equilibrium dissociation reactions ha analyt al a2" 4. Write the balanced neutralization reaction for sulfurous acid reacting with sodium hydroxide. 5. 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
3. H2SO3 -------------> HSO3^- (aq) + H^+ (aq)
Ka1 = [HSO3^-][H^+]/[H2SO3]
HSO3^- (aq) -------------> H^+ (aq) + SO32^- (aq)
Ka2 = [H^+][SO3^2-]/[HSO3^-]
4. H2So3 (aq) + 2NaOH (aq) --------------> Na2SO3(aq) + 2H2O(l)
5. HCOOH (aq) + NaOH(aq) ---------------> HCOONa (aq) + H2O(l)
1 mole 1 mole
no of moles of NaOH = molarity* volume in L
= 0.1088*0.02659 = 0.00289 moles
from balanced equation
1 mole of NaOH react with 1 mole of HCOOH
0.00289 moles of NaOH react with 0.00289 moles of HCOOH
no of moles of HCOOH = molarity * volume in L
0.00289 = molarity* 0.005
molarity = 0.00289/0.005 = 0.578M
The concentration of HCOOH is 0.578M
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