Asked Oct 23, 2019

Determine [H3O+] of a 0.230 M solution of formic acid.        

Express your answer using two significant figures.

Expert Answer

Step 1


Concentration of solution of formic acid = 0.230 M

Acid dissociation constant for formic acid, Ka = 1.8 × 10-4

The dissociation of formic acid, HCOOH can be written as:

HCOOH + H2O → HCOO- + H3O+    

Since it is a weak acid, the ICE table for this reaction can be written as:


Image Transcriptionclose

[НСООН] [НСОО-1 [Н:О"] Initial conc. (I) Change (C) Equilibrium conc. (E) 0.230 0 0 +x +x -X 0.230-x х х

Step 2

The acid dissociation constant...


Image Transcriptionclose

[НCоо "Н,о+] Ка [НСоон] х. х 1.8 х 104: 0.230 — х х?+ (1.8 х 10+) х - (4.14 х 10-5) — 0 х 3 6.34 х 10-3 : [Н:О"] —х — 6.34 х 10-3


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