Cooks use baking soda to make cakes light and fluffy. You might have used baking soda yourself. Baking soda is NaHCO3. A 0.1 M solution of baking soda and water has a [H+] of about 4.0 X 10^-9. (You may prefer to think of the Hydronium ion concentration, [H3O+], as 4.0 X 10-9.) write the formula for the calculation of pH, and then show each job as you calculate the pH of 0.1 M solution of baking soda.

Question

micahm · Answer

www.chemistryland.com/CHM130S/LabHelp/Experiment12/Exp12.html

cuanchi · Answer

NaHCO3 -> Na+ + HCO3-    (dissociate completely it is a ionic compound)

HCO3- + H20 -> H2CO3 + OH-  Kb = Kw/Ka        Ka= 4.3 x 10-7 (carbonic acid  Ka) (Hydrolysis ) 

calculate [OH-] whit the value of Kb and a ICE table and the equilibrium expression or by using the approximation formula  for the x is too small
$$[OH ^{-}]=\sqrt{\frac{ Kw }{ Ka }\times Cs}$$
pOH= -log [OH-]
pH= 14-pOH