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  3. a). a buffer solution is made that is 0.337 m in h

A). A buffer solution is made that is 0.337 M in H2CO3 and 0.337 M in KHCO3. (1) If...

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Chemistry

A). A buffer solution is made that is 0.337 Min H2CO3 and0.337 M inKHCO3.

(1) If Ka forH2CO3 is4.20×10-7, what is the pH of the buffersolution?  

(2) Write the net ionic equation for the reactionthat occurs when 0.075 mol NaOHis added to 1.00 L of the buffer solution

B). A buffer solution is made thatis  0.317 Min  H2C2O4and  0.317 Min  KHC2O4.  

(1) If Kafor  H2C2O4is  5.90×10-2, what is the pHof the buffer solution?  

(2) Write the  net ionic equation forthe reaction that occurs when  0.071mol  HBr is addedto  1.00 L of the buffersolution.  

Use H3O+ instead ofH+.

  

Answer & Explanation Solved by verified expert
4.4 Ratings (601 Votes)

Pka = -logKa

         = -log4.2*10-7

         = 6.3767

PH = Pka + log[KHCO3]/[H2CO3]

         = 6.3767 + log0.337/0.337

         = 6.3767

2. naOH -------> Na+ + OH-

       no of moles of H2C2O4 = 0.317

      no of moles of KHC2O4   = 0.317

      Ka = 5.9*10-2

     PKa = -logka

             = -log0.059   = 1.229

     PH   = Pka + log[KHC2O4]/[H2C2O4]

    PH   = 1.229 + log0.317/0.317

    PH = 1.229

HBr +H2O ------> H3O+ + Br-

0.071 M                0.071M

            = 1.229 + log
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