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Q1)What is the common ion in a solution that is saturated with the salts Na3PO4, Na2SO4,...

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Chemistry

Q1)What is the common ion in a solution that is saturated withthe salts Na3PO4, Na2SO4, and AgCl?

Ag+, Na+, po4^3-, so4^2-, cl-

Q2What is the pH of a buffer made by adding 50.0mL of 0.200M HClto 100.0mL of 0.400M NH3? pKa(NH4+)=9.26.

Do NOT use scientific notation!

Answer & Explanation Solved by verified expert
4.5 Ratings (882 Votes)

Q1    Na2SO4 --------. 2Na+ + So42-

      Na3PO4 --------->3Na+ + Po43-

      AgCl ---------. Ag+ + Cl-

Ag+, Na+, po4^3-, so4^2-, cl-

Q2    NH3 + HCl ----------> NH4Cl

no of moles of HCl = molarity * volume in L

                              = 0.2*0.05 = 0.01 moles

no of moles of NH3   = 0.4*0.1 = 0.04 moles

                NH3 +   HCl ----------> NH4Cl

I                 0.04     0.01                 0

C              -0.01    -0.01               0.01

E              0.03      0                   0.01

       Pkb = 14-PKa

               = 14-9.26   = 4.74

     POH   = PKb + log[NH4Cl]/[NH3]

              = 4.74 + log0.01/0.03

              = 4.74-0.4771

               = 4.2629
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