2.

To prepare a buffer solution with pH = 2.6, using one of the following weak acids:

HA (Ka=2.710³), HB (Ka=4.410⁶), HC (Ka=2.610⁹) 0r HD (Ka=2.510¹²).

Which acid should be chosen?

1. HD

2. HC

3. HB

4. HA

3.The ions responsible for the electrical conductance through the glass lattice in the glass electrode are:

1. Hydrated layer

2. Outer reference electrode

3. Monovalent cations inside the lattice

4. Buffer solution inside the glass membrane

4.

Consider the titration of 50 mL of 0.1 M KCl with 0.1 M AgNO₃. The pAg of the solution when 0.0 mL AgNO₃ has been added will be..............

1. 2.07

2. 7.00

3. 5.00

4. Indeterminate

5. 10.0