Question

The cell SCE || H? (a = x) | glass electrode has a potential of 0.2106 V when the solution in the right-hand compartment is a buffer of pH 4.006. Calculate the pH and the hydrogen ion activity of each unknown, if when the buffer is replaced with unknowns, the following potentials are obtained: a -0.2883 V. pH = Hydrogen ion activity = M b +0.1195 V. pH = Hydrogen ion activity = M c Assuming an uncertainty of 0.002 V in the junction potential, what is the range of hydrogen ion activities within which the true value might be expected to lie? For part (a) M < hydrogen ion activity < M For part (b) M < hydrogen ion activity < M

          The cell
SCE || H? (a = x) | glass electrode
has a potential of 0.2106 V when the solution in the right-hand compartment is a buffer of pH 4.006. Calculate the pH and the hydrogen ion activity of each unknown, if when the buffer is replaced with unknowns, the following potentials are obtained:
a -0.2883 V.
pH =
Hydrogen ion activity = M
b +0.1195 V.
pH =
Hydrogen ion activity = M
c Assuming an uncertainty of 0.002 V in the junction potential, what is the range of hydrogen ion activities within which the true value might be expected to lie?
For part (a)
M < hydrogen ion activity < M
For part (b)
M < hydrogen ion activity < M

The cell
SCE || H? (a = x) | glass electrode
has a potential of 0.2106 V when the solution in the right-hand compartment is a buffer of pH 4.006. Calculate the pH and the hydrogen ion activity of each unknown, if when the buffer is replaced with unknowns, the following potentials are obtained:
a -0.2883 V.
pH =
Hydrogen ion activity = M
b +0.1195 V.
pH =
Hydrogen ion activity = M
c Assuming an uncertainty of 0.002 V in the junction potential, what is the range of hydrogen ion activities within which the true value might be expected to lie?
For part (a)
M < hydrogen ion activity < M
For part (b)
M < hydrogen ion activity < M

Added by Abigail M.

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