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Chapter 23: Q. 23.6 (page 631)

How does a gas-sensing probe differ from other membrane electrodes?

Short Answer

Expert verified

The concentration of dissolved gases in the sample is measured by a gas-sensing probe, while the PH of the solution is measured by a membrane electrode.

Step by step solution

01

Given information

Explain the difference between the gas-sensing probe and the membrane electrode.

02

Explanation

A gas-sensing probe is a sensitive instrument for determining the concentration of dissolved gases in a sample. Adjusting the $P H$ values is used to make the measurements. It is a self-contained cell.

Membrane electrodes are thin glass membranes that are used to test the solution's $P H$ . It's an ion selective electrode of some sort. It calculates the solution's $P H$ . A glass membrane electrode is made up of a glass bulb filled with a fixed concentration of hydrochloric acid.

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Most popular questions from this chapter

What is the operational definition of $p H$ and how is it used?

(a) Calculate the standard potential for the reaction

${Ag}_{3} {AsO}_{4} (s) + 3 e^{-} ⇌ 3 Ag (s) + {AsO}_{4}^{3 -}$

$F o r A g_{3} A s O_{4}, K_{s p} = 1.2 \times 10^{- 22} .$

(b) Give a schematic representation of a cell with a silver indicator electrode and an SCE as reference that could be used for determining localid="1648042702202" ${AsO}_{4}^{3 -}$ .

(c) Derive an equation that relates the measured potential of the cell in (b) to ${pAsO}_{4}$ (assume that the junction potential is zero).

(d) Calculate the $p A s O_{4}$ of a solution that is saturated with ${Ag}_{3} {AsO}_{4}$ and contained in the cell described in (b) if the resulting potential is 0.193 V.

What are the advantages of microfabricated ISEs? Describe typical applications of this type of sensor.

(a) Calculate the standard potential for the reaction $CuBr (s) + e^{-} ⇌ Cu (s) + {Br}_{2}$ , For localid="1646028412805" $CuBr, K_{s p} = 5.2 \times 10^{- 9}$ .

(b) Give a schematic representation of a cell with a copper indicator electrode and a reference SCE that could be used for the determination of localid="1646028426307" ${Br}_{2}$ .

(c) Derive an equation that relates the measured potential of the cell in (b) to $p B r$ (assume that the junction potential is zero).

(d) Calculate the $p B r$ of a bromide-containing solution that is saturated with $C u B r$ and contained in the cell described in (b) if the resulting potential is localid="1645767705806" $- 0.078 V$ .

Calculate the theoretical potential of the following cells. (In each case assume that activities are approximately equal to molar concentrations and that the temperature is 25°C.)

(a) $S C E | | F e^{3 +} (0.0150 M), F e^{2 +} (0.0250 M) | P t$

(b) $S C E | | Z n^{2 +} (0.00135 M) | Z n$

(c) $S a t u r a t e d A g / A g C l r e f e r e n c e | | T i^{3 +} (0.0450 M), T i^{2 +} (0.0250 M) | P t$

(d) $S a t u r a t e d A g / A g C l r e f e r e n c e | | {I_{3}}^{-} (0.00667 M), I^{-} (0.00433 M) | P t$

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