the quinhydrone electrode can be used for the potentiometric determination of pH. the solution to be...
the quinhydrone electrode can be used for the potentiometric determination of pH. the solution to be measured is saturated with quinhydrone, an equimolar mixture of quinone and hydroquinone and the potential of the solution is measured with a platinum electrode. the half reaction has an E of 0.699. What is the pH of a solution saturated with quinhydrone if the potential of a platinum electrode in the solution measured against a saturated calomel electrode is -.205V
Homework Answers
The electrode reaction is
C6H4O2 (Quinone) + 2H+ + 2e- → C6H4(OH)2 (hydroquinone)
Quinone is oxidant, and hydroquinone is reductant.
For the potentiometric measurements, it is a combination of the quinhydrone electrode with suitable reference electrode to create electrochemical cell. Thus,
pH = (E0(Q/H2Q) – Ecalomel – E) / 2.303 *R*T/F
E0(Q/H2Q) = 0.699 V
E calomel is a standard table data that was supposed to be given to you in a problem conditions along with the Temperature. I suppose it is room T conditions or that would be stated otherwise. Thus, E calomel at T room = 0.2410 V
E is measured = - 0.205 V
T = Room Temperature = 25 oC
R = Gas Constant = 8.314 J kmol-
F = Faraday constant = 96485 C mol-
Plugging in numbers: pH = (0.699 V - 0.2410 V + 0.205 V) / 0.05916 V = 0.663 / 0.05916 = 11.2
Therefore, the pH of a solution saturated = 11.2
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the quinhydrone electrode can be used for the potentiometric determination of pH. the solution to be...
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A cell composed of a platinum indicator electrode and a silver-silver chloride reference electrode in a solution containing both Fe2* and Fe3+ has a cell potential of 0.699 V. If the silver-silver chloride electrode is replaced with a saturated calomel electrode (SCE), what is the new cell potential? Number 0.675
he quinhydrone electrode was introduced in 1921 as a means of measuring pH. Pt(s) | 1:1...
he quinhydrone electrode was introduced in 1921 as a means of
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hydroquinone(aq), unknown pH || Cl−(aq, 0.47 M) | Hg2Cl2(s) | Hg(l)
| Pt(s) The solution whose pH is to be measured is placed in the
left half-cell, which also contains a 1:1 mol ratio of quinone and
hydroquinone. The half-cell reaction is given below.
A) Select reactions for each half-cell. (Select
all that apply.)
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this is how to question is give.
A cell composed of a platinum indicator electrode and a silver-silver chloride reference electrode in a solution containing both Fe2* and Fe3+ has a cell potential of 0.699 V. If the silver-silver chloride electrode is replaced with a saturated calomel electrode (SCE), what is the new cell potential? Number 0.675
he quinhydrone electrode was introduced in 1921 as a means of
measuring pH. Pt(s) | 1:1 mol ratio of quinone(aq) and
hydroquinone(aq), unknown pH || Cl−(aq, 0.47 M) | Hg2Cl2(s) | Hg(l)
| Pt(s) The solution whose pH is to be measured is placed in the
left half-cell, which also contains a 1:1 mol ratio of quinone and
hydroquinone. The half-cell reaction is given below.
A) Select reactions for each half-cell. (Select
all that apply.)
quinone + 2 H+ +...
Write the half-reaction for the silver-silver chloride reference electrode. Include physical states. half-reaction: - Write the half-reaction for the saturated calomel reference electrode. Include physical states half-reaction: What is the potential of the cell silver-silver chloride electrode || saturated calomel electrode given that the potential for the AglAgCI electrode in a saturated KCl solution is +0.197 V and the potential for a saturated calomel electrode is +0.241 V?
Write the half-reaction for the silver-silver chloride reference electrode. Include physical states....
Write the half-reaction for the silver-silver chloride reference electrode. Include physical states. half-reaction: Write the half-reaction for the saturated calomel reference electrode. Include physical states. half-reaction: What is the potential of the cell silver-silver chloride electrode || saturated calomel electrode given that the potential for the Ag AgCl electrode in a saturated KCl solution is +0.197 V and the potential for a saturated calomel electrode is +0.241 V? E=
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