【Daily Question】2.3 Hydrogen Electrode (3 wealth points for a reply + additional 3–8 wealth points for a correct answer)
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This post was last edited by lzy4225925 on 2016-2-5 at 11:02. Topic clarification: A hydrogen electrode refers to the electron-conducting material, rather than the electrode reaction or the entire electrode system. ( ) Wrong. Requirements for answering the question: Answer carefully. Hint: If you don’t understand something, use Baidu. Note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful answer), along with the solution and explanation. Other details: Recruitment for moderators & technicians in the [Mechanical Section] – applications and referrals are welcome. 【Valid indefinitely】【If you’re interested, come ahead!】 】(Click to enter) ★Haichuan’s “Gratitude Season” – a large-scale member sharing event★ (To enter the lucky prize draw, click “I want to register”). 【Mechanical Section】A comprehensive guide to preventing equipment from freezing over during winter. 【Mechanical Section】Call for collection of essential knowledge. 【Seeking manufacturer sponsors】(Ongoing activity). Rewards are available for recommending valuable content; the selection process for “Most Active Users” and “Weekly Stars” in the Mechanical Section has begun. Wealth, metals, corrosion, sections, machinery
Since the potential of a single electrode cannot be determined, it is stipulated that the potential of a hydrogen electrode under standard conditions is zero at any temperature. The potential of any other electrode is then the potential of the cell formed by that electrode and the standard hydrogen electrode; this gives the so-called \"hydrogen-standard\" electrode potential. Standard conditions refer to a state in which the activity of hydrogen ions in the electrolyte of the hydrogen electrode is 1, the pressure of hydrogen gas is 0.1 MPa (approximately 1 atmosphere), and the temperature is 298.15 K. This is an idealized hypothetical state; in practice, a platinum sheet coated with sponge-like platinum black is immersed in an acidic solution with a H+ concentration of 1.0 mol/L, and pure hydrogen gas at a pressure of 100 kPa is continuously introduced at 298.15 K, causing the platinum black to adsorb H2 gas until saturation – thereby making the platinum sheet function like an electrode made of hydrogen. In actual measurements, a reference electrode with a known potential is used in place of the standard hydrogen electrode, such as a calomel electrode or a silver chloride electrode. Their electrode potentials are determined by forming a cell without any liquid junction with the hydrogen electrode, and by making precise measurements followed by extrapolation.
A hydrogen electrode refers to the electron-conducting material, rather than the electrode reaction or the entire electrode system. ( Wrong )
A hydrogen electrode refers to the electron-conducting material, rather than the electrode reaction or the entire electrode system. ( Wrong )