【Daily Question】October 5, 2016 – Participation +2 Wealth； +3 to 8 wealth for correct answers
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To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched to foster an active atmosphere for technical exchanges while also providing rewards in the form of financial benefits to users. 【Daily Question】 (Single-choice question) Distilled water should be stored in containers free from ion contamination, such as ( ) containers. A. Polyethylene, plexiglass, quartz containers B. Aluminum sheet C. Iron sheet D. Tinned copper sheet. Correct answer: A. Reply with your answer in the comments; answering correctly earns you +2 wealth points. Getting all answers right grants an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions (or include detailed calculation processes) will receive extra wealth points as a reward. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.
Answer A: Aluminum may undergo hydrolysis to produce aluminum ions; iron and tin can also do so under certain conditions.
Distilled water should be stored in containers that are free from ion contamination, such as (A. polyethylene, plexiglass, quartz containers).
Distilled water should be stored in containers free from ion contamination, such as container (A). A. Polyethylene, plexiglass, quartz containers B. Aluminum sheet C. Iron sheet D. Tinned copper sheet
A. Polyethylene, plexiglass, quartz containers
A. Polyethylene, plexiglass, quartz containers
The answer is A, because aluminum sheets, iron sheets, copper sheets, etc., are prone to oxidation when in contact with air, which causes pollution to water quality. At the same time, new containers for storing distilled water must be soaked in a 20% hydrochloric acid solution for 2–3 days before use; after that, they should be rinsed repeatedly with the distilled water intended for storage. The containers must also be filled with that water and left to soak for more than 6 hours before they can be used.