【Daily Question】2016.1.26 Participation +2 Wealth； +3 to 8 wealth for correct answers

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This post was last edited by zjp on 2016-1-27 at 09:00. To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched; this aims to foster active technical exchanges while also providing financial rewards to users. 【Daily Question】 (Single-choice question) When determining the sulfur content in pyrite using the barium sulfate gravimetric method, in order to remove Fe3+ and Cu2+, the sample solution is first passed through ( ) exchange resin before the determination is carried out. A: Strongly basic anion B: Weakly basic anion C: Strongly acidic cation D: Weakly acidic cation. Correct answer: C. Post your answer in the replies; answering correctly earns you +2 wealth points, while getting all answers right grants an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions or answers (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. Note: We will close this post after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation.