【Daily Question】March 6, 2016: +2 Wealth for participation； +3 to 8 wealth for correct answers
Thread Content
This post was last edited by zjp on 2016-3-7 at 10:28. 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 total alkalinity of water, V1 represents the volume of hydrochloric acid consumed during titration to the endpoint using phenolphthalein as an indicator, while V2 represents the volume of hydrochloric acid used for titration to the endpoint with methyl orange as an indicator. If V1 = 0 and V2 > 0, it indicates that there is （） in the water. A: Only hydroxides B: Both carbonates and hydroxides C: Only carbonates D: Only bicarbonates. Standard answer: D. Reply with your answer in the comments; answering correctly earns +2 wealth points, while getting all answers right adds 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 rewards. 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.
When determining the total alkalinity of water, V1 represents the volume of hydrochloric acid consumed during titration to the endpoint using phenolphthalein as an indicator, while V2 represents the volume of hydrochloric acid used for titration to the endpoint with methyl orange as an indicator. If V1 = 0 and V2 > 0, it indicates that there is (C) in the water. A: Only hydroxides B: Both carbonates and hydroxides C: Only carbonates D: Only bicarbonates
When determining the total alkalinity of water, V1 represents the volume of hydrochloric acid consumed during titration to the endpoint using phenolphthalein as an indicator, while V2 represents the volume of hydrochloric acid consumed during titration to the endpoint using methyl orange as an indicator. If V1=0 and V2>0, it indicates that there is (A) in the water. A: Only hydroxides B: Both carbonates and hydroxides C: Only carbonates D: Only bicarbonates
When determining the total alkalinity of water, V1 represents the volume of hydrochloric acid consumed during titration to the endpoint using phenolphthalein as an indicator, while V2 represents the volume of hydrochloric acid used for titration to the endpoint with methyl orange as an indicator. If V1=0 and V2>0, it indicates that there is (c) in the water. C contains only carbonates