【Daily Question】November 11, 2015: Participation +2 Wealth； +3 to 8 wealth for correct answers
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This post was last edited by zjp on 2015-11-14 at 10:03. 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) Volume correction of a burette: At 25°C, 20.01 mL of water was released from the burette, and its mass was found to be 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g. Then the volume correction value for this burette is: ( ) A +0.04 mL B –0.04 mL C +0.08 mL D –0.08 mL Please reply with your answer; participating in the quiz earns you +2 points. Those who get all answers correct will receive an additional +3 to +8 points. Those who provide a thorough analysis or detailed calculation process for the question and answers will receive extra points as well. If your answer is correct and your analysis is accurate, it will be marked as the best reply. 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.
Volume correction of the burette: At 25°C, 20.01 mL of water was discharged from the burette, and its mass was found to be 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g. Therefore, the volume correction value for this burette is: ( C ) A +0.04 mL B –0.04 mL C +0.08 mL D –0.08 mL
Volume correction of the burette: At 25°C, 20.01 mL of water was discharged from the burette, and its mass was 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g; therefore, the volume correction value for this burette is: ( C )
Volume correction of the burette: At 25°C, 20.01 mL of water was discharged from the burette, and its mass was 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g; therefore, the volume correction value for this burette is: ( C )
Volume correction of the burette: At 25°C, 20.01 mL of water was discharged from the burette, and its mass was found to be 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g. Therefore, the volume correction value for this burette is: (C ) A +0.04 mL B –0.04 mL C +0.08 mL D –0.08 mL
Volume correction of the burette: At 25°C, 20.01 mL of water was released from the burette, and its mass was 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g; therefore, the volume correction value for this burette is: (C + 0.08 mL)
Volume correction of the burette: At 25°C, 20.01 mL of water was released from the burette, and its mass was 20.01 g. It is known that the mass of 1 mL of water at 25°C is 0.99617 g. Therefore, the volume correction value for this burette is: ( C ) A +0.04 mL B –0.04 mL C +0.08 mL D –0.08 mL
The correct answer to this question should be C. Correction value = v_actual – v_measured = 20.09 – 20.01 = 0.08 ml.
D, -0.08ml-----------------------------------