7. A student performed an acid-base titration in the lab and recorded the results as shown below.Look very carefully at the results and answer the questions which follow.演定結果Nasco +2HC1 →Naclt Ca t H20試験流定終結演定管讀數(cm)開始演定管讀數(em)所需演定劑的體積 (cm)15.40 27.4015,4012.0034.4027.4012,003612.30(1.51200 1200 tll53.所間滴定劑的平均體積-標0.025/M25 f2010(a) Why do we perform acid-base titrations in our labs?(b) In the titration performed by the student, what was the net ionic equation for the chemical reactionoccurring?(c) List all the wrong things that the student did when writing the report on his titration experiment.(d) What good thing did this student do?

Titration is a method of finding out quantity of an element in a given solution by adding another…

7. A student performed an acid-base titration in the lab and recorded the results as shown below. Look very carefully at the results and answer the questions which follow. 演定結果 HCI→2Nacl+ Co + HO. 演定終結演定管讀數(cm) 開始演定管讀數(cm) 所需演定劑的體積 (cm) BC 5.40 21.40 15.40 1. 2. 36.7 34.40 27.40 12.00 12.30 12.00 (1.5 1200 t1200 tll5 所間演定劑的不均體積。標 0.025/M 25 2010 (a) Why do we perform acid-base titrations in our labs? (b) In the titration performed by the student, what was the net ionic equation for the chemical reaction occurring? (c) List all the wrong things that the student did when writing the report on his titration experiment.

7. A student performed an acid-base titration in the lab and recorded the results as shown below. Look very carefully at the results and answer the questions which follow. 演定結果 HCI→2Nacl+ Co + HO. 演定終結演定管讀數(cm) 開始演定管讀數(cm) 所需演定劑的體積 (cm) BC 5.40 21.40 15.40 1. 2. 36.7 34.40 27.40 12.00 12.30 12.00 (1.5 1200 t1200 tll5 所間演定劑的不均體積。標 0.025/M 25 2010 (a) Why do we perform acid-base titrations in our labs? (b) In the titration performed by the student, what was the net ionic equation for the chemical reaction occurring? (c) List all the wrong things that the student did when writing the report on his titration experiment.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter5: Errors In Chemical Analyses

Section: Chapter Questions

Problem 5.10QAP

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A student performed an acid-base titration in the lab and recorded the results as shown below. Look very carefully at the results and answer the questions which follow. 7. 演定結果 21 3. 346 27.40 00 36 終結摘定管讀數(cm) 開始定管數(Cm 所需演定州的積(cm) 44 標 (a) Why do we perform acid-base titrations in our labs? (b) In the titration performed by the student, what was the net ionic equation for the chemical reaction occurring?
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Mola and Rity were tasked to analyze the acidity of a 10.0-mL fermented milk sample diluted with water in a 250-mL volumetric flask. Mola obtained a 15.0-mL aliquot of this solution, diluted it to 50.0 mL, and then titrated this diluted sample. Titration data were given to Rity and she found out that the 50.0-mL diluted sample contains 0.21 mmol of lactic acid. What is the lactic acid concentration (in M) of the titrated sample?
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Mola and Rity were tasked to analyze the acidity of a 10.0-mL fermented milk sample diluted with water in a 250-mL volumetric flask. Mola obtained a 15.0-mL aliquot of this solution, diluted it to 50.0 mL, and then titrated this diluted sample. Titration data were given to Rity and she found out that the 50.0-mL diluted sample contains 0.21 mmol of lactic acid. MW: Lactic Acid (90.08) a. What is the lactic acid concentration (in M) of the titrated sample? b. Determine the lactic acid content (in M) of the 10.0-mL fermented milk sample. c. What is the lactic acid concentration (in %w/v) of the 10.0-mL fermented milk sample?
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