Problems:1. In a titration, a 20 ml sample of 0.3 N HCI is neutralized with 55 ml of NaOH.a) Write the balanced molecular equation for this reaction.b) What is the normality of the base solution?2. In a titration experiment, 20mL of H2SO4 was needed to completely neutralize 30ml of 0.2 N NaOH.Calculate the mass of H2SO4 in 20mL of acid solution?

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1. In a titration, a 20 ml sample of 0.3 N HCI is neutralized with 55 ml of NaOH. a) Write the balanced molecular equation for this reaction. b) What is the normality of the base solution?

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter15: Acid-base Equilibria

Section: Chapter Questions

Problem 3RQ: One of the most challenging parts of solving acidbase problems is writing out the correct equation....

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Using the volume of NaOH and the number of moles needed to react with H2SO4(use your balanced equation; for every 1 mole H2SO4, we need 2 moles NaOH to neutralize) to find the molarity of NaOH and fill in the remainder of the table. The missing parts of the table are labeled A, B, C, D, E, F so you can type your answers for each accordingly. Titration Lab Trial 1 Trial 2 Trial 3 Volume of Acid Used 20.0 mL 20.2 mL 20.8 mL Molarity of Acid Used 0.05 M 0.05 M 0.05 M Initial Buret Reading 0.00 mL 0.00 mL 0.00 mL Final Buret Reading 20.7 mL 21.0 mL 21.5 mL Volume of NaOH Used A В C Molarity of NaOH Solution D E F
EXPERIMENT K Acid-Base Titration: How Much Acid Is In Vinegar? Discussion The label on the bottle of commercial vinegar states that it contains 5.0% acetic acid. According to your calculations, has the manufacture truthfully reported the percent of acetic acid in vinegar? Support your answer with data. 1. 2. A grocery store sells vinegar in 1-L bottles. Based on your answer to question 4 on the previous page. how many moles of acetic acid are in a 1-L bottle of vinegar? a. 60.9 if 10.00 mL of b. how many grams of acetic acid are in a 1-L bottle of vinegar? 6.0 9 3. Would the calculated molarity of acetic acid in vinegar be diluted vinegar had been used in place of the 15.00 mL sample. Explain your answer. a. the same D, higher С. lower 4. If you over-titrate, a significant error will occur in your calculations. Determine how each of the following values would be affected if you over-titrate? Circle the cor- rect response. The volume of NaOH recorded to reach the equivalence point would…
Case Study Section 1 – pH Based on “The Case of the Mortified Mom: Acids, pH and Buffers” by Terry Platt (National Center for Case Study Teaching in Science) The Patient: Paramedics were called to the home of the Mathews family because their 3-year old daughter, Molly, had gotten into the medicine cabinet and consumed a large number of aspirin tablets. When the paramedics arrived Molly had vomited several times, with bits of undissolved tablets visible, but seemed sleepy, almost lethargic. She was rushed to the nearest Emergency Room. When she reached the hospital she was unarousable and was breathing rapidly and deeply. She was examined and lab samples were obtained. Above is the structure of aspirin, or acetylsalicylic acid, which is a weak acid with a pKa of 3.5. The active, and toxic at high doses, form is the protonated form. Under normal conditions this system functions to: Maintain blood pH near physiological pH. Remove excessive H+ generated during…
(t) Sodium hypochlorite, NaOCI, is the active ingredient in household bleach. What is the concentration of hypochloríte ion if 20. requires 28.30 mL of 0.500 M HCI to reach the equivalence point? O 1.21 M QUESTION 3 0.708 M 0.208 M 0.353 M Click Save and Submit to save and submit. Click Save All Answers to save all answers. mL of bleach MacBook Air 02 Save F4 F5 %24 4. DD F7 7. 00
Case Study Section 1 – pH Based on “The Case of the Mortified Mom: Acids, pH and Buffers” by Terry Platt (National Center for Case Study Teaching in Science) The Patient: Paramedics were called to the home of the Mathews family because their 3-year old daughter, Molly, had gotten into the medicine cabinet and consumed a large number of aspirin tablets. When the paramedics arrived Molly had vomited several times, with bits of undissolved tablets visible, but seemed sleepy, almost lethargic. She was rushed to the nearest Emergency Room. When she reached the hospital she was unarousable and was breathing rapidly and deeply. She was examined and lab samples were obtained. Above is the structure of aspirin, or acetylsalicylic acid, which is a weak acid with a pKa of 3.5. The active, and toxic at high doses, form is the protonated form. Question 9: What would be the consequence(s) of lower than normal blood pH? Cause proteins to denature Decrease in enzyme activities Limit…
Case Study Section 1 – pH Based on “The Case of the Mortified Mom: Acids, pH and Buffers” by Terry Platt (National Center for Case Study Teaching in Science) The Patient: Paramedics were called to the home of the Mathews family because their 3-year old daughter, Molly, had gotten into the medicine cabinet and consumed a large number of aspirin tablets. When the paramedics arrived Molly had vomited several times, with bits of undissolved tablets visible, but seemed sleepy, almost lethargic. She was rushed to the nearest Emergency Room. When she reached the hospital she was unarousable and was breathing rapidly and deeply. She was examined and lab samples were obtained. Above is the structure of aspirin, or acetylsalicylic acid, which is a weak acid with a pKa of 3.5. The active, and toxic at high doses, form is the protonated form. Question 1: What percent of the ingested aspirin is in the active form in the stomach (remember that gastric juice has a pH of ~1.5)? 0.01%…
Case Study Section 1 – pH Based on “The Case of the Mortified Mom: Acids, pH and Buffers” by Terry Platt (National Center for Case Study Teaching in Science) The Patient: Paramedics were called to the home of the Mathews family because their 3-year old daughter, Molly, had gotten into the medicine cabinet and consumed a large number of aspirin tablets. When the paramedics arrived Molly had vomited several times, with bits of undissolved tablets visible, but seemed sleepy, almost lethargic. She was rushed to the nearest Emergency Room. When she reached the hospital she was unarousable and was breathing rapidly and deeply. She was examined and lab samples were obtained. Above is the structure of aspirin, or acetylsalicylic acid, which is a weak acid with a pKa of 3.5. The active, and toxic at high doses, form is the protonated form. Question 7: What is the purpose of the activated charcoal? Absorb the residual aspirin to prevent it from entering her bloodstream. Increase…
Case Study Section 1 – pH Based on “The Case of the Mortified Mom: Acids, pH and Buffers” by Terry Platt (National Center for Case Study Teaching in Science) The Patient: Paramedics were called to the home of the Mathews family because their 3-year old daughter, Molly, had gotten into the medicine cabinet and consumed a large number of aspirin tablets. When the paramedics arrived Molly had vomited several times, with bits of undissolved tablets visible, but seemed sleepy, almost lethargic. She was rushed to the nearest Emergency Room. When she reached the hospital she was unarousable and was breathing rapidly and deeply. She was examined and lab samples were obtained. Above is the structure of aspirin, or acetylsalicylic acid, which is a weak acid with a pKa of 3.5. The active, and toxic at high doses, form is the protonated form. What percent of ingested and absorbed aspirin is in the active form in the blood (average pH of 7.4) under normal conditions? 0.00013% 0.13%…
Case Study Section 1 – pH Based on “The Case of the Mortified Mom: Acids, pH and Buffers” by Terry Platt (National Center for Case Study Teaching in Science) The Patient: Paramedics were called to the home of the Mathews family because their 3-year old daughter, Molly, had gotten into the medicine cabinet and consumed a large number of aspirin tablets. When the paramedics arrived Molly had vomited several times, with bits of undissolved tablets visible, but seemed sleepy, almost lethargic. She was rushed to the nearest Emergency Room. When she reached the hospital she was unarousable and was breathing rapidly and deeply. She was examined and lab samples were obtained. Above is the structure of aspirin, or acetylsalicylic acid, which is a weak acid with a pKa of 3.5. The active, and toxic at high doses, form is the protonated form. Question 10: Bicarbonate was an effective buffer in Molly’s situation, what else could/does serve as buffers in the body? Free amino acids…