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Brittany Fields СНEM 1111 Name: Section: Score: Experiment 7 Experiment 7 Prelab Assignment 1. A student starts the titration of HCI with NAOH, but he forgot to add the phenolphthalein to the acid solution. When he remembers this omission, he adds the phenolphthalein to the Erlenmeyer flask, and the solution immediately turns pink. Explain why this student will need to start the titration over again. Phenolphthalein is the indicator to determine hou muchof Na 0lt will be fneeded to react with HCl. With the indicator the acid solution will turnpink to demonstrate NGOH reactiag to HCl. The studen t needs to addd the indicator to the acid sulution before Condlucting the titiation, or else the studeat wil/ never lmew the amount of NaCH' has reacted to HCl and his results will be inaccurate. 2. Write the balanced chemical equation for the neutralization reaction that occurs between nitric acid [HNO3] and calcium hydroxide [Ca(OH)2]. HNO3 t CalOH)2 → H,O + Ca(NOg), 12 2HNO3 + Ca(OH), →2H20 + Ca(NO, ), 2H20 + Ca( N03)2 2 HNO, + Ca(0H),→ 2H20+ Ca (NO), 3. 3. A student carries out the titration of H2SO4 with NaOH. She finds that it takes 19.87 mL of 0.2091 M NaOH to reach the endpoing using 15.00 mL of H2SO4. Use this information to calculate the molarity of the H2SO4. Show all work! The balanced equation for this reaction appears below: Н2SO4(aq) + 2 NaOH(аq) > NazSO4(aq) + 2 H20(() 19.87 mL NaOH x 10-38 NaOH 0.2091 mo) NaOH - 0.01987 mol NaOH 0.01987mol Na0H I mol Ho SOn 0.009935 mo l H, SO4 2 mel Na OH 75.00mL H, 50y x 10-3L H, SO4 0.015 2 Hz SO4 ImL Hy S Oy 0.009935 mol Ho SOH 0.0152 Hg S04 0.6623 M Ho SO4 %3D 0.66 M H2 S0 7-6

Brittany Fields СНEM 1111 Name: Section: Score: Experiment 7 Experiment 7 Prelab Assignment 1. A student starts the titration of HCI with NAOH, but he forgot to add the phenolphthalein to the acid solution. When he remembers this omission, he adds the phenolphthalein to the Erlenmeyer flask, and the solution immediately turns pink. Explain why this student will need to start the titration over again. Phenolphthalein is the indicator to determine hou muchof Na 0lt will be fneeded to react with HCl. With the indicator the acid solution will turnpink to demonstrate NGOH reactiag to HCl. The studen t needs to addd the indicator to the acid sulution before Condlucting the titiation, or else the studeat wil/ never lmew the amount of NaCH' has reacted to HCl and his results will be inaccurate. 2. Write the balanced chemical equation for the neutralization reaction that occurs between nitric acid [HNO3] and calcium hydroxide [Ca(OH)2]. HNO3 t CalOH)2 → H,O + Ca(NOg), 12 2HNO3 + Ca(OH), →2H20 + Ca(NO, ), 2H20 + Ca( N03)2 2 HNO, + Ca(0H),→ 2H20+ Ca (NO), 3. 3. A student carries out the titration of H2SO4 with NaOH. She finds that it takes 19.87 mL of 0.2091 M NaOH to reach the endpoing using 15.00 mL of H2SO4. Use this information to calculate the molarity of the H2SO4. Show all work! The balanced equation for this reaction appears below: Н2SO4(aq) + 2 NaOH(аq) > NazSO4(aq) + 2 H20(() 19.87 mL NaOH x 10-38 NaOH 0.2091 mo) NaOH - 0.01987 mol NaOH 0.01987mol Na0H I mol Ho SOn 0.009935 mo l H, SO4 2 mel Na OH 75.00mL H, 50y x 10-3L H, SO4 0.015 2 Hz SO4 ImL Hy S Oy 0.009935 mol Ho SOH 0.0152 Hg S04 0.6623 M Ho SO4 %3D 0.66 M H2 S0 7-6

Fundamentals Of Analytical Chemistry
Fundamentals Of Analytical Chemistry
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ISBN:9781285640686
Author:Skoog
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Chapter5: Errors In Chemical Analyses
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Brittany Fields СНEM 1111 Name: Section: Score: Experiment 7 Experiment 7 Prelab Assignment 1. A student starts the titration of HCI with NAOH, but he forgot to add the phenolphthalein to the acid solution. When he remembers this omission, he adds the phenolphthalein to the Erlenmeyer flask, and the solution immediately turns pink. Explain why this student will need to start the titration over again. Phenolphthalein is the indicator to determine hou muchof Na 0lt will be fneeded to react with HCl. With the indicator the acid solution will turnpink to demonstrate NGOH reactiag to HCl. The studen t needs to addd the indicator to the acid sulution before Condlucting the titiation, or else the studeat wil/ never lmew the amount of NaCH' has reacted to HCl and his results will be inaccurate. 2. Write the balanced chemical equation for the neutralization reaction that occurs between nitric acid [HNO3] and calcium hydroxide [Ca(OH)2]. HNO3 t CalOH)2 → H,O + Ca(NOg), 12 2HNO3 + Ca(OH), →2H20 + Ca(NO, ), 2H20 + Ca( N03)2 2 HNO, + Ca(0H),→ 2H20+ Ca (NO), 3. 3. A student carries out the titration of H2SO4 with NaOH. She finds that it takes 19.87 mL of 0.2091 M NaOH to reach the endpoing using 15.00 mL of H2SO4. Use this information to calculate the molarity of the H2SO4. Show all work! The balanced equation for this reaction appears below: Н2SO4(aq) + 2 NaOH(аq) > NazSO4(aq) + 2 H20(() 19.87 mL NaOH x 10-38 NaOH 0.2091 mo) NaOH - 0.01987 mol NaOH 0.01987mol Na0H I mol Ho SOn 0.009935 mo l H, SO4 2 mel Na OH 75.00mL H, 50y x 10-3L H, SO4 0.015 2 Hz SO4 ImL Hy S Oy 0.009935 mol Ho SOH 0.0152 Hg S04 0.6623 M Ho SO4 %3D 0.66 M H2 S0 7-6
Transcribed Image Text:Brittany Fields СНEM 1111 Name: Section: Score: Experiment 7 Experiment 7 Prelab Assignment 1. A student starts the titration of HCI with NAOH, but he forgot to add the phenolphthalein to the acid solution. When he remembers this omission, he adds the phenolphthalein to the Erlenmeyer flask, and the solution immediately turns pink. Explain why this student will need to start the titration over again. Phenolphthalein is the indicator to determine hou muchof Na 0lt will be fneeded to react with HCl. With the indicator the acid solution will turnpink to demonstrate NGOH reactiag to HCl. The studen t needs to addd the indicator to the acid sulution before Condlucting the titiation, or else the studeat wil/ never lmew the amount of NaCH' has reacted to HCl and his results will be inaccurate. 2. Write the balanced chemical equation for the neutralization reaction that occurs between nitric acid [HNO3] and calcium hydroxide [Ca(OH)2]. HNO3 t CalOH)2 → H,O + Ca(NOg), 12 2HNO3 + Ca(OH), →2H20 + Ca(NO, ), 2H20 + Ca( N03)2 2 HNO, + Ca(0H),→ 2H20+ Ca (NO), 3. 3. A student carries out the titration of H2SO4 with NaOH. She finds that it takes 19.87 mL of 0.2091 M NaOH to reach the endpoing using 15.00 mL of H2SO4. Use this information to calculate the molarity of the H2SO4. Show all work! The balanced equation for this reaction appears below: Н2SO4(aq) + 2 NaOH(аq) > NazSO4(aq) + 2 H20(() 19.87 mL NaOH x 10-38 NaOH 0.2091 mo) NaOH - 0.01987 mol NaOH 0.01987mol Na0H I mol Ho SOn 0.009935 mo l H, SO4 2 mel Na OH 75.00mL H, 50y x 10-3L H, SO4 0.015 2 Hz SO4 ImL Hy S Oy 0.009935 mol Ho SOH 0.0152 Hg S04 0.6623 M Ho SO4 %3D 0.66 M H2 S0 7-6
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