Lab 7

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Post-Lab Data Summary Note : some questions will display a variable like "nCount" or "SyInput" instead of an actual number in the data summary. Q# Question Text 4) Data Entry - No Scoring Part I. What is your assigned pH value for the ACIDIC buffer solution? Enter your pH value to the hundredth of a pH unit, e.g. 4.70. pH = Your Answer: 4.9 No Points Possible 5) Scoring Scheme: 3-3-2-1 Part I. What volume in mL of 2.5 M sodium acetate is needed to make 250 mL of the acetic acid/acetate ion buffer that has an acetate ion concentration of 0.20 M? You should report your value to 2 significant figures. Volume = Your Answer: 20 You Scored 3 points out of 3 Possible 6) Scoring Scheme: 3-3-2-1 Part I. What is the concentration of the acetic acid in the 250 mL acetic acid/acetate ion buffer solution at your assigned pH? You should report your value to 2 digits. Molarity = Your Answer: 0.14 You Scored 3 points out of 3 Possible 7) Scoring Scheme: 3-3-2-1 Part I. What volume in mL of the 6 M acetic acid solution is needed to prepare the 250 mL acetic acid/acetate ion buffer solution at your assigned pH? You should report your value to 3 digits. Volume = Your Answer: 5.77 You Scored 3 points out of 3 Possible 8) Data Entry - No Scoring Part I. What is the assigned pH value for your NEUTRAL buffer solution? Enter your pH value to the hundredth of a pH unit, e.g. 7.40. pH = Your Answer: 7.1 No Points Possible 9) Scoring Scheme: 3-3-2-1
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Part I. What volume in mL of the 2.5 M stock sodium dihydrogen phosphate is needed to prepare 250 mL of the neutral buffer that was 0.10 M in sodium dihydrogen phosphate? You should report your value to 2 significant figures. Volume = Your Answer: 10 You Scored 3 points out of 3 Possible 10) Scoring Scheme: 3-3-2-1 Part I. What is the concentration of the sodium hydrogen phosphate in the dihydrogen phosphate ion/hydrogen phosphate ion buffer solution at your assigned pH? You should report your value to 2 significant figures. Molarity = Your Answer: 0.079 You Scored 3 points out of 3 Possible 11) Scoring Scheme: 3-3-2-1 Part I. What mass in grams of sodium hydrogen phosphate heptahydrate is needed to make the 250 mL dihydrogen phosphate ion/hydrogen phosphate ion buffer at your pH? You should report your value to 2 significant figures. Mass (g) = Your Answer: 5.3 You Scored 3 points out of 3 Possible 12) Data Entry - No Scoring Part I. What is the assigned pH value for your BASIC buffer solution? Enter your pH value to the hundredth of a pH unit, e.g. 10.70.
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