Acid Base Buffers - Post—L ab Data Summary-1E Iii-LE ul...

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Unformatted text preview: Post—L ab Data Summary :-1E Iii-LE ul- amt” - it" of an actual “trait-nit in the -: ’ Q# Question Text 4) Data Entry - No Scoring Partl What is your assigned pH value forthe ACIDIC buffer solution? Enteryour pH value to the hundredth of a pH unit, e.g. 4.?0. U | Ii 5) Scoring Scheme: 33-2-1 Partl What volume in mL of 2 5 M sodium acetate is needed to make 250 mL of the acetic acidfacetate ion buffer that has an acetate ion concentration of 0 20 M? You should report your value to 2 significant figures Volume = 6) Scoring Scheme: 33-2-1 Partl What is the concentration of the acetic add in the 250 mL acetic acidfacetate ion buffer solution at your aSSigned pH? You should report yourvalue to 2 digits. Molarity : T) Scoring Scheme: 33-2-1 Partl What volume in mL of the 6 M acetic acid solution is needed to prepare the 250 mL acetic acidfacetate ion buffer solution at your assigned pH? You should report your value to 3 digits. Volume = 8) Data Entry - No Scoring Partl What is the assigned pH value toryour BASIC buffer solution? Enteryour pH value to the hundredth of a pH unit, e g to 70 U | ll 9) Scoring Scheme: 33-2-1 Partl What mass of sodium hydrogen carbonate is needed to make the buffer solution 0.10 M in sodium hydrogen carbonate? You should report yourvalue to 3 significant figures Mass (g) : ’lO) Scoring Scheme: 33-2-1 Partl What is the concentration of the sodium carbonate in the hydrogen carbonate ionlcarbonate ion buffer solution at your asSigned pH? You should report your value to 2 significant figures Molarity = 11) Scoring Scheme: 33-2-1 Partl What mass of anhydrous sodium carbonate is reqUired to make the 250 mL hydrogen carbonate ionlcarbonate ion buffer at your aSSigned pH? You should report your value to 3 significant figures Mass (g) = l2) Scoring Scheme: 33-2-1 Partl Why was your measured pH level of the buffer solutions differenttrom the calculated values? l4) Scoring Scheme: 33-2-1 Part II What volume of the 6 M HCl stock solution is needed to prepare 100 mL of 0.2 M HCl? You should report your value to 2 digits Volume = l5) Scoring Scheme: 33-2-1 Part II What volume of the 6 M NaOH stock solution is needed to prepare 100 mL of 0 2 M NaOH? You should report yourvalue to 2 digits. Volume = 20) Scoring Scheme: 3-2-1-1 Part III Con5idering the ranges of pH of each buffer. which of the following equations best defines the buffer range in terms of pH and pKa? 21) Scoring Scheme: 3-2-1-1 Part III Buffer capacity is defined as the amount of acid or base that can be added to a buffer before any substantial change in pH At what pH is the buffer capacrty at its maxrmum? ...
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