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18 Nov 2019
Explain how each of the following errors would have altered your results. Clearly explain why your calculations would be high. low. or unchanged. (A single word answer is not acceptable.) a. The pH buffers used to calibrate the pH meter were each 0.5 pH units low (3.5 and 6.5 rather than 4.0 and 7.0 respectively). b. You decided to take the pH alter each addition of 5.0 mL of NaOH rather than after every 0.5 mL during the neutralization of your acid sample. c. While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution. d. You refilled your buret between titrations of your unknown acid. Instead of using 0.1 M NaOH as you did for the first titration, you used 0.2 M NaOH. You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 5.62. You determine that the concentration of the unknown acid was 0.1224 M. You also determined that the acid was monoprotic (HA). What is the K_t and pK_a of your unknown acid?
Explain how each of the following errors would have altered your results. Clearly explain why your calculations would be high. low. or unchanged. (A single word answer is not acceptable.) a. The pH buffers used to calibrate the pH meter were each 0.5 pH units low (3.5 and 6.5 rather than 4.0 and 7.0 respectively). b. You decided to take the pH alter each addition of 5.0 mL of NaOH rather than after every 0.5 mL during the neutralization of your acid sample. c. While using the Half Volume method, your solution was dark pink (you overshot the endpoint) and you added the unreacted acid to this solution. d. You refilled your buret between titrations of your unknown acid. Instead of using 0.1 M NaOH as you did for the first titration, you used 0.2 M NaOH. You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 5.62. You determine that the concentration of the unknown acid was 0.1224 M. You also determined that the acid was monoprotic (HA). What is the K_t and pK_a of your unknown acid?
Nestor RutherfordLv2
22 Jul 2019