Please check these. Based on the protocol for the upcoming laboratory, what woul
ID: 53931 • Letter: P
Question
Please check these. Based on the protocol for the upcoming laboratory, what would overshooting your endpoint (the addition of NaOH to your acid past the equilibrium point) do to the value of your unknown hydrochloric acid? It could change the value of the unknown to where you record the wrong HCl solution. Consider the following scenario For trial #1, 25 ml of an unknown HCl solution was added to an Erlenmeyer flask along with a drop of phenolphthalein. The initial buret reading was at the 2.53 ml mark. At the end of the trial, the very last drop for the titration gave a light but permanent pink color, and the final buret reading was at the 46.28 ml mark. Assuming that the titrant is a 1.0 Molar NaOH solution, what would be the molarity of the Hydrochloric acid solution? What is the molarity of your titrant? What does the lighest shade of pink indicate about your unknown solution? What is the Molarity of your unknown hydrochloric acid solution? According to the diagram above. What is the buret reading?Explanation / Answer
13. Correct
14. Ans
Volume of Hcl = 25 ml (V2)
Molarity of Hcl = ? (M2)
Volume of titratant (NaOH) = 46.28-2.52 ------> 43.5 mL (V1)
Molarity of NaOH = 1.0 M (M1)
M1 V1 = M2 V2
M2 = 1 X 43.75/25 ---------> 1.75 M
a) Molarity of titrant (M1) = 1.0 M
b) Volume of titrant = 43.75 mL
c) Lightest shade of the pink colour indicates end point of titration
d) Molarity of Hcl = 1.75 M
15. Bure reading 27.8 ml