Analysis of an Unknown Chloride
1. A student performed this experiment and obtained the following concentration values: 0.02813 M, 0.02802 M, and 0.02788 M.
a. What is the mean concentration? ____________ M
b. What is the standard deviation of these results? ____________ M
2. A 10.00 mL diluted chloride sample required 13.89 mL of 0.02014 M AgNO3 to reach the Fajans endpoint.
a. How many moles of Clâ ion were present in the sample? (Use Eqs. 2 and 3.) ____________ moles Clâ
b. What was the concentration of chloride in the diluted solution? ____________ M
3. How would the following errors affect the concentration of Clâ obtained in Question 2b? Give your reasoning in each case.
a. The student read the molarity of AgNO3 as 0.02104 M instead of 0.02014 M.
b. The student was past the endpoint of the titration when he took the final buret reading.
Analysis of an Unknown Chloride
1. A student performed this experiment and obtained the following concentration values: 0.02813 M, 0.02802 M, and 0.02788 M.
a. What is the mean concentration? ____________ M
b. What is the standard deviation of these results? ____________ M
2. A 10.00 mL diluted chloride sample required 13.89 mL of 0.02014 M AgNO3 to reach the Fajans endpoint.
a. How many moles of Clâ ion were present in the sample? (Use Eqs. 2 and 3.) ____________ moles Clâ
b. What was the concentration of chloride in the diluted solution? ____________ M
3. How would the following errors affect the concentration of Clâ obtained in Question 2b? Give your reasoning in each case.
a. The student read the molarity of AgNO3 as 0.02104 M instead of 0.02014 M.
b. The student was past the endpoint of the titration when he took the final buret reading.
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