11. show work 8. What is the ionic strength of a solution that is 0,0250 M Na,S0
ID: 562246 • Letter: 1
Question
11. show work
8. What is the ionic strength of a solution that is 0,0250 M Na,S04 and 0.0150 M Phl(NO)? (4 pts) a. 0.0800 M b.0.100 M c. 0.120 M d. 0.0600 M e. None of the above 9. Using the extend Debye Huckel equation, what is the activity coefficient for the SO.,2 ion from the question 9. The effective radius is 0.40 nm. (4 pts) a. 0.351 b. 0.250 c. 0.327 d. 0.0665 e. None of the above 10. At 25°C, K for the following reaction is 0.040 A mixture of N2, Ha, and NHs in a vessel at 25°C has the following concentrations: [N:] 2.0 M, [H] 0.50 M and NH.] 0.10 M. which one of the following statements concerning the reaction quinent . TRUE for the above system? (4 pts) Note: I made changes to this question that mean the answer on the exam is no longer correct so do not just assume the answer is (d) it is not a. Q-K; the system is at equilibrium. b. Q is less than K; more N2 and H: will be produced. c. Q is less than K; more NHs will be produced. d. Q is greater than K; more N2 and H will be produced e Q is greater than K; more NH; will be produced. 11.) In the lab we are trying to analyze a solution which contains a triprotic acid of interest. Our spectroscopic method requires the acid to be in the fully deprotonated form for detection. We can control the primary species by altering pH, what pH would you buffer your solution to in order to ensure all of the sample is in the fully deprotonated form? (4 pts) a. pH = 2.00 b. pH=4.00 c. pH=5.00 d. pH 7.00 4I P ag eExplanation / Answer
if we want fully protoanted sample
then
H3A --> H+ + H2A
should not happen
we must add plenty of H+ to ensure H3A formation
therefore
pKa1 = -log(Ka) = -log(7.0*10^-4) = 3.15
therefore, any pH < pKa1
ensures most 100% protonation
choose p´H = 2
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