Consider these three titrations: (i) the titration of 25.0 mL of a 0.100 M monop
ID: 528005 • Letter: C
Question
Consider these three titrations: (i) the titration of 25.0 mL of a 0.100 M monoprotic weak acid with 0.100 M NaOH (ii) the titration of 25.0 mL of a 0.100 M diprotic weak acid with 0.100 M NaOH iii) the titration of 25.0 mL of a 0.100 M strong acid with 0.100 M NaOH Which of the following statements is true? All three titrations have the same pH at their first equivalence point. All three titrations require the same volume of NaOH to reach their first equivalence point. All three titrations have the same the initial pH. A solution has a pOH of 6.02. Is the solution acidic, basic, or neutral? acidic neutral What is Delta H_sys (in kJ) if the entropy change of the surroundings is measured to be +150 J/K at a temperature of 350 K? (Enter only the numerical value for your answer)Explanation / Answer
Q19
a) is false, pH changes for all, specially for the monoprotic which converts in basic solution
b)
True, the stoichiometric ratio for the first proton is the same for HA, H2A, and H3A
c)
false, the triprotic acid is likely to have a lower pH, due to more H+
Q20
if pOH = 6.02, then pH = 14-6.02 = 7.98
which means this is basic