30 Apr EXPLAIN WHY EACH SALT APPEARS TO BE NEUTRAL, ACIDIC, OR ALKALINE.
Calculate the Ka or Kb using the formula given in the introduction. Record these in your data table.
Calculate the pKa or pKb (pKa/b =-log Ka/b) and record these in your data table.
Discussion Questions:
Find the Ka/b values in Appendix D tables 1 (Ka1 only) and 2 and calculate the pKa/b values.
Calculate your percentage error.
Explain mathematically and chemically why you cannot measure or calculate a pKa or pKb for a strong acid or strong base.
Part II
Discussion
Salts can be formed by the reaction of an acid with a base. For each of the four salts you tested, write the reaction of an acid with a base to form that salt. Indicate whether the acid and base are strong or weak.
Write the dissociation equations for each of the four salts (into ions- you should use the subscript (aq) for them).
Write the hydrolysis equations for each of the four (4) salts (see intro for examples).
According to your data, indicate which salts appear to be neutral, acidic, and alkaline.
Explain why each salt appears to be neutral, acidic, or alkaline.
List an example other than the salts used in this lab for each of the following:
a neutral salt (formed by the reaction of a strong acid with a strong base)
a neutral salt (formed by the reaction of a weak acid with a weak base)
an acidic salt
an alkaline salt
In the lab, which of the salts could be used to make a buffer and why?
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