Asked by Paul
A student titrates 0.100M KOH into 50.00 ml of weak acid HX. The pH of the solution is 4.25 after 20.00 ml of the base has been added, and equivalence point is reached when 40.00 ml of the base is added.
1. What is the concentration of the acid, HX ?
2. What is the Ka value of acid HX?
1. What is the concentration of the acid, HX ?
2. What is the Ka value of acid HX?
Answers
Answered by
DrBob222
HX + NaOH ==> NaX + H2O
1. mL x M = mL x M
2. 20 mL is at the half-way point to the equivalence point and pH = pKa; therefore, pKa = 4.25.
1. mL x M = mL x M
2. 20 mL is at the half-way point to the equivalence point and pH = pKa; therefore, pKa = 4.25.
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