A student peforms a titration, titrating 25.00 mL of a weak monoprotic acid, HA, with a 1.26 M solution of NaOH. They collect data, plot a titration curve and determine the values given in the below table. ml NaOH added pH Half-way Point 17.99 3.90 Equivalence point 35.98 8.76 How many moles of NaOH have been added at the equivalence point? _____ mol What is the total volume of the solution at the equivalence point? _____ mL During the titration the following reaction occurs HA + NaOH ⇒ NaA + H2O What is the concentration of A- (the conjugate base of the weak acid) at the equivalence point? _____ M Use [A-] and the pH at the equivalence point to estimate Ka of the weak acid (this is the hard way of estimating Ka) Use the pH at the half-way point to estimate Ka of the weak acid (this is the easier way)
A student peforms a titration, titrating 25.00 mL of a weak monoprotic acid, HA, with a 1.26 M solution of NaOH. They collect data, plot a titration curve and determine the values given in the below table.
ml NaOH added | pH | |
---|---|---|
Half-way Point | 17.99 | 3.90 |
Equivalence point | 35.98 | 8.76 |
How many moles of NaOH have been added at the equivalence point?
_____ mol
What is the total volume of the solution at the equivalence point?
_____ mL
During the titration the following reaction occurs
HA + NaOH ⇒ NaA + H2O
What is the concentration of A- (the conjugate base of the weak acid) at the equivalence point?
_____ M
Use [A-] and the pH at the equivalence point to estimate Ka of the weak acid (this is the hard way of estimating Ka)
Use the pH at the half-way point to estimate Ka of the weak acid (this is the easier way)
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