Topic: pH and Ka Value
Note:
y-intercept = 8.46
Henderson-Hasselbalch equation : pH = pKa + log[A-/HA]
Literature value of pKa = 9.245
Question: Use Henderson-Hasselbalch equation and y-intercept to determine the Ka value for the acid in the conjugate pair (NH3 and NH4Cl). Show your work.
Answer – We are given the Henderson-Hasselbalch equation and graph between the pH vrs log [NH3]/[NH4Cl]
We know the Henderson-Hasselbalch equation-
pH = pKa + log[A-/HA]
From the graph , y-intercept = 8.46
When we draw the graph between the pH vrs log salt/acid then there is straight line equation and the intercept is the pKa values.
So, y-intercept = pKa = 8.46 when graph between the pH vrs log salt/acid.
We know,
pKa = - log Ka
so, Ka = 10-pKa
= 10-8.46
= 3.46*10-9
The actual Ka from pKa = 9.245 is 5.68*10-10, so there is maybe some error in the calculation or recording data.
Topic: pH and Ka Value Note: y-intercept = 8.46 Henderson-Hasselbalch equation : pH = pKa +...
The pH of a buffer is calculated by using the Henderson-Hasselbalch equation: pH=pKa +log[Base]/[Acid] Part A: What is the pH of a buffer prepared by adding 0.809mol of the weak acid HA to 0.406mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66
Henderson-Hasselbalch equation explain the variables and constants. pH=pKa+log[A-]/[HA]
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The Henderson-Hasselbalch equation relates the pH of a buffer solution to the pKa of its conjugate acid and the ratio of the concentrations of the conjugate base and acid. The equation is important in laboratory work that makes use of buffered solutions, in industrial processes where pH needs to be controlled, and in medicine, where understanding the Henderson-Hasselbalch equation is critical for the control of blood pH. Part A As a technician in a large pharmaceutical research firm, you need...
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please show all work 12. Using the Henderson-Hasselbalch equation: [Α] pH = pka + log Calculate what relative amounts of sodium dihydrogen phosphate and sodium monohydrogen phosphate are required to make a buffer solution with pH = 7.9.
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