When do i use henderson hasselbalch

The basic equation is as follows:. We have straightforward calculations for strong acids and bases, but the computations behind buffers are rather complex and time consuming. By using the fact that weak acids and bases barely ionize, allowing us to approximate the pH of buffer solutions using initial concentrations. Lawrence Joseph Henderson was a talented biochemist, among many other titles, who spent most of his career at Harvard.

He was responsible for developing the components of the equation after studying equilibrium reactions that took place within blood as a result of respiration specializing in "fatigue". His equation was incomplete without the solid calculations into it provided by Hasselbalch. Karl Albert Hasselbalch was a chemist who studied pH closely.

He also studied blood and reactions that took place with oxygen, to put in the simplest of terms. Correct answer:. Explanation : In this question, we're given the concentrations of both a weak acid and its conjugate base in solution. Report an Error. Example Question 2 : Henderson Hasselbalch Equation. Explanation : The Henderson-Hasselbach equation can be used to find the answer. When we plug the given numbers into this equation, we get:.

Example Question 3 : Henderson Hasselbalch Equation. Explanation : To find the answer to this question, we must use the Henderson-Hasselbach equation: refers to the concentration of base in this case, ammonium chloride.

Example Question 4 : Henderson Hasselbalch Equation. Explanation : In this question, we're given two different solutions. Example Question 5 : Henderson Hasselbalch Equation. Possible Answers: 3. Correct answer: 4. Explanation : To answer this question, we can use the Henderson-Hasselbalch equation since we have a buffer system, a weak acid and its conjugate base. Acetic acid is our weak acid and acetate is the conjugate base. Example Question 6 : Henderson Hasselbalch Equation. Possible Answers: Hydrochloric acid, hydrochloric acid.

Correct answer: Acetate,. Explanation : The answer is the acetate ion because at this point, there has not been enough hydrochloric acid added to make a lot of acetic acid. Example Question 7 : Henderson Hasselbalch Equation.

Determine the pH of the following combination of solutions: 8 mL of 0. Possible Answers: 7. Correct answer: 8.

Explanation : The first reaction that has to happen is the creation of , ammonium. We need to determine the total amount of moles of ammonia, and then how many are remaining. Now we can use the Henderson-Hasselbalch equation to solve for the pH. Example Question 8 : Henderson Hasselbalch Equation. Determine the pH of the following combination of solutions: 6 mL of 0.

Possible Answers: 9. Correct answer: 9. Explanation : The relevant chemical reaction here is: First we need to determine how many moles we have of and. Example Question 9 : Henderson Hasselbalch Equation. Determine the pH after combining these two solutions: 10 mL of 0. Possible Answers: 5.

Explanation : The first reaction that will happen is the formation of acetate from the reaction of the strong base with acetic acid: How many moles of OH - are reacting? Doing the same as above: So the amount of acetate, formed is equal to the number of moles of added. And to figure out how much acetic acid is leftover: moles of acetic acid - moles of moles of acetic acid leftover So now that we know how many moles we have of the weak acid and its conjugate base, we can use the Henderson-Hasselbalch equation:.

Example Question 10 : Henderson Hasselbalch Equation. Possible Answers: 0. Correct answer: 0. Explanation : We need to use the Henderson-Hasselbalch equation to determine how many moles of ammonia we need. First we need to determine the number of moles of ammonium we have: When we plug that into the Henderson-Hasselbalch equation: In this case, we have the acid, and we are looking for the base Raise both sides to the 10 Cross multiply moles of ammonia Now we need to determine the volume of 0.

Copyright Notice. View Tutors. Adedayo Certified Tutor. Adam Certified Tutor. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Featured Video. Cite this Article Format. Helmenstine, Anne Marie, Ph. Henderson-Hasselbalch Equation and Example. How to Make a Phosphate Buffer Solution. How to Calculate the pH of a Weak Acid. Henderson Hasselbalch Equation Definition. Polyprotic Acid Example Chemistry Problem. Buffer Definition in Chemistry and Biology.

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