ical formula for formic acid is HCO₂H. To make this buffer, let's say we start with 2.53 M sodium formate in 1 L of water (and assume 1L of volume throughout this problem). 1. Using the chemical formula information above, show the chemical reaction of formate with water to form products (hint: what part of the sodium formate reacts with the water?) Make sure you include the phases of matter. 2. What is the value of the equilibrium constant for this reaction?

Introductory Chemistry: An Active Learning Approach
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Chapter16: Solutions
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Problem 100E: Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a...
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6.
7.
8.
For a particular application in my lab, we often need to make a formic acid buffer. The chemical formula for formic acid is HCO₂H.
To make this buffer, let's say we start with 2.53 M sodium formate in 1 L of water (and assume 1L of volume throughout this problem).
5.
2.
3. (
4.
1.
Using the chemical formula information above, show the chemical reaction of formate with water to form products (hint: what
part of the sodium formate reacts with the water?) Make sure you include the phases of matter.
What is the value of the equilibrium constant for this reaction?
What is the pH of the solution right now?
Let's say we add HCl, show the reaction that would occur (what part of the HCI reacts with what part of the equilibrium reaction
outlined in part 1?)
Let's say we add 0.45 moles of HCI. What is the resulting pH now?
Ok, to the solution in #5 above, after we add the HCI, we now add 0.23 mol NaOH. Identify the component in the solution with
which the NaOH will react.
What is the new pH of the solution described in #6?
At which stage in here (Identify a number 1, 4, or 6) does this solution become a buffer and briefly describe why.
Transcribed Image Text:6. 7. 8. For a particular application in my lab, we often need to make a formic acid buffer. The chemical formula for formic acid is HCO₂H. To make this buffer, let's say we start with 2.53 M sodium formate in 1 L of water (and assume 1L of volume throughout this problem). 5. 2. 3. ( 4. 1. Using the chemical formula information above, show the chemical reaction of formate with water to form products (hint: what part of the sodium formate reacts with the water?) Make sure you include the phases of matter. What is the value of the equilibrium constant for this reaction? What is the pH of the solution right now? Let's say we add HCl, show the reaction that would occur (what part of the HCI reacts with what part of the equilibrium reaction outlined in part 1?) Let's say we add 0.45 moles of HCI. What is the resulting pH now? Ok, to the solution in #5 above, after we add the HCI, we now add 0.23 mol NaOH. Identify the component in the solution with which the NaOH will react. What is the new pH of the solution described in #6? At which stage in here (Identify a number 1, 4, or 6) does this solution become a buffer and briefly describe why.
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