assuming that the boric acid, h3po3 present at the end of the borax tritation has a...
Homework Answers
Boric acid is H3BO3 and its Ka value (Acid dissociation constant) is 5.8 * 10-10
Boric acid dissociates very weakly and the concentration of H+ ions produced from boric acid is:
[H+] = ( Ka * [H3BO3])1/2 = ( 5.8 * 10-10 * 0.1)1/2 M = 7.62 * 10-6 M
pH = - log[H+] = - log(7.62 * 10-6 ) = 5.12
The best indicator at this pH is bromocresol green.
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assuming that the boric acid, h3po3 present at the end of the
borax tritation has a...
A thorough explanation would sure be appreciated!!!! Thank you!! Acid-Base Chemistry: Unknown Acid Analysis (in two...
A thorough explanation would sure be appreciated!!!!
Thank you!!
Acid-Base Chemistry: Unknown Acid Analysis (in two experiments) Introduction In this experiment you will titrate a monoprotic weak acid with a strong ak acid with a strong base in the nd using a pH meter (Exp 2). An analysis of concentration and molar mass of the the titration data will allow you to determine the concentration and more unknown acid (Exp 1) and the ionization constant Ka (Exp 2). At the...
Hello. I was trying to do the question but i think my direction is wrong. Can you help me to solve it please. a) T...
Hello. I was trying to do the question but i think my direction is
wrong. Can you help me to solve it please.
a) Titration of Borax Pipette accurately 10.0 cm of the mixed solution into a 200 or 250 cm conical flask and then add a few drops of methyl red (colour change for this indicator is from red in acid to yellow in basic solution) or screened methyl red indicator. Place this flask on a white, glazed plate...
Question 2 Boric acid has a Ka of 5.8 × 10-10. What is the pKa? Assume...
Question 2 Boric acid has a Ka of 5.8 × 10-10. What is the pKa? Assume boric acid is H3BO3 and is monoprotic. Question 3 A 0.25 M solution of boric acid is mixed with a 0.75 M solution of NaOH. What is the pH of the solution if 7.5 mL of boric acid is mixed with 5 mL of NaOH? Question 4 What volume of boric acid solution (in mL) is required to fully neutralize the sodium hydroxide solution?
Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an important compound in industry and agriculture....
Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an
important compound in industry and agriculture.
???1
???2
1.30
6.70
Calculate the pH for each of the points in the titration of 50.0
mL of 2.4 M H3PO3(aq) with 2.4 M KOH(aq).
before addition of any KOH:
after addition of 25.0 mL KOH:
after addition of 50.0 mL KOH:
after addition of 75.0 mL KOH:
after addition of 100.0 mL KOH:
OSA —I но—
1. The pKa of boric acid is 9.24. What is the value of the dissociation constant?...
1. The pKa of boric acid is 9.24. What is the value of the dissociation constant? 2. What molarity of botanic acid (pKa = 4.82) would have a pH of 3.0? 3. A 0.08 M solution of an acid is 0.04% ionized. What is the pKa? 4. Butyric acid has a pKa of 4.82. a) what is the pH of 0.20 Butyric acid? b) what is the value of pKb for this compound? c) using the pKb from part b)...
Boric acid (H3BO3), Ka = 5.4 × 10−10, is frequently used as an eyewash. (a) Use...
Boric acid (H3BO3), Ka = 5.4 × 10−10, is frequently used as an eyewash. (a) Use Lewis structures to illustrate the equilibrium reaction of Ka. (b) Calculate the pH of 0.27 M boric acid solution. pH =
Boric acid has a pH of 5. What does that mean? 1 out of every 10,...
Boric acid has a pH of 5. What does that mean? 1 out of every 10, 00 molecules is an H^+ ion. 1 out of every 100,000 molecules is an H^+ ion. There are 0^-5 moles of H^+ ions per liter of solution. There are 0.698 atoms of hydrogen in boric acid. The pH of lemon juice is 2.2. The pH of orange juice is 4.2. What is the relative differenced in hydrogen ion concentration in the lemon juice as...
Pre-Lab Questions The titration curve below (on the next page) was obtained by titrating 25.00 mL...
i need help with pre-lab questions
Pre-Lab Questions The titration curve below (on the next page) was obtained by titrating 25.00 mL of a boric acid solution with a 1.000 M NaOH solution. Use the information given on the titration curve to answer the following questions: 1. What is the formula and value of K, for boric acid? Calculate using the half equivalence data point, and using the pH at one-quarter and three-quarter points, too. What is the average Ka...
9. Acid-Base Titrations Acid-Base titrations are performed to determine the concentration of an acid or base...
9. Acid-Base Titrations Acid-Base titrations are performed to determine the concentration of an acid or base in a solution When the number of moles of in an acid is equal to the moles of in the base, water is formed and no acid or base is left unreacted. The solution has a pH of 7 and is called neutral. In an acid-base titration we use this concept to find out the concentration of an acid by adding base until all...
It's a weak acid strong base titration Experiment 4: Identification of an unknown acid by titration...
It's a weak acid strong base titration
Experiment 4: Identification of an unknown acid by titration Page 2 of 15 Background In this experiment, you will use both qualitative and quantitative properties to determine an unknown acid's identity and concentration. To do this analysis, you will perform a titration of your unknown acid sample-specifically a potentiometric titration where you use a pH meter and record pH values during the titration, combined with a visual titration using a color indi- cator...
A thorough explanation would sure be appreciated!!!!
Thank you!!
Acid-Base Chemistry: Unknown Acid Analysis (in two experiments) Introduction In this experiment you will titrate a monoprotic weak acid with a strong ak acid with a strong base in the nd using a pH meter (Exp 2). An analysis of concentration and molar mass of the the titration data will allow you to determine the concentration and more unknown acid (Exp 1) and the ionization constant Ka (Exp 2). At the...
Hello. I was trying to do the question but i think my direction is
wrong. Can you help me to solve it please.
a) Titration of Borax Pipette accurately 10.0 cm of the mixed solution into a 200 or 250 cm conical flask and then add a few drops of methyl red (colour change for this indicator is from red in acid to yellow in basic solution) or screened methyl red indicator. Place this flask on a white, glazed plate...
Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an
important compound in industry and agriculture.
???1
???2
1.30
6.70
Calculate the pH for each of the points in the titration of 50.0
mL of 2.4 M H3PO3(aq) with 2.4 M KOH(aq).
before addition of any KOH:
after addition of 25.0 mL KOH:
after addition of 50.0 mL KOH:
after addition of 75.0 mL KOH:
after addition of 100.0 mL KOH:
OSA —I но—
Boric acid has a pH of 5. What does that mean? 1 out of every 10, 00 molecules is an H^+ ion. 1 out of every 100,000 molecules is an H^+ ion. There are 0^-5 moles of H^+ ions per liter of solution. There are 0.698 atoms of hydrogen in boric acid. The pH of lemon juice is 2.2. The pH of orange juice is 4.2. What is the relative differenced in hydrogen ion concentration in the lemon juice as...
i need help with pre-lab questions
Pre-Lab Questions The titration curve below (on the next page) was obtained by titrating 25.00 mL of a boric acid solution with a 1.000 M NaOH solution. Use the information given on the titration curve to answer the following questions: 1. What is the formula and value of K, for boric acid? Calculate using the half equivalence data point, and using the pH at one-quarter and three-quarter points, too. What is the average Ka...
9. Acid-Base Titrations Acid-Base titrations are performed to determine the concentration of an acid or base in a solution When the number of moles of in an acid is equal to the moles of in the base, water is formed and no acid or base is left unreacted. The solution has a pH of 7 and is called neutral. In an acid-base titration we use this concept to find out the concentration of an acid by adding base until all...
It's a weak acid strong base titration
Experiment 4: Identification of an unknown acid by titration Page 2 of 15 Background In this experiment, you will use both qualitative and quantitative properties to determine an unknown acid's identity and concentration. To do this analysis, you will perform a titration of your unknown acid sample-specifically a potentiometric titration where you use a pH meter and record pH values during the titration, combined with a visual titration using a color indi- cator...
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