PH of a buffer solution: Mass of NaC2H3O2 * 3H2O (FW=136g/mol): 3.540g Calculate the Theoretical ...
pH of a buffer solution: Mass of NaC2H3O2 * 3H2O (FW=136g/mol): 3.540g
Calculate the Theoretical pH of these buffer solutions:
A. pH of original buffer solution (with 8.8 mL of 3.0 M acetic acid and 55.6 mL of water) : 4.7
B. pH of buffer + 1.0 mL of 6.0 M HCl: 3.8
C. pH of buffer + 1.0 mL of 6.0 M NaOH: 4.9
Homework Answers
3.540 g NaC2H3O2 * 3H2O (salt) = mass / molar mass = 3.540 g / 136 g / mole = 0.026 mole.
8.8 mL of 3.0 M acetic acid = 0.0088 L * 3.0 mole / L = 0.0264 mole.
a) Using Henderson equation,
pH = pKa + log [salt] / [acid]
or
pH = 4.74 + log (0.026 / 0.0264)
or
pH = 4.73
b) 1.0 mL of 6.0 M HCl = 0.001 L * 6.0 mole / L = 0.006 mole.
pH = pKa + log [salt] / [acid]
or
pH = 4.74 + log [(0.026 - 0.006) / (0.0264 + 0.006)]
or
pH = 4.53
c) 1.0 mL of 6.0 M NaOH = 0.001 L * 6.0 mole / L = 0.006 mole.
pH = pKa + log [salt] / [acid]
or
pH = 4.74 + log [(0.026 + 0.006) / (0.0264 - 0.006)]
or
pH = 4.93
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PH of a buffer solution: Mass of NaC2H3O2 * 3H2O (FW=136g/mol): 3.540g Calculate the Theoretical ...
An acetic acid/ sodium acetate buffer solution similar to the one you made in the lab...
An acetic acid/ sodium acetate buffer solution similar to the one you made in the lab was prepared using the following components: 3.46 g of NaC2H3O2∙3H2O (FW. 136 g/mol) 9.0 mL of 3.0 M HC2H3O2 55.0 mL of water If you take half of this solution and add 2 mL of 1.00 M HCl to it, then what is the pH of this new solution?
Please help, I'm so confused!!!! This is due wednesday night!!! i'm gonna fail :(((( pH of...
Please help, I'm so confused!!!! This is due wednesday night!!!
i'm gonna fail :((((
pH of Buffer Solutions Procedure: Acetic Acid-Sodium Acetate Buffer (pKa acetic acid = 4.75) Weigh about 3.5 g of Na2C2H302 3H2O, record the exact mass, and add to a 250 ml beaker. Measure exactly 8.8 mL of 3.0 M acetic acid (use 10 mL grad cylinder) and add to the beaker containing the sodium acetate. • Measure exactly 55.6 mL of distilled water and add to...
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pH and Buffers IV. pH of a Buffer Solution Mass of sodium acetate, CH,COONa, g 4.2009...
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buffer is HC2H3O2/NaC2H3O2 difference in PH: big change when added to buffer. small change when added...
buffer is HC2H3O2/NaC2H3O2
difference in PH: big change when added to buffer. small
change when added to water. why?
why such a bug change when you add an acud or base to water
but not to butfer?
1. a) Describe the difference in observed pH changes upon adding a small amount of strong acid or base to 25.0 mL of water vs to 25.0 mL of your buffer. b) Explain why there was a difference. 6.0M HC,H,O, is corrosive. Prevent...
REPOSTING: observing pH changes in Water and Buffer solutions. the amount added of HCl and NaOH...
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the amount added of HCl and NaOH are both 25mL.
the buffer solution is made of 2grams of NaC2H3O2 and
4 mL of 6M HC2H3O2 in a 50 mL solution (46mL of water). the
solution will contain 2.4x10^-2 mol each of NaC2H3O2 a d
HC2H3O2.
question:
how to answer it (I'm not sure I'm doing it right and
want an expert to double check):
I need help calculating the theoretical and...
Part A. Calculate the pH of a buffer solution that is 0.247 M in HCN and...
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pH of a buffer solution
pH and Buffers IV pH of a Buffer Solution A.2019 Mass of sodium acetate, CH,COONa, g Measured pH Calculated pH buffer solution prepared with dissolved CH,COONa +8.5 mL CH,COOH (aq) 5.54 40 mL buffer + 1.0 mL of 6.0 M HCI (aq) 4/.ces 40 mL buffer + 1.0 mL of 6.0 M NaOH (aq) 5.02 Calculated pH Measured pH 5,54 deionized water 40 mL DI water +1.0 mL of 6.0 M HCI (aq) 1.C03 40...
Please help, I'm so confused!!!! This is due wednesday night!!!
i'm gonna fail :((((
pH of Buffer Solutions Procedure: Acetic Acid-Sodium Acetate Buffer (pKa acetic acid = 4.75) Weigh about 3.5 g of Na2C2H302 3H2O, record the exact mass, and add to a 250 ml beaker. Measure exactly 8.8 mL of 3.0 M acetic acid (use 10 mL grad cylinder) and add to the beaker containing the sodium acetate. • Measure exactly 55.6 mL of distilled water and add to...
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buffer is HC2H3O2/NaC2H3O2
difference in PH: big change when added to buffer. small
change when added to water. why?
why such a bug change when you add an acud or base to water
but not to butfer?
1. a) Describe the difference in observed pH changes upon adding a small amount of strong acid or base to 25.0 mL of water vs to 25.0 mL of your buffer. b) Explain why there was a difference. 6.0M HC,H,O, is corrosive. Prevent...
REPOSTING: observing pH changes in Water and Buffer
solutions.
the amount added of HCl and NaOH are both 25mL.
the buffer solution is made of 2grams of NaC2H3O2 and
4 mL of 6M HC2H3O2 in a 50 mL solution (46mL of water). the
solution will contain 2.4x10^-2 mol each of NaC2H3O2 a d
HC2H3O2.
question:
how to answer it (I'm not sure I'm doing it right and
want an expert to double check):
I need help calculating the theoretical and...
pH of a buffer solution
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