Buffer Solution |
pH after 1 drop |
pH after 2 drops |
pH after 3 drops |
pH after 4 drops |
ΔpH / drop |
||||||||
Buffer 1 + HCl |
3.2 |
2.9 |
2.6 |
2.4 |
Try 1: ✘ 0.225
|
||||||||
Buffer 2 + HCl |
3.5 |
3.3 |
3.1 |
2.9 |
Try 1: ✔ 0.193
|
||||||||
Buffer 3 + HCl |
4.1 |
3.9 |
3.8 |
3.7 |
Try 1: ✔ 0.118
|
||||||||
Buffer 4 + HCl |
4.6 |
4.5 |
4.5 |
4.4 |
Try 1: ✔ 0.0600
|
||||||||
Buffer 5 + NaOH |
4.6 |
4.7 |
4.8 |
4.8 |
Try 1: ✘ 0.0650
|
||||||||
Buffer 6 + NaOH |
5.2 |
5.3 |
5.4 |
5.5 |
Try 1: ✔ 0.110
|
||||||||
Buffer 7 + NaOH |
6.0 |
7.1 |
10.7 |
11.1 |
Try 1: ✔ 1.36
|
||||||||
Buffer 8 + NaOH |
6.2 |
10.0 |
10.9 |
11.2 |
Try 1: ✔ 1.34
|
Which buffer is the best buffer? and why?
Buffer 4 and buffer 5 are the best buffers. Because in buffer 4 on the addition of HCl, there is only 0.2 pH change for 1 to four drops and the delta pH = 0.0600. In buffer 5, on the addition of a base, there is also 0.2 pH change corresponds to delta pH =0.0400. Both of them are very good buffers, one in acidic and one in basic medium.
Buffer Solution pH after 1 drop pH after 2 drops pH after 3 drops pH after...
1) Find the Difference between measured pH and calculated theoretical pH of solutions 1-6 for [HC2H3O2] (M) and [C2H3O2−] (M) 2) Find the Difference between measured pH and calculated theoretical pH of solutions 1-6. 3) In this experiment, we define the buffer capacity of a buffer as the number of drops of either 3.0 M HCl or 3.0 M NaOH needed before the pH of the solution changes by more than 0.5 pH units. For example, if the pH of...
In this problem you will predict the pH of a buffer solution and then predict the new pH after you add NaOH or HCl. Write your answers to three decimal places (X.XXX). The Ka of HC2H3O2 is 1.8×10−51.8×10−5. 1) Calculate the pH of a buffer made from mixing 11.011.0 mL of 0.080.08 M NaC2H3O2 and 9.29.2 mL of 0.080.08 M HC2H3O2. 2) Calculate the pH of the buffer when 5.25.2 mL of 0.0090.009 M NaOH is added to the buffer...
Na Title: Sample Measured pH of Solution. Additions of 1.OM HCI Initial 3 drops 6 drops 9 drops 12 drops A pH Water 6.43 2.25 2.10 1.98 1.82 Weak Acid: 4.58 3.15 2.85 2.62 241 Weak Base 9.15 9.00 8.878.72 8.64 Buffer: 6.96 6.90 6.78 6.696.55 ApH-Final pH. Initial pH Title: Sample Measured pH of Solution. Additions of 1.0M NaOH 0 drops 3 drops 6 drops 9 drops 12 drops A pH Water 6.49 11.32 11.65 11.79 11.88 Weak Acid:...
\ Part 3: Preparing and testing the carbonic acid/bicarbonate buffer 3) and 6) Buffer 0.1 MHCI A: Buffer A: Buffer B: Butter B: Buffer Part 4: Testing water for pH resistance 2) and 5) DFDFDF A: HO B: H0 Question 6 1 pts pH in Beaker A pH in Beaker B After 5 drops NaOH Solution Initial After 5 drops HCI After 20 drops HCI Initial After 20 drops NaOH Buffer (part 3) Water (part 4) Use the data...
1 . If a buffer solution is 0.260 M in a weak acid (?a=8.3×10−5)and 0.480 M in its conjugate base, what is the pH? pH= 2. If a buffer solution is 0.200 M in a weak base (?b=5.0×10−5) and 0.530 M in its conjugate acid, what is the ph 3. Phosphoric acid is a triprotic acid (?a1=6.9×10−3, ?a2=6.2×10−8 , and ?a3=4.8×10−13 To find the pH of a buffer composed of H2PO4 - (aq) ) and HPO4 2− (aq) , which...
Please answer questions 1-6 Drops of HCI added PH Beaker 1 Acetic Acid + Sodium Acetate pH Beaker 2 Blood Buffer PH Beaker 3 Water O drops 14.83 15.01 9.73 9.00 4.83 4.78 3.00 2.66 8.92 NJ 0 = 8.82 2.44 4:75 4.71 4.66 8 69 2. 29 I 2.18 8.44 4.60 nos 2,10 Drops of NaOH added pH Beaker 1 Acetic Acid + Acetate pH Beaker 2 Blood Buffer pH Beaker 3 Water 0 drops wastlab Questions 1. According...
PART C. Properties of Buffers Buffer system selected_HCO -(0,2- Weak acid name _ NaC,H,O, pH of buffer 4.68 (H') = 2.09 XIOK 2.09x10 pH of diluted buffer 4.13 [H") = 1.8x10K - 1.8x10-5 pH after addition of five drops of NaOH 4.76 pH after addition of five drops of HCI - 4.69 pH of buffer in which (HA) = 0.10 5.66 K.- 2.188x106 pH after addition of excess NaOH 11.53 (2.188x10-6) (0.00) pH of distilled water 8.22 10.09) pH after...
1. Calculate the pH of the acetate buffer, mmol. HA, mmol. A-, and mmol. H3O+ after 4mL, 8mL, 12mL, 16mL, 20mL, 24mL, and 28mL of 0.100M HCl is added to the acetate buffer. 2. Calculate the pH of the acetate buffer, mmol. HA, mmol. A-, and mmol. H3O+ after 4mL, 8mL, 12mL, 16mL, 20mL, 24mL, and 28mL of 0.100M NaOH is added to the acetate buffer. 3. Calculate the pH of the ammonia buffer, mmol. HA, mmol. A-, and mmol....
1. Calculate the pH of the acetate buffer, mmol. HA, mmol. A-, and mmol. H3O+ after 4mL, 8mL, 12mL, 16mL, 20mL, 24mL, and 28mL of 0.100M HCl is added to the acetate buffer. 2. Calculate the pH of the acetate buffer, mmol. HA, mmol. A-, and mmol. H3O+ after 4mL, 8mL, 12mL, 16mL, 20mL, 24mL, and 28mL of 0.100M NaOH is added to the acetate buffer. 3. Calculate the pH of the ammonia buffer, mmol. HA, mmol. A-, and mmol....