Homework Answers
![1. HNO3 is a strong acid. So, [H +) = (HNO3] = 0.023m. pH = -log[*] = -log (0.023) = (1.64] -14 2. (H30+) [OH-] = Kw = 1:00x1](http://img.homeworklib.com/questions/23c22780-74bd-11ea-a11a-6d0278b1551c.png?x-oss-process=image/resize,w_560)
![HUID = 0.265 H2O+ + 2107 Initial: __ +x Change: -x Equilibrium: 0.265-x +x x Ka - - 2.9x10 [H30*) (40). 2.9x108 [Hoo] (2) (L)](http://img.homeworklib.com/questions/24644e70-74bd-11ea-8b05-3d4a8e55553e.png?x-oss-process=image/resize,w_560)
![pH = 495 -4.95 - Log (ht] = 4.95 or [4+] = 107 = 12 xiom Initial: HCN - H+ + CN- 0.255 Change : x 1 +2 +2 Equilibrium: 0-255-](http://img.homeworklib.com/questions/2502b290-74bd-11ea-93cc-05305855f0f7.png?x-oss-process=image/resize,w_560)
Add Answer to:
CHM2046L: General Chemistry and Oualitative Analysis II; Fall 2019 Equilibrium: Determination of Acid Ionization Constant (Ka)...
CHM2046L: General Chemistry and Qualitative Analysis II; Fall 2019 Lab # 9: EQUILIBRIUM: Calculating pH and...
CHM2046L: General Chemistry and Qualitative Analysis II; Fall 2019 Lab # 9: EQUILIBRIUM: Calculating pH and Buffer Capacity Post-lab # 9: ( Due Monday, November 7t, 2019) Last name First Name 1. Define buffer capacity. 2. Determine the Kb for CN at 25°C. The Ka for HCN is 4.9 x 10-10, 3. Determine the [H30] in a 0.265 M HCIO solution. The Ka of HCIO is 2.9 x 10-8 rco 4. Determine the pH of a 0.461 M C6H5CO2H M...
please explain the steps please 5. Determine the Ky for CN at 25°C. The K, for...
please explain the steps please
5. Determine the Ky for CN at 25°C. The K, for HCN is 4.9 x 10-10. 6. Determine the Ka of an acid whose 0.294 M solution has a pH of 2.80. 7. Determine the acid dissociation constant for a 0.020 M formic acid solution that has a pH of 2.74. Formic acid is a weak monoprotic acid and the equilibrium equation of interest is HCOOH(aq) + H20(1) =H30+(aq) + HCO2-(aq).
The stinging sensation from red ants comes from formic acid, which dissociates based on the following...
The stinging sensation from red ants comes from formic acid, which dissociates based on the following equilibrium: HCOOH(aq) ⇄ H+(aq) + HCO2-(aq) Ka= 1.8 x 10-4 What is the pH of a 0.50 M solution of formic acid?
Consider the following data on some weak acids and weak bases: acid Ka name formula hydrocyanic...
Consider the following data on some weak acids and weak bases: acid Ka name formula hydrocyanic acid HCN 4.9×10−10 acetic acid HCH3CO2 1.8×10−5 base Kb name formula aniline C6H5NH2 4.3×10−10 hydroxylamine HONH2 1.1×10−8 Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on. solution pH...
(a) HA(aq) is a weak acid with a dissociation constant, Ka, of 1.0 x 10-11. What...
(a) HA(aq) is a weak acid with a dissociation constant, Ka, of 1.0 x 10-11. What is the pH of a solution 0.068 M in A-(aq)? The temperature is 25oC. (b) For the reaction A(g) ⇋ B(g) + C(g), the equilibrium constant is 1.80 at 25.0oC and 4.95 at 75.0oC. Assuming ΔH and ΔS do not change with the temperature, calculate the value of the equilibrium constant at 50.0oC and the value of ΔSuniverse at 50.0oC.
a) b) c) d) If the Kb of a weak acid is 2.9 10*, the K,...
a)
b)
c)
d)
If the Kb of a weak acid is 2.9 10*, the K, of its conjugate acid must be which of the following? 2.9.10 6.46 7.54 3.4 10- The hydronium ion concentration of a 0.50 mol/L solution of hydrocyanic acid, HCN(aq), is 1.4 x 10-5 mol/L. Use Weak Acid Info 16.1 to answer the following question. The Ka for hydrocyanic acid is: 3.9 x 10-10 1.4 x 10-5 5.0 x 10-2 6.2 x 10-10 An acetic acid-sodium...
TABLE 15.5 Acid lonization Constants (K) for Some Monoprotic Weak Acids at 25 °C Acid Formula...
TABLE 15.5 Acid lonization Constants (K) for Some Monoprotic Weak Acids at 25 °C Acid Formula Structural Formula lonization Reaction К. pk, = -log (2) Chlorous acid HCIO H-0-C=0 1.1 x 10-2 1.96 Stronger acids Nitrous acid HNOZ H-O-NO 5.6 x 10-4 HCIO2(aq) + H2011) = H30* (aq) + CO2 (aq) HNO2(aq) + H20(I) = H30+ (aq) + NO2 (aq) HF(aq) + H20(1) = H30* (aq) + F"(aq) 3.25 Hydrofluoric acid HF H-F 6.3 x 10-4 3.20 O Methanoic acid...
17. From the following equilibrium process involving a weak acid (K2), derive the Henderson Hausselbach equation....
17. From the following equilibrium process involving a weak acid (K2), derive the Henderson Hausselbach equation. (show all work) HA(aq) + H2O(lig) + H3O+(ag) + A (ag) 18. If the value of Ka for HCN is 4.9 x 10-10, calculate the equilibrium constant for CN-ag) +H2O(lig) H HCN(aq) + OH(aq) 19. Briefly justify the acidity difference in the following oxyacids: HCIO, HC102, and HC103. 20) What is the pH of a solution made by mixing 100.00 mL of 0.20 M...
Consider the following data on some weak acids and weak bases acid base name formula name formula...
Consider the following data on some weak acids and weak bases acid base name formula name formula hydrocyanic acid HCN 4.9 x 10 10 NH31.8 x 10 ammonia hypochlorous acid HCIO 3.0x 10pyridine CHN 1.7x109 Use this data to rank the following solutions in order of increasing pH. In other words, select a the solution that will have the next lowest pH, and so on next to the solution that will have the lowest pH, a '2' next to solution...
A chemistry graduate student is given 125. mL of a 0.90 M hydrocyanic acid (HCN) solution....
A chemistry graduate student is given 125. mL of a 0.90 M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with Ka = 4.9 10 -10 What mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 9.44? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it. Be sure your answer has a unit symbol, and round it to...
CHM2046L: General Chemistry and Qualitative Analysis II; Fall 2019 Lab # 9: EQUILIBRIUM: Calculating pH and Buffer Capacity Post-lab # 9: ( Due Monday, November 7t, 2019) Last name First Name 1. Define buffer capacity. 2. Determine the Kb for CN at 25°C. The Ka for HCN is 4.9 x 10-10, 3. Determine the [H30] in a 0.265 M HCIO solution. The Ka of HCIO is 2.9 x 10-8 rco 4. Determine the pH of a 0.461 M C6H5CO2H M...
please explain the steps please
5. Determine the Ky for CN at 25°C. The K, for HCN is 4.9 x 10-10. 6. Determine the Ka of an acid whose 0.294 M solution has a pH of 2.80. 7. Determine the acid dissociation constant for a 0.020 M formic acid solution that has a pH of 2.74. Formic acid is a weak monoprotic acid and the equilibrium equation of interest is HCOOH(aq) + H20(1) =H30+(aq) + HCO2-(aq).
a)
b)
c)
d)
If the Kb of a weak acid is 2.9 10*, the K, of its conjugate acid must be which of the following? 2.9.10 6.46 7.54 3.4 10- The hydronium ion concentration of a 0.50 mol/L solution of hydrocyanic acid, HCN(aq), is 1.4 x 10-5 mol/L. Use Weak Acid Info 16.1 to answer the following question. The Ka for hydrocyanic acid is: 3.9 x 10-10 1.4 x 10-5 5.0 x 10-2 6.2 x 10-10 An acetic acid-sodium...
TABLE 15.5 Acid lonization Constants (K) for Some Monoprotic Weak Acids at 25 °C Acid Formula Structural Formula lonization Reaction К. pk, = -log (2) Chlorous acid HCIO H-0-C=0 1.1 x 10-2 1.96 Stronger acids Nitrous acid HNOZ H-O-NO 5.6 x 10-4 HCIO2(aq) + H2011) = H30* (aq) + CO2 (aq) HNO2(aq) + H20(I) = H30+ (aq) + NO2 (aq) HF(aq) + H20(1) = H30* (aq) + F"(aq) 3.25 Hydrofluoric acid HF H-F 6.3 x 10-4 3.20 O Methanoic acid...
17. From the following equilibrium process involving a weak acid (K2), derive the Henderson Hausselbach equation. (show all work) HA(aq) + H2O(lig) + H3O+(ag) + A (ag) 18. If the value of Ka for HCN is 4.9 x 10-10, calculate the equilibrium constant for CN-ag) +H2O(lig) H HCN(aq) + OH(aq) 19. Briefly justify the acidity difference in the following oxyacids: HCIO, HC102, and HC103. 20) What is the pH of a solution made by mixing 100.00 mL of 0.20 M...
Consider the following data on some weak acids and weak bases acid base name formula name formula hydrocyanic acid HCN 4.9 x 10 10 NH31.8 x 10 ammonia hypochlorous acid HCIO 3.0x 10pyridine CHN 1.7x109 Use this data to rank the following solutions in order of increasing pH. In other words, select a the solution that will have the next lowest pH, and so on next to the solution that will have the lowest pH, a '2' next to solution...
A chemistry graduate student is given 125. mL of a 0.90 M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with Ka = 4.9 10 -10 What mass of KCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 9.44? You may assume that the volume of the solution doesn't change when the KCN is dissolved in it. Be sure your answer has a unit symbol, and round it to...
Most questions answered within 3 hours.
-
The blues made its way into many kinds of music. Eric Clapton,
The Beatles, and Elvis...
asked 1 hour ago -
8. A wave in a string has a wave function given by: y (x, t) =...
asked 1 hour ago -
If you’re standing at the bottom of a hill and asked to evaluate
it while being...
asked 2 hours ago -
1. Which region has taken the lead in the world of
e-waste handling?
a) European Union...
asked 2 hours ago -
A 8.15- g bullet from a 9-mm pistol has a velocity of 366.0 m/s.
It strikes...
asked 4 hours ago -
The outstanding bonds of Alpha Extracts have a yield to maturity
of 7.4 percent and a...
asked 4 hours ago -
The Problem: The Case of the Harmonizing Vacations
Your CEO is exploring partnering with a European...
asked 5 hours ago -
A chemical equation is balanced by adding coefficients in front
of some formulas so that the...
asked 5 hours ago -
From the literature (reference your sources): What are the
lattice parameters of calcite and aragonite? Why...
asked 6 hours ago -
Your system is rejecting the question am asking which is
preceded by a case study. It...
asked 6 hours ago -
3. On January 2, 2000, Larry creates a trust with himself as
trustee. Larry as trustee...
asked 6 hours ago -
A member of the volleyball team spikes the ball. During this
process, she changes the velocity...
asked 6 hours ago