Learning Check Determine the pH of a 0.1M solution of the salt NaF basic due to F- Kb=Kw/Ka UNIVERSITY x² / 0.1 = 2.87e-11 I C F- 0.1M -X + H₂O → OH- + HF (aq) aq. E (0.1-x)≈ 0.1 N/A -X • N/A pOH=? 0 +x X 16.3. Salt solutions are not neutral if the ions are weak acids or bases pH=? 0 +x
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Learning Check Determine the pH of a 0.1M solution of the salt NaF basic due to F- Kb=Kw/Ka UNIVERSITY x² / 0.1 = 2.87e-11 I C F- 0.1M -X + H₂O → OH- + HF (aq) aq. E (0.1-x)≈ 0.1 N/A -X • N/A pOH=? 0 +x X 16.3. Salt solutions are not neutral if the ions are weak acids or bases pH=? 0 +x
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- pH practice a.) determine the pH of a nitric acid solution (HNO3) that has been prepared by mixing 2.0 mL of 1.0 M HNO3 with 98.0 mL of water b.) determine the pH of a 25 mL carbonic acid solution (H2CO3) with a concentration of 5.7 x 10-5 M. assume all the protons will dissociate from the acid and react with water to form hydronium ions. c.) determine the pH and pOH of a NaOH solution that has been prepared by diluting 20.0 mL of 6.0 M NaOH with 80.0 mL of water. d.) determine the pH and pOH of a Ca(OH)2 solution that has been prepared by mixing 0.26 g of Ca(OH)2 pellets in 750 mL of water.Calculation Propanoic acid, a weak acid found in human sweat, has the following aqueous ionization reaction equation." CH3 CH2CO2H(aq)=H+(aq) + CH3CH2CO, (aq) Ka = 1.3 x 10–5 The measured pH for an aqueous propanoic acid solution is 1.78. What is the molar concentration of this solution?Check species H₂S 103 HIO3 NH4 HS H₂O NH3 OH relative pH of 0.1 M aqueous solution 2 5 (Choose one) ▼ (Choose one) ▼ (Choose one) ▼ (Choose one) ▼ 8 (highest) 3
- Question 7 What are the concentrations of all the solute species in 0.150 M lactic acid, HC3H502? What is the pH of the solution? This acid has a Ka = 1.4 x 10-4. For the concentrations, use scientific notation where necessary, using the following notation: for example, an answer of 2.0 x 10-8 is typed as 2.0E-8. pH [HC3H502] M %3D [H+] = M [C3H502] =Untitled document... https://d3nihot30h.. 21. The molar concentration of OH in awater solution is 1.0 x 10-9. The pH of the solution is 9.0 O 5.0 O greater than 9.0 O less than 5.0 O no correct response 22. Calculate the molar concentration of OH in a water solution that has a molar concentration of H* equal to 2.84 x 10 6. O 3.52 x 10-9 O 2.84 x 108 O 5.93 x 10-5 O 1.68 x 10-3 O no correct response 23. 2HCI(ag)+ BaSO4(s) → BaCl2(aq)+ H2SO4(aq) What are the spectator ions in the above reaction? Note: that the compounds that completely dissociate into ions in water are designated with an (aq). O 2H*, SO,2 O Ba2+, 2C1 MacBook AirQUESTION 1 Calculate the pOH of a solution of 0.1905 M CH3CH2NH3F if Kb = 6.400e-4 for CH3CH2NH2? Key Concept: The salt of a weak base is a weak acid. Solution Figure out Ka and then set up the ICE table as usual. ہے
- PROBLEM 1: Calculate the pH of a 0.0125 M HNO3 at 25°C. Complete the ICE Table below: Dissociation Equation HNO3(aq) H+ (aq) INITIAL 0.0125 0 (Analytical molarity) CHANGE (3 pts) EQUILIBRIUM (6 pts) C(HNO3) = [H+] = Calculate [H+] and pH of the solution. Show your complete solution. + NO3(aq) 0 [NO3] =Problem 3A buffer made from which one of the acids below would be the best for a pH of 4.642?a) H2CO3 , Ka = 4.30e-7b) H2S, Ka = 9.10e-8c) CH3COOH , Ka = 1.75e-5d) H3PO4 , Ka = 7.52e-3EXERCISE II -11 1. A chemist,, Hishes to prepare 100.0 mL of a buffer of pH 10.0000 using the base methyl amine, CH,NH2, ánd its salt, CH;NH2, and its salt, CH3NH;CI. (a) What should be the ratio of base to salt to obtain a pH of 10.00? (b) If he makes the solution 0.05000 M CH3NH2, how many moles of methyl ammonium chloride should he add to get the desired pH ? Kp = 5.00 x 104 2. A buffer solution is prepared by dissolving 4.7 g of nitrous acid, HNO2 , and 13.8 g of sodium nitrite, NaNO2, in 1.0 liter of solution. (a) Calculate the pH of the buffer. (b) Calculate the pH of the solution which results when the following are added to separate 100 mL portions of the buffer: (i) 5.0 mmol of HCI; (ii) 5.0 mmol of NaOH. Ka = 4.5 x 104 %3D 3. What change in pH will occur when 0.050 mmol of HOAC (Ka= 1.78 x 10) is added to 100.0 mL of a buffer solution that is 0.1000 M HOAC and 0.1000 M NAOAC? Assume no change in volume.
- Correct Answer You Answered What is the pH of a solution formed when 100 mL of 0.024 M HBr is added to 100 mL of 0.020 M HCNO to form a 200 mL solution? K₂(HCNO) = 3.5 × 10-4 2.52 4.96 2.22 1.92 1.64 1.90Question 24 A solution for which [H*1 = 1.0 x 10-5 will have a pH of %3D O 5.00 O3.00 O -5.00 O -9.00 Question 25Exercise 6b. Arrange the solutions in order of increasing acidity: NaCl, NH4CI, KCN, NaOH, NaCH3COO, NaC3H5O3, Nicotine, C2H5NH3Cl HA and HB are both weak acids in water, and HA is a stronger acid than HB. Which of the following statements is correct? A) A is a stronger base than B, which is a stronger base than H₂O, which is a stronger base than Cl-. B) B is a stronger base than A, which is a stronger base than H₂O, which is a stronger base than Cl-. C) B is a stronger base than A, which is a stronger base than Cl, which is a stronger base than H₂O. D) CI is a stronger base than A, which is a stronger base than B, which is a stronger base than H₂O. E) None of these (A-D) is correct.