
Question 9 (2 points) A basic buffer is prepared by adding 0.4565 g of NH4Cl to...
Question 13 (2 points) A basic buffer is prepared by adding 0.7185 g of NH4Cl to 1.00 L of 0.4490 M NH3. Kb (NH3) = 1.8 x 10-5. Calculate the pH of the buffer. Provide your answer to two places after the decimal. Your Answer: Answer Hide hint for Qugstion 13 You must convert the mass of ammonium chloride into molarity. Also, you need to calculate the K, of ammonium ion from the Kb value of ammonia.
Question 15 (2 points) A basic buffer is prepared by adding 0.4870 g of NH4Cl to 1.00 L of 0.2799 M. NH3. Kb (NH3) = 1.8 x 10-5. Calculate the pH of the buffer. Provide your answer to two places after the decimal. Your Answer: Answer Hide hint for Question 15 You must convert the mass of ammonium chloride into molarity. Also, you need to calculate the K, of ammonium ion from the Ky value of ammonia.
Calculate the pH of a buffer prepared by dissolving 0.10 mol of NH4Cl in 1.00 L of 0.15 M NH3. Kb = 1.8 x 10 % for NH3. O a. 11.34 O b. 2.72 O ü O ö Oe. 4.56
What is the pH of the best buffer that can be prepared from NH3 and NH4Cl? Kb = 1.8 x 10-5 for NH3. please show your work
Question 8 (2 points) A 1.00-L of a buffer contains 0.076 M CH3COOH(aq) and 0.214 M CH3COONa(aq); Kalacetic acid) - 1.8 x 10-5. Calculate the pH after the addition of 0.003 moles HCI. Provide your answer to two places after the decimal.
Calculate the pH of a solution prepared by adding 20.0 mL of 0.100 M HCl to 80.0 mL of a buffer that is comprised of 0.25 M NH3 and 0.25 M NH4Cl. Kb of NH3 = 1.8 x 10-5. ОА. 9.17 ОВ. 4.83 0 o С. 9.34 OD.9.26 OE. 4.66
Question 6 (2 points) A 1.00-L of a buffer contains 0.316 M CH3COOH(aq) and 0.315 M CH3COONa(aq); K (acetic acid) = 1.8 x 10-5. Calculate the pH after the addition of 0.009 moles HCI. Provide your answer to two places after the decimal. Your Answer: Answer
Question 11 (2 points) A buffer solution was prepared by mixing 524 mL of 0.161 M NaOCl and 132 mL of 0.381 M HOCI. Calculate the pH of the buffer given that K (HOCI) is 3.2 x 10-8. Provide your answer to two places after the decimal. Your Answer: Answer
Calculate the pH of a 0.20M NH3 / 0.20M M NH4Cl buffer after the addition of 15.0 mL of 0.10 M HCl to 65.0 mL of the buffer. (Kb = 1.8 x 10-5)
Question 10 (2 points) A buffer solution was prepared by mixing 481 mL of 0.441 M NaOCI and 104 mL of 0.491 M HOCI. Calculate the pH of the buffer given that Ka (HOCI) is 3.2 x 10-8. Provide your answer to two places after the decimal.