A chemistry graduate student is given 450. mL of a 0.50M methylamine (CH,NH,) solution. Methylamine is a weak base with K,=4.4 x 10 -4 What mass of CH, NH, Br should the student dissolve in the CH,NH, solution to turn it into buffer with pH = 10.96? You may assume that the volume of the solution doesn't change when the CH,NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. dlo Explanation Check

Consider the following titration curve of a weak base titrated with a strong acid. How would the pH be calculated at point 1 on the curve? 14 1 12 2. 10 3 4 10 20 30 40 30 60 HCl added (mL) O By subtracting the mol of weak base initially present from the mol of strong acid added to calculate the molarity of strong acid O As a weak acid equilibrium using the K, and the concentration of acid added O As a weak base equilibrium using the Ki and the concentration of base initially present As a buffer using using the K, and the ratio of weak base to conjugate acid Hd

What mass (in g) of sodium formate, HCOONA, must be added to 10.0 L of a 0.483 Maqueous solution of HCOOH to produce a buffer solution with a pH of 3.40? Ka (HCOOH) = 1.9 x 10-4 O 84.5 O 14.2 O 3.82 O 1.88 157

Calculating the pH of a weak acid titrated with a strong base An analytical chemist Is titrating 235.4 mL of a 0.7900M solution of acetic acid (HCH,CO,) with a 1.100M solution of NaOH. The p K, of acetic acid is 4.70. D. Calculate the pH of the acid solution after the chemist has added 131.4 mL of the NaOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of NaOH solution added. Round your answer to 2 decimal places. pH %3D Explanation Check 2021 McGraw-Hill Education. All Rights Reserved Tems of Use Privecy Accessibility A11:48 hp esc back ! @ # $ 8. 1 2 3 r t y W e tab // 11

- 3 A chemistry graduate student is given 100. mL of a 0.30M diethylamine ((C,H,) NH) solution. Diethylamine is a weak base with K,= 1.3 × 10 °. what mass of (C,H5) NH,Br should the student dissolve in the (C,H,), NH solution to turn it into a buffer with pH = 10.94? 2 You may assume that the volume of the solution doesn't change when the (C,H,) NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round 2 it to 2 significant digits.

A chemistry graduate student is given 300. ml of a 0.90M dimethylamine ((CH) NH solution. Dimethylamine is a weak base with K,=5.4 x 10. What mass of (CH,) NH,Br should the student dissolve in the (CH), NH solution to turn it into a buffer with pH - 10.21? You may assume that the volume of the solution doesn't change when the (CH,) NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

A chemistry graduate student is given 100. mL of a 0.40M nitrous acid (HNO,) solution. Nitrous acid is a weak acid with K 4.5 x 10. What mass of -4 NaNO, should the student dissolve in the HNO, solution to turn it into a buffer with pH =3.16? %3D You may assume that the volume of the solution doesn't change when the NaNO, is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. x10 Submit Assignment Continue 2021 McGraw Hill LLC. AlI Rights Reserved. Terms of Use Privacy Center | Accessibility MacBook Air F11 Fig

Determine the mass of solid NaCH₃COO that must be dissolved in an existing 500.0 mL solution of 0.200 M CH₃COOH to form a buffer with a pH equal to 5.00. The value of Ka for CH₃COOH is 1.8 × 10⁻⁵. Let x represent the original concentration of CH3COO- in the water. based on the given values, set up the ICE table in order to determine the unknown

Determine the mass of solid NaCH₃COO that must be dissolved in an existing 500.0 mL solution of 0.200 M CH₃COOH to form a buffer with a pH equal to 5.00. The value of Ka for CH₃COOH is 1.8 × 10⁻⁵. Based on the information provided, set up a RICE/ICE Table to answer the question. Let x represent the original concentration of CH₃COOH in the water.

An aqueous solution contains 0.313 M nitrous acid. How many mL of 0.351 M potassium hydroxide would have to be added to 150 mL of this solution in order to prepare a buffer with a pH of 3.880? mL