A buffer solution contains 0.413 M ammonium bromide and 0.267 M ammonia. If 0.0299 moles of potassium hydroxide are added to 150 mL of this buffer, what is the pH of the resulting solution? (Assume that the volume does not change upon adding potassium hydroxide) pH = ________

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 × 10 *. What mass of CH,NH,Br should the student dissolve in the CH,NH, solution to turn it into a buffer with pH = 10.96? 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. olo x10 Ar Explanation Check © 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility .........................................

4. A student titrates 20.0 ml of an acid solution with 0.500 M NaOH and gets the graph shown below. Determine the concentration of the acid. 2 14.0 13.0 12.0 1.0 5.0 3.0 2.0 00 Titration: pH vs. Volume of Strong Base 2.0 SO Volume of Base Added (ml) 8.0 5. From the graph given in the previous question, determine the pKa of the acid used in the titration. Which of the following acids (hypobromous-HBrO, Formic-HCHO2, Hypochlorus-HCIO, or Periodic-HIO4, or Hydroiodic-HI) is the acid used? Explain how you know. 1.0.0 703

A 50.0-ml sample of 0.20 M hydrochloric acid (HCI) is titrated with 0.5 M LIOH. Determine the pH of the solution after the following volumes of LIOH titrant are added. Express your answers to two decimal places. a) pH after 10 mL of LIOH added: b) pH after 20 mL of LIOH added: c) pH after 30 mL of LIOH added: Check

8b.

You could make an acetate buffer by titrating a solution of sodium acetate with ______ to reach the desired pH (HCl or NaOH).

Calculate the expected pH of the buffer.

A chemistry graduate student is given 250. mL of a 1.40M ammonia (NH3) solution. Ammonia is a weak base with K-1.8x10 should the student dissolve in the NH3 solution to turn it into a buffer with pH = 9.17? What mass of NH, Br You may assume that the volume of the solution doesn't change when the NH4Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. ?