az LAB 10 - Acids Bases LECTURE VIDEO 8N: Buffers VIDEO 2: Bicarbonate Buffer System VIDEO 3: Blood Buffer System For th

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Az Lab 10 Acids Bases Lecture Video 8n Buffers Video 2 Bicarbonate Buffer System Video 3 Blood Buffer System For Th 1 (52.93 KiB) Viewed 143 times

Az Lab 10 Acids Bases Lecture Video 8n Buffers Video 2 Bicarbonate Buffer System Video 3 Blood Buffer System For Th 2 (35.26 KiB) Viewed 143 times

Az Lab 10 Acids Bases Lecture Video 8n Buffers Video 2 Bicarbonate Buffer System Video 3 Blood Buffer System For Th 3 (45.04 KiB) Viewed 143 times

az LAB 10 - Acids Bases LECTURE VIDEO 8N: Buffers VIDEO 2: Bicarbonate Buffer System VIDEO 3: Blood Buffer System For the final part of the "in-class" lab, the student is to set up a buffer system. Then small amounts of different acid or base solutions are added to observe their effects on the buffer system. In lieu of that part of the experiment, the links above looks specifically at the blood buffer system. After watching the videos, answer the questions/discussion items below. SEE SLIDE #4 for USEFUL CHARACTERS & SYMBOLS TO CUT & PASTE & MODIFY for your ANSWERS: 1. Write the "bicarbonate buffer system" equilibrium. USE the reaction notation that shows reaction with HO! (12 pt.) CO2 (aq) + H2O = H₂CO₂ (aq) + H2O = H₂ Ot caq) + HCO₃- (aq) 2. Write a chemical equation that shows the effect of ADDING a SMALL AMOUNT of STRONG ACID (e.g., adding H,0") to your bicarbonate buffer system. (HINT: Which of the TWO buffer components will react with added acid?) (10 pt.) 3. Write a chemical equation that shows the effect of ADDING a SMALL AMOUNT of STRONG BASE (i.e., adding OH') to your bicarbonate buffer system. (HINT: Which of the TWO buffer components will react with added base?) (10 pt.)

Addition of OH HO 43. The diagram on the right shows the individual reactions of both acetic acid (CH,COOH) and sodium acetate salt (CH,COO Na') when placed in water. First, re-write the first equation to show the PROPER reversible equilibrium of "acetic acid plus WATER" to represent the Buffer "acetate buffer system" reaction (4 pt.) solution CH,COOH + H. CHC00 CH,COONS No. CH,COo Addition of H CH,COOH USEFUL CHARACTERS & SYMBOLS: 1L 14 4b. Then, write another equilibrium reaction for the addition of the weak base, Ammonia (NH), with the appropriate COMPONENT of the acetate buffer system (6 pt.) (Hint: Ammonia acts as a base, reacting with one of the two major components of the "acetate buffer system" to form two new ions.) x 108M x 108 M part 1 part 2

VIDEO 4: Calculating pH and POH SEE SLIDE #4 for USEFUL CHARACTERS & SYMBOLS to CUT & PASTE & MODIFY for your ANSWERS: LECTURE VIDEO 8G: PH Calculations Complete the following: [H3O+](M) (2 sigfigs) 2.0 x 10°M (OH) (M) (2 sigfigs) рн (2 decimal places) Acidic, Basic, or Neutral? 5. Complete the following table: (12 x 4 pt. each = 48 pt.) NOTE: You may TYPE scientific notations as 3.4e-5 M to represent 3.4 x 10% M. 4.80 3.5 x 102 M IMPORTANT HINT: See Slide #6 for calculation methods for (H') (same as [H,01, (OH), pH, рон. Neutral 6. A solution has a (H') = 0.25 M. Calculate the pOH of this solution, be sure to show work. (See slide #6 for the 2 ways to solve this. Use only one method!) (10 pts.) (SHOW WORKI) (COMMENT: Your poH value should have 2 decimal places due to the odd rules for sigfigs of logarithms!)