General Chemistry II Southern California University of Health Sciences 2. Fill in the measured pH and the calculated [H'

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General Chemistry Ii Southern California University Of Health Sciences 2 Fill In The Measured Ph And The Calculated H 1 (90.49 KiB) Viewed 7 times

General Chemistry II Southern California University of Health Sciences 2. Fill in the measured pH and the calculated [H'], pOH and [OH] values for each of the experiments designed examine the effects of added acids and bases on buffers. Beaker 1. (buffer + acid) Beaker 2 (buffer + base) Beaker 3 (water + acid) Beaker 4 (water + base) Measured pH 4. 3.93 5.60 Calculated [H] 1.66yp Calculated pOH Calculated [OH] 2151 X²0-214-516= Piy POH = 14 - 3.08 = 10.22 C-03 x 10" 14-3.24 =10.22 7.24x10² 12.53 3.09×10 14-15-51 = 1.49 3. Show your calculation of [H], pOH and [OH] for Beaker 1: H+_ 16x100 10-3.78 57 60316-11 14-114 107 10 TE 113620 10-13 1017 Using 1.8x10 for the K, for acetic acid, along with the weight of sodium acetate and volume of acetic acid used to prepare the buffer, calculate the expected pH of the buffer. Show your work for full credit. How well does it compare to the observed value?
General Chemistry II Southern California University of Health Sciences Calculate the expected pH of buffer plus added HCl. Show your work for full credit. How much did the value decrease when acid was added? 5. 6. Calculate the expected pH of buffer plus added NaOH. Show your work for full credit. How much did the value increase when base was added? 7. Considering the results of the addition of acid or base to a buffered solution and contrasting those to the results when acid or base are added to unbuffered water, briefly discuss the effectiveness of buffers in resisting pH changes. 22
General Chemistry II Name Laboratory Instructor Armen wazarian Date 6/27/20 Report Form: Experiment 4 Acids and Bases - Hydrolysis, Weak Acids and Buffers Southern California University of Health Sciences Lakota Potter Lab Report pH of Salt Solutions 1. What is the approximate pH of unboiled water? PH = 7.57 What is the approximate pH of boiled water? 6.94 2. 3. Fill in the following table with your measured pH, [H] and calculated values for K, or K, (if applicable). 1. Solution Measured pH [H'] Calculated K, or K 0.10 M NaCH,CO₂ 1. Do 125 PKG 1.5 75x16 13 Floust 0.10 MINH,CI 61.47 2.10X10 11.53 2.87 1.314 X10 1.160 x 105 0.10 M Na₂CO₂ 0.10 M HCH,CO₂ 2138x10²4 4 Show an example of your K, or K, calculation for NaCH,CO₂: Buffer Solutions: +1 671x10 •1-X01 151976-7²/10" CT3 (0011 wa What was the observed value of the pH of the acetate buffer solution? 6978 at 410.9°C 14