Hasselbalch equation the ph equals the pk a again the

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Hasselbalch equation, the pH equals the pK a . Again, the pH meter will be used to determine the pH which in this case will also be the pK a. Hypothesis Two: It is expected that the buffer solution will resist a pH change better than saltwater when both acids and bases are added. This will be concluded by preparing a buffer solution of acetic acid and sodium acetate and a saltwater solution. The pH will be tested, then HCl and NaOH will be added to different samples of each solution and the pH will be tested again. Variables Independent – acids or bases in solution Dependent – pH Experimental Procedures: 1) Make 150 mL of 0.1 M NaOH by diluting 5 M NaOH. 2) Add between 0.180 g and 0.220 g of solid KHP to a clean and dry tared 125 mL Erlenmeyer flask and record the value. 3) Add approximately 15-25 mL of water to the flask and swirl until all solid is dissolved. 4) Add the indicator to the solution. 5) Add the NaOH solution to the burette. 6) Carefully add NaOH to the KHP solution until it changes colour and record the volume of NaOH used. Do this three times.

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