Looking for calculations and post lab. Ka of acetic acid is 1x10^-5. Use Henders

Question

Looking for calculations and post lab. Ka of acetic acid is 1x10^-5. Use Henderson Hasselback. Name Data Tables Part 1. pH of Acetic Acid-Sodium Acetate Buffer pH ml of 0.2 M HCI added of 0.2 M H added cale actual 19 1.0 1.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 3.0 4.0 5.0 70 132 7.0 8.0 9.0 10.0 Part 2. pH of Ammonia-Ammonium Chloride Buffer PH mL of 0.2 M NaOH added mil. of0.2 M , HCI added actual cale actual calc. 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 30 296 4.0 5.0 R.46 7.0 8.0 9.0 pemission is gramed only to science eachen whe

Explanation / Answer

1. pH of HCl added to 50m water can be calculated below method

V1 x M1 = V2 x M2

1 x 0.2 = 50 x M2

M2 = 0.004M

Therefore pH = -log [0.004]

                  = 2.397

When HCl is added to water dilution increases means number of H ions per mole decreases, hence pH increases

but A buffer solution resist the change of pH and very little change in pH will takes place.

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