pH Measurement and Buffer Q1.Substances pH value at 25°C [H+] (mol dm-3) vinegar 2.8 ? fruit juice 3.4 ? antacids 9.2 ? Q2. Show the calculation the volumes of the two solutions (acetic acid and sodium acetate) should be mixed for the preparation of the acetic buffer with pH 4.2 by the Henderson-Hasselbalch equation. Q3 .Solution : Acetic Buffer NaCl Original pH : 4.2 7.2 pH after adding 5 drops of HCl : 4.2 2.7 pH after adding 5 drops of NaOH : 4.2 11.1 Which sample showed little or no change in pH upon the addition of acid and base? Please write an equation and explain briefly.
pH Measurement and Buffer
Q1.Substances pH value at 25°C [H+] (mol dm-3)
vinegar 2.8 ?
fruit juice 3.4 ?
antacids 9.2 ?
Q2. Show the calculation the volumes of the two solutions (acetic acid and sodium acetate) should be mixed for the preparation of the acetic buffer with pH 4.2 by the Henderson-Hasselbalch equation.
Q3
.Solution : Acetic Buffer NaCl
Original pH : 4.2 7.2
pH after adding 5 drops of HCl : 4.2 2.7
pH after adding 5 drops of NaOH : 4.2 11.1
Which sample showed little or no change in pH upon the addition of acid and base? Please write an equation and explain briefly.
Step by step
Solved in 2 steps
