Question

art 4: The pH of Salts Equation for ion reaction with H20 (if any) pH salt NaCl NH4Cl I 2.75 Pack + H2O P90 Hast HCLG) I 3.06 Phacot Ha Ou Phat cost a laq) 10.80 K COT H2 Ou HR2CO3 OHT 3.33 KPO₃ + H₂O HKPO+CH K2CO3 KNO

Answer 1

1.. when the buffer solution of acetic acid (0.1 M) and sodium acetate (0.1 M) is diluted with water so that its volume becomes double, the pH will not change. Because upon the addition of pure water to buffer, it affects the concentration of acetic acid as well as sodium acetate to the same extent. Hence, there is no change in pH of the buffer solution.

2. pH of the acidic buffer solution is given by pH = pKa + log(conjugate base/acid)

The pH of acidic buffer solutions which is made up of 1 part of NaF and 8 parts of HF is given by

                                             pH = pKa + log(NaF/HF)

                                                   = 3.1 + log(1/8) = 2.19

The pH of acidic buffer solutions which is made up of 1 part of NaF and 8 parts of HF is 2.19