222) 10 mL of 0.2M acid is added to 250 mL of a buffer solution with pH = 6.34. The pH of the solution becomes 6.32. The buffer capacity of the solution is:

223) Heat of neutralisation when 200 mL of 0.1M HCl is mixed with 300 mL of 0.2M NaOH will be:

224) To 100 mL of 2M aniline, 100 mL of 2M HCl solution is added. pH of the final solution at 25^oC is:

225) If 50 mL of 0.2M NaCN is mixed with 50 mL of 0.2M HCl then:

226) What will be the value of K_w at 90^oC, if [H⁺] in pure water is 10⁻⁶ gram ion⁄L?