18.11 Calculate the phenolphthalein and total alkalinities of the following samples: (a) A 50-mL sample required 5.3 mL 0.020 N H-SO, to reach the phenolphthalein end point and a total

of 15.2 mL to reach the methyl orange end point. (h) A 100-mL sample required 20.2 mL of 0.020 N H,SO, to reach the phenolphthalein end point and a total of 25.6 mL to reach the methyl orange end point.