Question

100 mL water sample requires 4 mL 0.02 N H2SO4

for neutralization upto phenolphthalein end point.

Another 16 mL of the same acid was needed for

further titration to methyl orange end point.

Determine the type & and amount of alkalinities.​

Answer 1

Answer:

Phenolphthalein alkalinity is measured by titration of the sample to an end point pH of 8.3 which corresponds to the end point of the phenolphthalein indicator. Total alkalinity is measured by titration of the sample to an endpoint pH of 4.5 corresponding to the end point of the bromcresol green-methyl red indicator.

Answer 2

Answer:

Answer is given in the image.