Why you should not start a titration with zero mL as an initial volume?

A 22.47 mL sample of dilute HBr requires 31.92 mL of 0.117 M KOH for neutralization.  Determine the molar concentration of HBr in the sample

2. Why is it necessary to rinse the burette with a few mililitres of the sodium hydroxide solution used in the titration before filling it with this solution? It is necessary to rinse the burette with a few militres of the sodium hydroxide solution used in the titration before filling it with this solution becuase any tiny amounts of liquid remaining are the same as the solution used to fill the burette, so they will not change the concentration of the solution in any way. Moreover this process helps to prevent contamination from the remaining traces of water. 4. When using phenolpthalein indicator in a titration, why is it necessary to have the sodium hydroxide solution in the burette, rather than in the Erlenmeyer flask? When using phenolpthalein indicator in a titration, It is necessary to have the sodium hydroxide solution in the burette, rather than in the erlenmeyer flask becuase it is easy to observe the color change from colorless to pink. On the other hand, if HCI is taken in…

Suppose in a titration of a diprotic acid a student needed 31.84 mL of 0.1105 M NaOH to reach the phenolphthalein endpoint. If the mass of the unknown acid was 0.2706 g, calculate the molar mass of the unknown acid in grams per mole. Type answer: