Question

m is 0.240 mol/dm3 HCl.contains 22.2g of impure Ca(OH)2 per dm3 of solution. put M into the burette and titrate it against 26.3cm3 portion of Q using phenolphthalein as indicator. repeat the exercise to obtain consistent titre value.1. copy and. omplete the table 2. Calculate the average volume of m used.

Answer 1

I don’t have the table or your actual titre readings, so I can’t copy and complete it for you. Please either paste the table or give the recorded burette readings (initial and final) or the titre values for each trial.

How to complete the table and calculate the average volume of m used
- Table columns: Trial | Initial burette reading (cm3) | Final burette reading (cm3) | Titre (cm3 = final − initial).
- Do several titrations (one rough, then at least two or three accurate runs). Discard the rough titration. Select the concordant accurate titres (those within about 0.10 cm3 of each other).
- Average volume = (sum of concordant titre values) / (number of concordant trials).
- Give the average to the same precision as your titres (usually two decimal places for burette readings).

Example
- Suppose your accurate titres were 24.85, 24.90 and 24.95 cm3 (rough titration ignored).
- Average = (24.85 + 24.90 + 24.95) / 3 = 74.70 / 3 = 24.90 cm3.

Send the actual readings or the table and I will fill it in and compute the average for you. If you also want the calculation of moles or purity of the Ca(OH)2 from that average, say so and I’ll do it.