Students: Annabel Latus and Sura Hassan, blogging our progress on research project at the University Of Hull.
Supervisors: Dr. Theoni Georgiou (Surfactant and Colloid Science), Negar Ghasdian (PhD student)
We prepared a 0.2M solution of NaOH and Milli-Q water to use for titrating our 1% polymer solutions. Unfortunately not all of the polymers were dissolved when we arrived in the lab this morning so we only titrated P1(NG6), P2(NG6), P3(NG6), P4(NG6) and P8(NG6).
- Approximately 2g of NaOH pellets were weighed and put in a volumetric flask.
- The flask was filled up to the mark with Milli-Q water and labelled.
- A microburette was rinsed with Milli-Q water and filled with the 0.2M NaOH solution. The initial volume of the microburette was recorded.
- A vial of one of the fully dissolved 1% polymer solutions was opened and we tested the pH with a pH metre.
- The initial pH of the 1% polymer solution needed to be between 2.0-2.5 . If it wasn’t, 1 or 2 drops of HCl was added to bring the pH down.
- The 0.2M NaOH solution in the microburette was added drop-wise to the 1% polymer solution. After 1-3 drops each time, the pH of the 1% polymer solution was recorded and the volume on the microburette was noted down in a table.
- This was done until the pH of the 1% polymer solution reached over 11.00.
This titration method was repeated with all of the other 1% polymer solutions that had dissolved fully.
Today, after finally getting our COSHH forms signed, we began work in the lab.
Our full day consisted of preparing 1% solutions of various polymers. Each solution had to weigh ~10g which meant that in each vial, 9.9g of Milli-Q water was added to 0.1g of polymer.
- 13 vials were rinsed with acetone and placed in an oven to dry.
- After drying, the vials were left to cool down to room temperature.
- The scales were tared. A magnetic stirrer was placed in a vial, and the mass of both the vial and the stirrer were measured and noted in a table.
- With the vial still on the scales, it was tared again. 0.1g of polymer was added to the vial. The weight was noted down in a table.
- Milli-Q water was added until the scales read approximately 10g.
- The vial containing the solution was then sealed and labelled.
- This was done 13 times (for 13 different types of polymer), with the spatulas used to obtain the polymers being rinsed with acetone after each use.
- 2 drops of concentrated HCl was added to solutions P1-P9.
- All 13 vials were placed on a hot-plate stirrer.