required practical 1A

• 1. the task is to prepare 250cm3 of a solution of NaHSO4 with a known concentration in the range 0.0900 to 0.110 moldm-3
• 2. calculate the mass of NaHSO4 solid needed to produce 250cm3 of a 0.100moldm-3 solution (If you are using the anhydrous solid, the mass to weigh out will be between 2.7-3.3 g and if using the monohydrate, the mass should be between 3.1-3.8g)
• 3. weigh a clean dry weighing bottle (or weighing boat)
• 4. place the weighing bottle on the pan of a digital balance, and, using a spatula, place into the bottle approximately the mass of NaHSO4 that you have calculated to be necessary
• 5. weigh the weighing bottle and its contents accurately and record the precise mass
• 6. pour the contents of the weighing bottle into a beaker and re-weigh the weighing bottle (still may contain traces of NaHSO4)
• 7. calculate the mass of NaHSO4 that you have transferred. Remember to record all weighings to the precision of the balance used
• 8. add approximately 100cm3 of distilled/de-ionised water to the beaker containing the solid and using a glass rod, stir the contents of the beaker until all the NaHSO4 dissolves
• 9. using a funnel, pour the contents of the beaker into a 250cm3 volumetric/graduated flask and then using the wash bottle rinse the beaker and funnel into the same volumetric flask. Rinse the glass rod into these washings
• 10. make the volumetric flask up to the graduated mark by carefully adding distilled water from the wash bottle. Need to be careful to not go over it
• 11. stopper the volumetric flask and shake it thoroughly to mix the contents of the flask
• 12. calculate the exact concentration in mol dm-3 of the solution quoting the value to the appropriate precision