Apparatus:
Safety spectacles
Weighing bottle
Balance capable of weighing to within 0.01g
Spatula
Stirring rod with rubber end
Dropping pipette
Wash bottle of distilled water
Funnel
Volumetric flask, 250 cm3
Beaker, 250 cm3
Retort stand
Burette clamp
Burette, 50cm3
Pipette, 25cm3
Pipette filler
Beaker, 100cm3
White tile
Conical flask, 250cm3
Reagents used:
Distilled Water
Hydrated Sodium Borate
1.0 M Hydrochloric acid
Screened methyl orange
Sodium Borate solution
Method:
Prepare a standard solution of hydrated sodium borate (250cm3 solution)
Place the weighing bottle on the balance and record the mass of the empty bottle.
Add approximately 4.80 grams of the hydrated sodium borate compound into the weighing bottle and record their weight together.
Transfer the measured hydrated sodium borate to the 250 cm3 beaker then find the mass of the weighing bottle once again to see how much of the compound was actually moved
Add small amounts of distilled water into the beaker while constantly stirring the water with the stirring rod and crushing the compound with the rubber end.
These mineral images are free to use how you wish.
English: Sodium borate, borax
Borax Boron Open Pit Mine, Boron, CaliforniaRepeat until compound is fully dissolved (make sure the solution does not rise over 250cm3)
Rinse the volumetric flask with distilled water then transfer the hydrated sodium borate solution into it. Make sure you rinse out the stirring rod, the beaker and the funnel with distilled water and pour this water into the volumetric flask to reduce chances of error (left behind solution).
Make the solution up to 250cm3. To do this make sure that when the bottom of the meniscus is nearing onto the mark at eye level, use the dropping pipette to make sure that you do not pass the mark.
Shake the volumetric flask several times (about eight times) by turning it all the way around and waiting for the solution to move downwards, then turning it back...