pH probe practical
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5 Terms
Why is the probe rinsed thoroughly with water?
To make sure there is no excess solution from previously tested solutions
That would contaminate the buffer solution
Why is the bulb fully immersed?
So that the bulb is fully in contant with the solution
And so can give a more accurate reading
What is the point of the calibration graph?
A calibration graph is drawn as the actual pH of the solution and the reading on the pH probe may vary slightly
Therefore the calibration graph is made to convert the readings of the pH probe into more accurate values, to account for any systematic errors if the pH probe is taking incorrect readings
Why is the burette filled below the tap
To prevent the initial titre volume being too high if an air bubble is present
Why are 2.0cm3 portions done?
To give readings close enough to the point of neutralisation (equivalence point)
But not too small that the titration takes too long to complete