Data Harvest Smart Wireless 1110 Manuale - Pagina 14

Sfoglia online o scarica il pdf Manuale per Accessories Data Harvest Smart Wireless 1110. Data Harvest Smart Wireless 1110 16. Ph sensor

Type 0 into the 'enter value' box and close.

Note: Enter the TOTAL volume of acid added so far.

10. Turn the tap on the burette to add a measured amount e.g. 2 cm

take a sample. Enter the volume of acid added e.g. 2.

11. Vary the amount of acid added as required.

12. Tap or click on the Stop icon to finish recording.

In this titration 2 cm

was added for the first 6 readings then the amount of acid added was reduced

to 1 cm, then after 19 cm

How to create a mV to pH calibration graph

Buffers. You will need a minimum of two buffers, preferably three or more e.g. 4, 7 and 10.

If you are only using two then its best if one is a 'neutral' buffer with a pH of 7, and the second is near

to the expected pH of the samples you will be testing. For example buffers with a higher pH (10) are

best for measuring bases, whereas buffers with a low pH (4) are best for measuring acidic samples.

Once you have chosen your buffers allow them all to reach the same temperature. Pour your buffers

into individual beakers for calibration. Check the temperature of the room and label the value of each

buffer with its pH value at that temperature.

For example: Values of pH buffers a various temperatures:

Temperature ˚C

10˚

20˚

25˚

30˚

(closer to the expected end-point) it was reduced to 0.5 cm

pH 4.0 buffer

pH 7.0 buffer

4.00

4.01

pH Adaptor & Electrode

. Let the solutions mix and

pH 10.0 buffer

7.05

10.10

7.00

10.00

6.99

9.945

6.98

9.90