Presentation is loading. Please wait.

Presentation is loading. Please wait.

PH meter CCC Kei Heep Secondary School F.6 Chemistry by Wong CS Chemistry CE Homepage Chemistry AL Homepage.

Similar presentations


Presentation on theme: "PH meter CCC Kei Heep Secondary School F.6 Chemistry by Wong CS Chemistry CE Homepage Chemistry AL Homepage."— Presentation transcript:

1 pH meter CCC Kei Heep Secondary School F.6 Chemistry by Wong CS Chemistry CE Homepage Chemistry AL Homepage

2 pH value pH =  log [H + ] For 1 M HCl (aq), pH = 0 For 0.1 M HNO 3 (aq), pH = 1 For 10 M NaOH (aq), pH = 15

3 Apparatus pH with a glass electrode Thermometer Buffer solution of pH 4 and 7

4 Calibration Step 1 Insert the electrode and thermometer in distill water. Adjust the temperature knob to the reading of room temperature.

5 Calibration Step 2 Insert the electrode in the buffer solution with pH = 7. Adjust the AP knob to 7.00.

6 Calibration Step 3 Wash the electrode with distill water. Insert the electrode in the buffer solution with pH = 4. Adjust the pH knob to pH = 4.00.

7 Measure pH value Wash the electrode with distill water. Insert the electrode in the solution which you want to test. Record the reading when steady.

8 Weak Acid HA (aq) + H 2 O (l)  H 3 O + (aq) + A  (aq) Initial: x At eq.: x-y y y Assume x >> y

9 Buffer solution HA (aq) + H 2 O (l)  H 3 O + (aq) + A  (aq) Initial: x x At eq.: x-y y x+y Assume x >> y [H + ] = y = K pH = pK

10 Test the pH of most common solution - pH panel


Download ppt "PH meter CCC Kei Heep Secondary School F.6 Chemistry by Wong CS Chemistry CE Homepage Chemistry AL Homepage."

Similar presentations


Ads by Google