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pH meter CCC Kei Heep Secondary School F.6 Chemistry by Wong CS Chemistry CE Homepage Chemistry AL Homepage
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
Apparatus pH with a glass electrode Thermometer Buffer solution of pH 4 and 7
Calibration Step 1 Insert the electrode and thermometer in distill water. Adjust the temperature knob to the reading of room temperature.
Calibration Step 2 Insert the electrode in the buffer solution with pH = 7. Adjust the AP knob to 7.00.
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.
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.
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
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
Test the pH of most common solution - pH panel
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Applications of Aqueous Equilibria Common Ions When we dissolve acetic acid in water, the following equilibrium is established: –CH 3 COOH CH 3 COO -
Properties of acids n Taste Sour (kids, dont try this at home). n Conduct electricity. n Some are strong, some are weak electrolytes. n React with metals.
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Acids and Bases. Ionization of Water H 2 O + H 2 O H 3 O + + OH - K w = [H 3 O + ][OH - ] = 1.0
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Slide 1 Back Chapter 16-Acids and Bases Chapter 16 Acid-Base Equilibria AP CHEMISTRY Content from The Central Science, 9 th ed David P. White, revised.
PH and pOH Chem 332 – ODette. pH (Potential of Hydrogen) Measures the degree of acidity or basicity of an aqueous solution Corresponds to the hydrogen.
PH Scale In this presentation you will: explore how to measure the strength of acids and bases Next >
Chapter 17 Additional Aspects of Aqueous Equilibria Chemistry: The Central Science, 10th edition Theodore L. Brown, H. Eugene LeMay, Jr., and Bruce E.
Todays lesson is brought to you by 7, 14, and the letters Kw, pH.
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