Acids and Bases. HA H + + A - HCL H + + CL - CH 3 COOH H + + CH 3 COO -

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Presentation transcript:

Acids and Bases

HA H + + A - HCL H + + CL - CH 3 COOH H + + CH 3 COO -

Strong Weak

0.003M HCl 9M HNO 3 7M CH 3 COOH ethanoic acid or acetic acid 5% ethanoic acid (vinegar) Use dilute or concentrated and weak or strong to describe the acids above.

2H 2 O H 3 O + + OH - [H + ] [OH - ] [H 2 O] H 2 O H + + OH - K c = K w = [H + ] [OH - ] =

[H + ] for pure water is 1 X K w = [10 -7 ] [10 -7 ] = pH is -log [H + ] So the pH of pure water is 7

HA H + + A - H + + OH - H 2 O during titration Strong/weak acids cannot be differentiated by titration.

Mohr burette Remember to: Remove bubbles from the valve area Record data as you titrate including uncertainties What is the second burette for? Flush your burette with distilled water when finished

Acidic pH Basic pH Phenolphthalein