Strength of Acids & Bases Strong vs. Weak pH

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Presentation transcript:

Strength of Acids & Bases Strong vs. Weak pH

A. Strong vs. Weak Strong Acid/Base 100% ions in water strong electrolyte HCl, HNO3, NaOH, LiOH - + Weak Acid/Base few ions in water weak electrolyte HC2H3O2, NH3 - +

B. pH Scale pH a measure of the concentration of H3O+ ions in solution measured with a pH meter or an indicator with a wide color range 7 INCREASING ACIDITY NEUTRAL BASICITY 14

pH of Common Substances B. pH Scale pH of Common Substances

Concept Test Which of the following "molecular" pictures best represents a concentrated solution of the weak acid HA? A B

Concept Test Which of the following "molecular" pictures best represents a concentrated solution of the weak acid HA? A B

Concept Test Is the following statement TRUE or FALSE? A strong acid has a lower pH than a weak acid.

Concept Test Is the following statement TRUE or FALSE? A strong acid has a lower pH than a weak acid. FALSE - Strong/weak refers to amount of ionization whereas pH refers to concentration of H+.