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7 -4: Acids & Bases in Solution What are the properties of acids and bases?

7 -4: Acids & Bases in Solution What are the properties of acids and bases?. Science Standard 8.5.e: Students know how to determine whether a solution is acidic, basic, or neutral. Input. See vocab sheet. Input & Modeling. Acids & Bases in Solution

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7 -4: Acids & Bases in Solution What are the properties of acids and bases?

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  1. 7-4: Acids & Bases in SolutionWhat are the properties of acids and bases? Science Standard 8.5.e: Students know how to determine whether a solution is acidic, basic, or neutral.

  2. Input • See vocab sheet

  3. Input & Modeling Acids & Bases in Solution • An acid produces hydrogen ions in water. • H+ • The hydrogen ion is the KEY in chemical reactions • A base produces hydroxide ions in water • OH- Do you see what the chemical formulas have in common for Acids and bases?

  4. Input & Modeling Strength of Acids & Bases Strength is based on how many ions are formed. • Strong acids and weak acids act differently in water. • Hydrochloric acid is a strong acid. Acetic acid is a weak acid. • Ammonia is a weak base and Lye is a strong base ALL are broken up into ions in a STRONG solution Another word for base is Alkaline

  5. Input & Modeling The pH Scale • A low pH indicates that the concentration of hydrogen ions is big (meaning acidic). In contrast, a high pH indicates that the concentration of hydrogen ions is low. • pH scale is from 0-14- the lower the number the more acid it is • Below 7= acidic • Above 7= basic You use indicators (litmus paper or other) to test pH

  6. Input & Modeling Neutral Solution • If the pH is 7, the solution is neutral. This means that it is neither an acid nor a base. • Pure water has a pH of 7. • If you combine an acid and a base, a neutral solution will be formed. • Just because a solution has low acidity does not mean it is diluted.

  7. Input & Modeling Acid-Base Reactions • In a neutralization reaction, an acid reacts with a base to produce a salt and water. • SALT- is any positive ion formed from mixing an acid and base

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