ACIDS, BASES, & pH MAIN IDEAS 1.ACIDS 2.BASES 3.pH SCALE 4.BUFFERS Objective SWBAT explain the properties of acids and bases utilizing indicators with.

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Presentation transcript:

ACIDS, BASES, & pH MAIN IDEAS 1.ACIDS 2.BASES 3.pH SCALE 4.BUFFERS Objective SWBAT explain the properties of acids and bases utilizing indicators with the pH scale to identify & define them. IaN pg. 37 Don't find fault, find a remedy. - Henry Ford

Polar Water molecules can react to form ions hydrogen ion hydroxide ion Hydrogen & Hydroxide Ions form when water molecules are broken apart.

I. Acids I. Acids/ Acidity A.pH < 7 (Smaller # = Stronger Acid) B. Taste sour, burn skin, react with carbonate (CO 3 ), react with metals producing H 2, Turns litmus paper RED

C.Acids produce a in reactions. C.Acids produce a H+ ions in reactions Acids Ionize H 2 O producing Hydronium ions H + + H 2 O H HCl H + + Cl - Hydrochloric Acid PRODUCTSREACTANTS

A. pH > 7 (Larger # = Stronger Base) B. Taste bitter, burn skin, feels slippery, Turns litmus BLUE II. Bases / Alkalinity

C. Bases dissolve in H 2 O to produce Hydroxide ions. NaOH Na + + OH - NaOH Na + + OH - Sodium Hydroxide

Strongly AcidicStrongly Basic Neutral III. pH Scale pH 7 = base OH - H Measures concentration of Hydroxide & Hydronium Ions OH - H pH of 7 has equal numbers of H + and OH - ions so it is neutral

Buffers Cells in human body need to maintain a pH between 6.5 and 7.5 Buffers help prevent sharp changes in pH Buffers are weak acids and weak bases

IV. Neutralization Reactions 1. Upset Stomach = Increased stomach acid Ant acid = BASE (TUMS) Stomach Acid + Tums (Base) WATER + Salt A. Mixtures of Acids & Bases produces neutral solutions (When their strengths are similar!) PRODUCTS REACTANTS

pH Scale Increasing Strength Neutral Increasing Strength Turn you IaN sideways & use the WHOLE page on IaN pg. 36