Acids and Bases

pH Scale

Acids and Bases

• Acids– pH between 7 and1– Sharp or sour smell

• Vitamin C, gastric juice

– Donate a Hydrogen (H+) to solution

• H-Cl • Hydrochloric Acid

• Bases– pH between 7 and 14– Feel slippery

• Milk, Ammonia

– Accept a Hydrogen from solution (OH-)

• Na-OH• Sodium Hydroxide

Water is Neutral!

• pH of 7

Water (Dissasociated)

Both contributes and accepts hydrogen ions in solution

*ions = atom or particle with positive or negative charge

Indicators

• Change color in the presence of acidic or basic solution– Litmus Paper– Bromthymol Blue– Phenothalin

• Other indicators– Iodine (starch)– Benedict’s Solution

(glucose)

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