Lab Handout: Identifying  Acids and Bases

Prelab:

Acids ? a substance that donates _______ when dissolved in water        

Examples and Uses of Acids:

  • Sulfuric Acid – car batteries
  • Hydrochloric Acid – adjusting swimming pools
  • Citric Acid – candies (sour taste)

 

Bases ? a substance that donates _________ when dissolved in water

Examples and Uses of Bases:

  • Potassium Hydroxide – making soap
  • Calcium Hydroxide – making cement
  • Pyridine – Vitamins and Medicines

Data:

  Record your data and observations in the table below.

SUBSTANCE

DESCRIPTION

pH

Acidic

pH

Basic

Neutral

(pH = 7)

Lemon Juice

 

 

 

 

Acetic Acid (CH3COOH)

 

 

 

 

Astringent

 

 

 

 

Italian Salad Dressing

 

 

 

 

Sodium Hydroxide (NaOH)

 

 

 

 

Baking Soda

 

 

 

 

Orange Juice

 

 

 

 

Distilled Water

 

 

 

 

Listerine Mouthwash

 

 

 

 

Baking Powder

 

 

 

 

Soft Drink (Diet Coke)

 

 

 

 

Tap Water

 

 

 

 

White Vinegar

 

 

 

 

Hand Soap

 

 

 

 

Dishwashing Liquid

 

 

 

 

Laundry Detergent

 

 

 

 

Aspirin (Tylenol)

 

 

 

 

Ibuprofen (Advil)

 

 

 

 

Table Salt

 

 

 

 

Table Sugar

 

 

 

 

Alka-seltzer (tablet antacid)

 

 

 

 

Milk of Magnesia

 (liquid antacid)

 

 

 

 

Hydrochloric Acid (HCl)

 

 

 

 

Soft Drink (Sprite)

 

 

 

 

 

pH Scale:       Indicate the color indicated by the cabbage paper below the pH scale.

 
                   ?     More Acidic               Neutral                   More Basic ?

0       1            3       4       5       6          7                   10      11      12      13      14

<------------------------------------------------------------------------>

                   

         

            The pH of an acid ranges from _________________

            The pH of a base ranges from __________________

Post Lab:

Use your results and prelab to answer the following questions.

1) What substances are acids? How did you determine this?

 

 

 

2)  What substances are bases? How did you determine this?

 

 

 
         3) Rank the following in order of increasing basicity: Drain Cleaner (pH = 14), Antacid (pH = 8), Baking soda (pH = 9)

 

 

 

 

         4) Rank the following in order of increasing acidity: Battery Acid (pH = 0), Black coffee (pH = 5), Stomach Acid (pH = 3)

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