Acids, Bases, and pHChemistry Goal 10

BrainPop- Acids and Bases

Substances can be classified as acid, base, or neutral based on their pH.

Acids and bases are solutions usually with water as a solvent.

Can be identified by: ◦ Sour taste◦ Reacts with some metals◦ Reacts with bases to form a neutral pH solution◦ pH is less than 7; the lower the number, the more

acidic the solution

Acids

Can be identified by:◦ Bitter taste◦ Slippery feel◦ Reacts with acids to form a neutral pH solution◦ pH is greater than 7; the higher the number, the

more basic the solution.

Bases

Is neither an acid nor a base Pure water is neutral and has a pH near 7

Neutrals

Substances that can be used to determine whether a solution is acidic, basic, or neutral.

Indicators

Changes color in the presence of an acid or a base

Blue litmus paper turns red in an acid and stays blue in a base. ◦ BRA

Red litmus paper turns blue in a base and stays red in an acid. ◦ RBB

Litmus Paper

What Color does Litmus Paper Turn?

Test for a base ONLY Is colorless and turns magenta (bright pink)

in the presence of a base Stays colorless in acidic and neutral

solutions

Phenolphthalein

Has a range of colors depending on the pH of the solution

The color of the paper is compared to a chart to determine the actual pH number.

pH Paper

What is the pH?

A = ______

B = ______

C = ______

D = ______

Red Cabbage Juice IndicatorTest for Acids and BasesThe color of the solution is compared to a chart to determine pH

Zoom Kitchen Lab from Friday

So you think you know about acids and bases?Make a copy of the data sheet on Edmodo