pH and indicators

pH scale range

0-14

pH scale

A measure of the acidity or basicity (alkalinity) of an aqueous solution

100x more acidic

A solution with a pH of 3 is _________ than a solution with a pH of 5

10x more acidic

A solution with a pH of 4 is ________ than a solution with a pH of 5

Indicator

A substance that changes its color when it gains or loses a proton (H+) -helps identify if a solution is an acid or a base

Logarithmic Scale

Each change of a single pH unit signifies a tenfold change in the (H+)

Each indicator

Has a pH range where it changes color

Both colors

If the solution is at a pH in between the values, the indicator contains _____

Table M

Lists 6 acid-base indicators

pH scale measures

The concentration of Hydrogen ions

Nuetral

pH of 7

Acidic

pH<7 , (H+) > (OH-)

Basic

pH> 7 , (H+) < (OH-)