What property is an acid-base indicator used to measure

A pH indicator is used to measure the acid-base property of a substance. These chemical detector for hydronium ions (H3O+) or hydrogenions (H+) are mostly weak acids and responds to changes in the hydrogen ion concentration. The pH changes to different colors depending on whether they are added to an acid, a base or a neutral substance.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.