IPS Study Guide

4.9-Acidification Lab

Gases dissolved in Our Atmosphere

  1. The Gases create an acidic solution
  • Carbon Dioxide
  • Sulfur Dioxide
  • Hydrogen Chloride

2. Hard water- high calcium carbonate amount

3. Carbonic acid= dissolved CO2

4. Sulfur Dioxide-> acid rain

Sinkholes and Limestone Notes

  1. Limestone: soft, porous (holds water)/water soluble-> carbonic acid
  2. Sinkholes are common in FL because: limestone underground and was once covered by ocean
  3. Sulfuric Acid

  • discovered in 8th century by alchemist->alchemy->chemistry
  • uses: lead acid batteries, fertilizers, steel industry, dried fruit production


Phenol Red Notes and Acidification Post Lab

Phenol Red:

  • ph indicator: red-> basic clear->acidic

Acidification Post Lab:

  • Phenol red changed color as you add carbon dioxide into water
  • the carbon dioxide turns to carbonic acid and lowers the ph of the water
  • calcium tablet is more soluble in cup with straw because the carbonic acid lowers the ph and dissolved the tablet quickly

Ocean Acidification

  • 8.1->8.4 is ideal ph for marine life
  • ocean's ph has decreased 0.1 in the past about 100 years (about 25% decrease)
  • lower ph will cause shelled animals to not be able to build a shell

Two Gases Post Lab


  • in the inverted test tube
  • gas is ignited and rushes out of the test tubes
  • when the gas is escaping, it rubs against the test tube (friction) causing the sound

Carbon Dioxide is a dense gas and it sinks

Hydrogen is a light gas and it rises

  • inverted test tube(magnesium and acid)-> filled with hydrogen and gas cannot escape
  • upright test tube(magnesium and acid)-> filled with air and gas escapes
  • inverted test tube (magnesium and carbonic acid)-> filled with air and gas escapes
  • upright test tube (magnesium and carbonic acid)-> filled with CO2 and gas cannot escape