IPS study guide

4.9 - Acidification Lab & 2 gases

Two Gases

Purpose: to collect and compare the gases produced by the reaction of sulfuric acid with both pure magnesium and magnesium carbonate.


Magnesium Carbonate Acid - Carbon Dioxide

-dense gas (sinks)

-when upright, gas can't escape and flame goes out

-when inverted, gas escapes, so the flame continues to burn


Magnesium Acid - Hydrogen

-light gas (rises)

-when upright, gas escapes and flame continues

-when inverted, gas can't escape, so when flame goes in there is an explosion

Big image

Why it "pops"

hydrogen ignites and rushes out of the test tube. Rubs against glass and causes friction, so the energy must go somewhere (sound)

Experimental errors

-not waiting 30 seconds

-unstopper before inverting

-breaks surface of water with test tube

-does not collect full test tube of gas

-air bubbble in test tube

-stoppers not tight

-not keeping test tubes vertical

Sinkholes/Limestone

Limestone:

-soft, porus (holds water)

-water soluble -> carbonic acid

-Sink holes are common in Florida becasue of lots of limestone underground and was covered by ocean in the past

Big image

Sulfuric Acid

-Discovered in 8th century by Alchemists (Alchemy -> chemistry)

-uses:

  • Lead Acid batteries (cars)
  • fertilizers
  • steel industry - prevents rust corrosion
  • dried fruit production (hydrotropic)

Gases dissolved in our atmosphere

carbon dioxide

sulfur dioxide

hydrogen chloride

(all create acidic solution)


carbonic acid -> dissolved carbon dioxide

sulfur dioxide -> "acid rain" ----> (kills forest, pollutes water such as riveres lakes and ponds)


  • volcanos
  • industrial polution
Big image

Phenol Red

ph indicator

red: basic

clear: acidic

Big image

Acidification Post lab general

-phenol red chages color if you add carbon dioxide into water

-the carbon dioxide turns to carbonic acid lowering the ph of the water

-the calcium tablet is more soluble in cup with straw

-this is because the carbonic acid lowers ph and dissolves calcium faster

Errors

-not enough phenol red in water

-do not bubble water long enough

-both cups do not have same amount of water