IPS study guide
4.9 - Acidification Lab & 2 gases
Two Gases
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
Why it "pops"
Experimental errors
-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
-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
Sulfuric Acid
-uses:
- Lead Acid batteries (cars)
- fertilizers
- steel industry - prevents rust corrosion
- dried fruit production (hydrotropic)
Gases dissolved in our atmosphere
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
Phenol Red
red: basic
clear: acidic
Acidification Post lab general
-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
-do not bubble water long enough
-both cups do not have same amount of water