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Chem lab 5
Acids & Bases
24
Chemistry
Undergraduate 1
04/11/2010
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Term
ammonia
 Definition
NH3
Term
acetic acid
 Definition
HC2H302
Term
carbon dioxide
 Definition
CO2
Term
carbonic acid
 Definition
H2CO3
Term
hydrochloric acid
 Definition
HCL
Term
sodium bicarbonate(sodiaum hydrogen carbonate)
 Definition
NaHCO3
Term
sodium hydroxide
 Definition
NAOH
Term
sodium chloride
 Definition
NACl
Term
sulfuric acid
 Definition
H2SO4
Term
pH indicators
 Definition
red & thymol blue litmus paper, red cabbage
Term
H2CO3 + H20
 Definition
H30 + HCO3
Term
H2CO3(aq)
 Definition
H20 + CO2(g)
Term
H20 + CO2(g)
 Definition
H2CO3(aq)
Term
H2CO3 -> <-
 Definition
H2O +CO2
Term
Name the molecule in red cabbage pH indicator that undergoes color changes
 Definition
anthocyanin (flavonol)
Term
Blue thymol
 Definition
better indicator of acidic concentrations [pH] (1.2-2.8)
Term
red pH indicator
 Definition
better at indicating base concentrations,no change for higher [H+]
Term
bases tested [OH]
 Definition
NaOH, NH3
Term
acids tested [pH]
 Definition
HCL,H2SO4,HC2H302
Term
neutral solution tested
 Definition
NaCL
Term
3rd acid/base indicator
 Definition
phenolphthalein (changes color for bases)
Term
Cabbage indicator (serial dilution/5)
 Definition
0-4 deep pink-lt purple,10-14 ltpurple-yellow
Term
Blow into a basic sltn w/straw??
 Definition
pH decreases (becomes MORE acidic)->[H+] increasesBECAUSE...CO2 + H2O ->is a reversible reaction...creating:H2CO3 (which reactes in/with H20 to create->H3O[H+] + HCO3 (a weak acid)which is why pH decreases (becomes more acidic)
Term
PTII: HCO3(weak acid)donates H+'s to the H2O>conversely reducing by same ration OH-'s;this causes pH of solution to decrease
 Definition
become MORE acidic
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