Cham Lab Final
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22 Terms
Buffers ____ changes in pH
Resist
Buffers Contain Either (1)
a weak acid and its corresponding basic salt
Buffers contain either (2)
a weak base and its corresponding acid salt
When a base like NaOH is added to a buffer system, it attacks the ___ part of the system
Acid
When an acid like HCl is added to a buffer system, it attacks the ____ part of the system
Basic
What is the weak acid/basic salt system
HC2H3O2/NaC2H3O2
A mixture of NaOH and HCl ___ make a buffer system
would not
why wouldn’t NaOH and HCl make a buffer system?
Strong acid/strong bases dont make buffer systems
Buffer systems matter in biological systems because…
Biological systems operate within a narrow pH range
An acid is an H+
Donor
A base is an H+
Reciever
Strong Bases can be recognized by the ___ in the formula
OH-
ammonia and its cousin compounds like (compound) are bases because…
They contain exposed electron pair where H+ can dock
What are seven strong acids
HCl, HBr, HI, H2So4, HClo3, HClo4,HNO3
What are 3 weak acids
HF, HC2H3O2, HCOOH
What are 3 strong bases?
NaOH, LiOH, KOH
You can tell a weak acid for 3 reasons
They have a Ka
They don’t completely disassociate
They arent on the list of 7 strong acids
In the biological reaction, H2O + CO2 = H2CO3, H2CO3 is…
Acidic
The basic form of H2CO3 has ost its H+, its formula is…
HCO3-
Where is the buffered region on the curve?
flat part
How do we know its the buffered region
pH doesnt change even though NaOH is added
In order for chemical reactions to occur, reactants have to hit each other with ___ and at the ___
sufficient force, correct orientation