CHEM 104 Exam 3 Questions With Correct Answers.

CHEM /




104
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Exam 3 Questions With Correct Answers
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BUFFER //- //CORRECT //ANSWERS(S)✔✔



-definition //of //buffer

-numerical //requirement //- //CORRECT //ANSWERS(S)✔✔-
a/
/weak /


/acid /


/and /


/its /


/conjugate /


/base /


/or //


a/
/weak /


/base /


/and /


/its /


/conjugate /


/acid /


/that //is //resistant //to //changes //in //pH //when //reacting //with //a //strong //acid //or //strong //base



-must //be //in //a //10:1 //ratio



format //of //buffer //equation //- //CORRECT //ANSWERS(S)✔✔HX //+ //MOH //-> //H2O //+ //MX

acid //. //base //. //water //. //salt

, what //are //the //strong //acids //- //CORRECT //ANSWERS(S)✔✔HCl, //HBr, //HI, //HNO3, //H2SO4, //HClO4



2/
/ways /


/to //find //pH //if //Ka //is //known //- //CORRECT //ANSWERS(S)✔✔1- //make //ICE //table //to //find //H3O+



2- //H-H //law //(pka=-log //ka)



2 //requirement //of //the //H-
H //law //- //CORRECT //ANSWERS(S)✔✔1- //ratio //must //be //between //.1 //and //10

2- /
/the /


/concentration /


/of //conj //base //and //conj //acid //must //each //exceed //Ka //by //a //factor //of //100 //or //more




how /
/to /


/select //


a/
/buffer- //- /


/CORRECT //ANSWERS(S)✔✔acid/base //pair //with //pKa //within //one //pH //unit //of //desired //pH



if //there //are //two, //pick //the //higher //concentration



when /
/to /


/use /


/SCF //table //- //CORRECT //ANSWERS(S)✔✔used //when //adding //a //strong //base //or //strong //acid




what //does //pka //mean //- //CORRECT //ANSWERS(S)✔✔take //the //negative //log



how /
/does /