1) a small amount of the salt C6H5CO2Na (sodium benzoate) is dissolved in water.
ID: 825550 • Letter: 1
Question
1) a small amount of the salt C6H5CO2Na (sodium benzoate) is dissolved in water. the pH of the resutlng solution is 8.6.
a) write a balanced equation for the rxn which occurs when this salt is dissolved in water.
b) what is the formula of the weak acid that is formed in this rxn
c) why is the pH greater than 7 (i.e., basic)?
2) a small amount of the salt CH3CH2NH3Cl (ethylamine hydrochloride) is dissoved in water. the pH of the resulting solution is 5.3.
a)write a balanced equation for the rxn which occurs when this salt is dissolved in water.
b) what is the formula of the weak base that is formed in this rxn
c) why is the pH less than 7 (acidic)?
8) which of the following would not affect the pH of a HC2H3O2/C2H3O2^-^ buffer solution?
a) adition of 2ml of .1 M HCl
b) addition of 2 ml of .1M NaC2H3O2
c) addition of 2 ml of water
d) addition of 2ml of .1 M KOH
Explanation / Answer
1) a small amount of the salt C6H5CO2Na (sodium benzoate) is dissolved in water. the pH of the resutlng solution is 8.6.
a) write a balanced equation for the rxn which occurs when this salt is dissolved in water.
b) what is the formula of the weak acid that is formed in this rxn
c) why is the pH greater than 7 (i.e., basic)?
2) a small amount of the salt CH3CH2NH3Cl (ethylamine hydrochloride) is dissoved in water. the pH of the resulting solution is 5.3.
a)write a balanced equation for the rxn which occurs when this salt is dissolved in water.
b) what is the formula of the weak base that is formed in this rxn
c) why is the pH less than 7 (acidic)?
8) which of the following would not affect the pH of a HC2H3O2/C2H3O2^-^ buffer solution?
a) adition of 2ml of .1 M HCl
b) addition of 2 ml of .1M NaC2H3O2
c) addition of 2 ml of water
d) addition of 2ml of .1 M KOH
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