Aqa A Level Chemistry 3.1.12 - Acids And Bases Questions And Right Verified Answers.

AQA A LEVEL CHEMISTRY 3.1.12 - ACIDS AND
BASES QUESTIONS AND RIGHT VERIFIED
ANSWERS.
Bronsted-Lowry,acid,,,ANS,-,Proton,donor



Bronsted-Lowry,base,,,ANS,-,Proton,acceptor



pH,,,ANS,-,Measure,of,acidity,by,measuring,concentration,of,H⁺,ions.



Low,pH,means,,,ANS,-,Acidity



High,pH,means,,,ANS,-,Alkalinity



Calculating,pH,,,ANS,-,pH,=,-log,[H⁺]



Calculating,[H⁺],,,ANS,-,-pH

[H⁺],=,10



What,does,an,acid/base,reaction,involve?,,,ANS,-,Transfer,of,the,H⁺,from,the,acid,to,the,base.



Strong,acid,,,ANS,-,Fully,dissociates,in,water.



Weak,acid,,,ANS,-,Only,very,slightly,dissociates,in,water.



Ka,weak,acid,dissociation,constant,,,ANS,-,Ka,=,[H⁺],[A⁻]

,[HA]




The,more,a,weak,acid,dissociates...,,,ANS,-,The,more,H⁺,are,formed.

, The,stronger,the,acid.

The,larger,the,Ka,value.



Calculating,pKa,,,ANS,-,pKa,=,-log,(Ka)



Calculating,Ka,from,pKa,,,ANS,-,-pKa

Ka,=,10



Dissociation,of,water,,,ANS,-,H₂O,⇌,H⁺/H₃O⁺,+,OH⁻



When,water,boils,what,happens,to,it's,pH?,,,ANS,-
,Water,dissociating,is,endothermic,,and,the,reverse,reaction,is,exothermic.

Le,Chatelier's,principle.

Equilibrium,shifts,to,right,to,lower,temperature.

More,H⁺,so,pH,lower,(more,acidic).



Oxonium,ion,,,ANS,-,H₃O⁺



The,ionic,product,of,water,(at,298K),,,ANS,-,Kw,=,[H⁺],[OH⁻],=,1.0,x,10⁻¹⁴



Calculating,pH,of,a,base,,,ANS,-,[H⁺],=,Kw

,[OH⁻]




Buffer,,,ANS,-
,Solution,that,maintains,an,almost,constant,pH,on,addition,of,small,amounts,of,strong,acid,or,strong,base.




What,does,an,acidic,buffer,consist,of?,,,ANS,-,Weak,acid,(HA),with,its,salt,(Na⁺A⁻)



What,does,a,basic,buffer,consist,of?,,,ANS,-,Weak,base,with,its,salt.