!
!
Exercice 1 : les acides et les bases en cuisine
23$!#4,5&*63!-!56%%(3$!$3!5(*-*3$!*%89*:($!9,!;6#%,&*63!)$!)*6<=)$!)$!5,#>63$?!@A.?!
(&*9*-4!8,#!$<$%89$!86(#!;,*#$!9$B$#!9$!8,*3!$&!9$-!CD&$,(<E!23$!)$-!;,F63-!)$!8#6)(*#$!)(!
@A.!563-*-&$!G!;,*#$!#4,C*#!9HI=)#6C4365,#>63,&$!)$!-6)*(%!J,K@A+!,B$5!9H,5*)$!9,5&*:($?!
8#4-$3&-!),3-!9$-!8#6)(*&-!9,*&*$#-?!56%%$!9$-!=,6(#&-E!
0L M5#*#$!9H4:(,&*63!)$!9,!#4,5&*63!$3&#$!9H,5*)$!9,5&*:($!@K+@KNAKL@A.KN,:L!$&!9H*63!
I=)#6C4365,#>63,&$!K@A+ON,:L!8#6)(*-,3&!)(!)*6<=)$!)$!5,#>63$!C,P$(<E!
Q*! 9$-! *3C#4)*$3&-! 3$! 563&*$33$3&! 8,-! $(<O%R%$-! )$! 9H,5*)$?! 63! (&*9*-$! (3$! 9$B(#$!
5I*%*:($E!S,!9$B(#$!5I*%*:($!563&*$3&!(3!%49,3C$!)$!)*I=)#6C4368I6-8I,&$!)$!-6)*(%!
J,K.TAU! $&! 9HI=)#6C4365,#>63,&$! )$! -6)*(%! J,K@A+E! Q69*)$-?! 5$-! )$(<! $-875$-! 3$!
#4,C*--$3&!8,-!$3-$%>9$!%,*-!),3-!9H$,(?!*9-!9*>7#$3&!K.TAUO!$&!K.@A+!:(*!45I,3C$3&!(3!
8#6&63E!V(,3)!9,!-69(&*63!)$B*$3&!-,&(#4$!$3!K.@A+?!9$!C,P!@A.!-H45I,88$!)$!9,!-69(&*63E!
.L M5#*#$! 9H4:(,&*63! )$! 9,! #4,5&*63! $&! 5,95(9$#! -,! 563-&,3&$! )H4:(*9*>#$! G! 8,#&*#! )$-!
)6334$-E!
Données':'
@63-&,3&$-!)H,5*)*&4!W"!G!.1X@E!A3!)633$!9$-!8W"!G!.1X@!Y!
K+TAU!Y!8W"0!Z!.?0!8W".!Z![?.!$&!8W"+!Z!0.?+!
K.@A+!Y!8W"0!Z!\?U!8W".!Z!0/?+!
!
Exercice 2 : composition d’une eau minérale
A3!-H*3&4#$--$!&6(&!)H,>6#)!,(<!)*;;4#$3&$-!;6#%$-!)(!)*6<=)$!)$!5,#>63$!)*--6(-!),3-!
9H$,(!Y! @A.N,:L!!N)*6<=)$! )$! 5,#>63$! )*--6(-L?! K@A+O!! N*63! I=)#6C4365,#>63,&$L! $&! @A+.O!
N*63!5,#>63,&$LE!
+L ]$8#4-$3&$#!9$!)*,C#,%%$!)$!8#4)6%*3,35$!)$!5$-!*-!$-875$-E!
!
A3!#$97B$!-(#!9H4&*:($&&$!)H(3$!$,(!%*34#,9$!9$-!*3;6#%,&*63-!-(*B,3&$-!Y!
!
^! calcium:( 555( mg/L( _! magnésium:110( mg/L( _! sodium:( 14( mg/L;( sulfates:1479( mg/L;(
hydrogénocarbonates(:403(mg/L;(nitrates(:3,9(mg/L;(pH(Z!7,0(`!
A3!8$(&!-H4&633$#!)$!5$!:($!9H4&*:($&&$!3$!%$3&*633$!8,-!9,!:(,3&*&4!)H*63-!@A+.O!Y!86(#!
#4863)#$!G!5$&&$!*3&$##6C,&*63?!5,95(9$#!9,!5635$3&#,&*63!)H*63-!@A+.O!!),3-!5$&&$!$,(?!8(*-!
9,!%,--$!56##$-863),3&$?!$3!%*99*C#,%%$-!8,#!9*&#$!:"56359(#$E"
a,3-!(3$!$,(!)$!8K!3$(&#$!6(!;,*>9$%$3&!>,-*:($?!63!8$(&!$3B*-,C$#!9,!#4,5&*63!Y!
! ! .!!K@A+O!!!@A+.O!!b!@A.N,:L!