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Transcription:

P r o f. d r. W. G u e d e n s L i c. M. R e y n d e r s

D 2 Chemie o e l s t e l l i n g B e pal i n g v an d e c o n c e n t r at i e z u u r i n w i t t e w i j n d o o r u i t v o e r i n g v an e e n z u u r -bas e t i t r at i e. W a t g a j e o n d e r z o e k e n? T i j d e n s d e z u u r -bas e t i t r at i e v an w i t t e w i j n ( o n be k e n d e c o n c e n t r at i e aan z u u r ) m e t e e n 0,5 M N ao H o pl o s s i n g r e g i s t r e e r j e m e t e e n ph -s e n s o r d e ph bi j v e r s c h i l l e n d e t o e g e v o e g d e v o l u m e s bas e. U i t d e m e e t r e s u l t at e n be r e k e n j e d e o n be k e n d e c o n c e n t r at i e z u u r i n w i j n. W a t h e b j e n o d i g? C B L 2 e n T I 3 / 8 4 P l u s e n s o r N H o s s i n g W i t t e w i j n ( o n k e n d e c o n c e n t r i e z u u r e n k e l e d r u l s f e n o l f t e ï n e ( = z u u r e i n d i c o r e e n r e t v m l e e n t r e c h t e r m n e t i s c h e r o e r d e r m e t r o e r s t j e s t i e f m e t r e t k l e m k e r g l ( 2 m l ( = t i t r i e k e r v o l t ( 1 m l e e n t v u l l e r g e d e m i n e r i s e e r d w e r e e n v e i l i g h e i d s i l -8 ph -s ao -o pl 0,5 M be at aan ) ppe al -bas at ) bu an 50 ag aaf at bu be as 50 ) at be ) pi pe 00 ) pi pe al at br

3 Chemie A a n d e s l a g! Voorbereiding van de sensor 1. P l u g d e ph -s e n s o r i n k an aal 1 ( C H 1 ) v an d e i n t e r f ac e ( C B L 2 ) 2. V e r bi n d d e i n t e r f ac e m e t j e r e k e n t o e s t e l. Voorbereiding van de rek ent oest el 1. S t ar t d e t o e pas s i n g D at amat e. 2. D r u k e v e n t u e e l o p o m D at amat e t e i n i t i al i s e r e n. 3. K i e s, i n d i e n d e m o d e n i e t o p E V E N T S W I T H E N T R Y s t aat, 1 : S E T U P i n h e t h o o f d m e n u. S e l e c t e e r i n d i t g e v al m e t e n MO D E e n d r u k Í. K i e s v o o r 3 : E V E N T S W I T H E N T R Y u i t h e t S E L E C T MO D E -m e n u e n s l u i t af m e t O K. Voorbereiding van de t it rat ie 1. Z e t d e bu r e t v as t i n d e bu r e t k l e m. 2. P l aat s e e n t r e c h t e r o p d e bu r e t e n v u l d e bu r e t m e t d e N ao H -o pl o s s i n g ( 0,5 M). 3. D o e m e t d e v o l pi pe t 1 00 m l w i t t e w i j n i n d e t i t r at i e be k e r. 4. B r e n g e r h e t r o e r s t aaf j e i n e n pl aat s d e t i t r at i e be k e r o p d e r o e r d e r. 5. D o e e n k e l e d r u ppe l s f e n o l f t al e ï n e i n d e t i t r at i e be k e r. 6. S t ar t h e t r o e r e n. L e t o p d e k l e u r v an d e o pl o s s i n g! 7. D r aai m e t h e t pl as t i c f l e s j e w aar i n d e ph -s e n s o r s t e e k t t e r w i j l j e d e s c h r o e f d o p v as t h o u d t. 8. H e t f l e s j e k o m t l o s v an d e ph -s e n s o r. G i e t d e i n h o u d v an h e t f l e s j e n i e t w e g!!!! 9. S po e l d e ph -s e n s o r m e t g e d e m i n e r al i s e e r d w at e r. 1 0. B r e n g d e ph -s e n s o r i n d e o pl o s s i n g e n z o r g d at h e t r o e r s t aaf j e n i e t t e g e n d e ph -s e n s o r bo t s t.

M 4 Chemie et ing 1. S t ar t d e m e t i n g. 2. A l v o r e n s N ao H -o pl o s s i n g aan d e w i j n t o e t e v o e g e n, d r u k j e o p Í. V u l 0 i n al s w aar d e. D i t g e e f t aan d at j e n o g g e e n h o e v e e l h e i d N ao H -o pl o s s i n g ( i n m l ) h e bt t o e g e v o e g d. 3. V o e g n u 5 m l N ao H -t i t r an s t o e : j e z i e t d e ph -w aar d e t o e n e m e n. A l s d e ph g e s t abi l i s e e r d i s, d r u k d an Í. V u l h e t t o e g e v o e g d aan t al m l N ao H -o pl o s s i n g, 5, i n. D i t i s j e t w e e d e m e e t w aar d e. 4. H e r h aal d e v o r i g e s t ap t e l k e n s e n r e g i s t r e e r n au w k e u r i g h e t aan t al m l N ao H o pl o s s i n g d at t o e g e v o e g d w e r d. J e k an h i e r v o o r g e br u i k m ak e n v an d e t abe l o p pag i n a 6. 5. D i c h t bi j h e t e q u i v al e n t i e pu n t v o e g j e s t e e d s m i n d e r N ao H -t i t r an s t o e bi j e l k e m e t i n g. W at i s d e k l e u r v an d e o pl o s s i n g i n h e t e i n d pu n t v an d e t i t r at i e? 6. D r u k o m d e m e t i n g t e be ë i n d i g e n. D e g r af i e k v e r s c h i j n t o p h e t s c h e r m. 7. G a m e t d e c u r s o r n aar h e t m e e t pu n t w aar d e ph d e g r o o t s t e s pr o n g m aak t. D e bi j h o r e n d e x -w aar d e i s h e t v o l u m e ( i n m l ) N ao H -o pl o s s i n g, d at w e r d t o e g e v o e g d bi j h e t e i n d pu n t v an d e t i t r at i e. O pm e r k i n g H e t e i n d pu n t v an d e t i t r at i e k an i e t s v e r s c h i l l e n v an h e t e q u i v al e n t i e pu n t. D i t n o e m e n w e d e t i t r at i e f o u t.

5 Chemie Vragen a. B i j w e l k e ph m aak t j o u w c u r v e d e g r o o t s t e s pr o n g? b. H o e z o u j e d e t i t r at i e f o u t z o k l e i n m o g e l i j k k u n n e n m ak e n? 8. D r u k o p Í o m w e e r i n h e t h o o f d s c h e r m t e k o m e n. D r u k n u 6 : Q U I T o m D at amat e t e v e r l at e n. O p h e t s c h e r m z i e j e i n w e l k e l i j s t e n d e m e e t g e g e v e n s z i j n be w aar d. L 1 be v at h e t v o l u m e N ao H d at w e r d t o e g e v o e g d e n L 2 d e o v e r e e n k o m s t i g e ph -w aar d e n.

6 Chemie C o n c l u s i e s V i a d e S T A T -e d i t o r k an j e d e r e s u l t at e n v e r d e r be s t u d e r e n. D r u k S T A T < E D I T > 1 : E D I T o m d e l i j s t e n t e be k i j k e n. N o t e e r j e m e e t r e s u l t at e n i n d e o n d e r s t aan d e t abe l.