When performing titrations, good technique includes: (select all correct answers

Question

When performing titrations, good technique includes: (select all correct answers)

En faisant des titrages, il est mieux de: (sélectionnez toutes les réponses correctes)

Question options:

a)

waiting 30 s after the first colour change to ensure that the endpoint has been reached.

attendre 30 s après le changement de la couleur pour confirmer le point de virage.

b)

performing multiple trials to ensure that the concentration value determined in the trials is accurate to within 2%.

faire plusieurs essais pour confirmer que la concentration est déterminée par les essais et précise jusqu'à 2%.

c)

waiting a few minutes after adding each drop of base.

attendre quelques minutes après l'ajout de chaque goutte de la base.

d)

stirring the solution constantly.

brasser la solution constamment.

e)

adding the indicator at the beginning.

ajouter l'indicateur au départ.

f)

talking to your partner as the base is being added.

parler à votre partenaire pendant l'ajout de la base.

g)

carefully noting the volume of base added.

soigneusement noter le volume de base ajouté.

h)

adding the base more rapidly at first, then slowing the addition as we approach the endpoint.

ajouter la base plus rapidement au début du titrage et diminuer la vitesse de l'ajout vers le point de virage.

a)

waiting 30 s after the first colour change to ensure that the endpoint has been reached.

attendre 30 s après le changement de la couleur pour confirmer le point de virage.

b)

performing multiple trials to ensure that the concentration value determined in the trials is accurate to within 2%.

faire plusieurs essais pour confirmer que la concentration est déterminée par les essais et précise jusqu'à 2%.

c)

waiting a few minutes after adding each drop of base.

attendre quelques minutes après l'ajout de chaque goutte de la base.

d)

stirring the solution constantly.

brasser la solution constamment.

e)

adding the indicator at the beginning.

ajouter l'indicateur au départ.

f)

talking to your partner as the base is being added.

parler à votre partenaire pendant l'ajout de la base.

g)

carefully noting the volume of base added.

soigneusement noter le volume de base ajouté.

h)

adding the base more rapidly at first, then slowing the addition as we approach the endpoint.

ajouter la base plus rapidement au début du titrage et diminuer la vitesse de l'ajout vers le point de virage.

Explanation / Answer

To be followed

a)

waiting 30 s after the first colour change to ensure that the endpoint has been reached

b. performing multiple trials to ensure that the concentration value determined in the trials is accurate to within 2%

d)

stirring the solution constantly.

e)

adding the indicator at the beginning

g)

carefully noting the volume of base added.

h)

adding the base more rapidly at first, then slowing the addition as we approach the endpoint

Not to be done

f. talking to your partner as the base is being added.

c. waiting a few minutes after adding each drop of base. (acid base titrations are fast and no need to wait for minutes after each addition)

a)

waiting 30 s after the first colour change to ensure that the endpoint has been reached

b. performing multiple trials to ensure that the concentration value determined in the trials is accurate to within 2%

d)

stirring the solution constantly.

e)

adding the indicator at the beginning

g)

carefully noting the volume of base added.

h)

adding the base more rapidly at first, then slowing the addition as we approach the endpoint

Not to be done

f. talking to your partner as the base is being added.

c. waiting a few minutes after adding each drop of base. (acid base titrations are fast and no need to wait for minutes after each addition)

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