Exam-Style Volumetric Problems (Leaving Cert Chemistry): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
When using the formula moles , what must be true?
When using the formula moles , what must be true?
Volume must be in cm³
In the formula , what do the values represent?
In the formula , what do the values represent?
Number of moles from balanced equation
Which formula calculates moles when you know mass and relative molecular mass?
Which formula calculates moles when you know mass and relative molecular mass?
When preparing a standard solution, how many times should you invert the stoppered flask?
When preparing a standard solution, how many times should you invert the stoppered flask?
About 20 times
Where should the meniscus be positioned when using a volumetric flask?
Where should the meniscus be positioned when using a volumetric flask?
Bottom of meniscus on graduation mark
When should starch indicator be added in an iodine-thiosulfate titration?
When should starch indicator be added in an iodine-thiosulfate titration?
When solution becomes pale yellow
What colour change indicates the end point in an iodine-thiosulfate titration with starch?
What colour change indicates the end point in an iodine-thiosulfate titration with starch?
Blue-black to colourless
Which indicator is used in iodine-thiosulfate titrations?
Which indicator is used in iodine-thiosulfate titrations?
Starch solution
Why is distilled water preferred over tap water in iodine-based titrations?
Why is distilled water preferred over tap water in iodine-based titrations?
Tap water contains chlorine ions
Before using a pipette, what should you rinse it with first?
Before using a pipette, what should you rinse it with first?
Distilled water, then the solution
What should you do with the last drop remaining in a pipette after discharge?
What should you do with the last drop remaining in a pipette after discharge?
Leave it in the pipette
How many significant figures should usually be used in volumetric analysis calculations?
How many significant figures should usually be used in volumetric analysis calculations?
3 or 4 significant figures