Unit 3 Chapter 4: Volumetric analysis

Question 1

Primary standard is suitable if (out of 5):

Answer 1

o Readily obtainable in pure form
o Has known chemical formula
o Easy to store without deteriorating or reacting
o High molar mass to minimise effect of error in weigh
o Inexpensive

Question 2

Standard solution

Answer 2

solution of accurately known concentration

Question 3

pH curve

Answer 3

graph showing the change in pH during acid-base titration (shape depends on concentration of acids and bases used)

Question 4

Volumetric analysis

Answer 4

analytical technique for determining concentration of solution by titrating it against solution of known concentration and volume (standard solution)

Question 5

Accuracy

Answer 5

how closely a measurement agrees with the true value

Question 6

Precision

Answer 6

how close a set of measurements are to each other

Question 7

Systematic error

Answer 7

produces constant bias in measurement which cannot be eliminated by repeating the measurement

Question 8

Random error

Answer 8

can be reduced through repetition