(L16) - Expressing Solubility

Question 1

What are the two ways of expressing solubility?

Answer 1

(i) Semi- quantitative
(ii) quantitative

Question 2

What are the different terms for (i) semi-quantitative units?

Answer 2

• very soluble
• freely soluble
• soluble
• sparingly soluble
• slightly soluble
• very slightly soluble
• practically insoluble or insoluble

Question 3

What part of solvent/1 part solute for very soluble?

Answer 3

Less than 1 part

Question 4

What part of solvent/1 part solute for freely soluble?

Answer 4

1-10 parts

Question 5

What part of solvent/1 part solute for soluble?

Answer 5

10-30 parts

Question 6

What part of solvent/1 part solute for sparingly soluble?

Answer 6

30-100 parts

Question 7

What part of solvent/1 part solute for slightly soluble?

Answer 7

100-1000 parts

Question 8

What part of solvent/1 part solute for very slightly soluble?

Answer 8

1000-10 000 parts

Question 9

What part of solvent/1 part solute for insoluble?

Answer 9

> 10 000 parts

Question 10

Ways of expressing solubility (ii) quantitative units?

Answer 10

-% (w/w), (w/v)
- molarity, molaity, normality
- mole fractions
- ml of solvent requires to dissolve 1g of solute