Solubility and concentrations

Question 1

what is solubility of a substance

Answer 1

the maximum amount of that substance that can can be dissolved in agiven quanitity of solvent

Question 2

as temp increases what happens to solubility

Answer 2

it increases

Question 3

saturated solution

Answer 3

where no more solute can be dissolved at the particular temperature

Question 4

unsaturated solution

Answer 4

where more solute will dissolve at the particular temperatures

Question 5

supersaturated solution

Answer 5

where more solute has been dissolved than is normal at the particular temperature, only possible more certain substances

Question 6

crystallization temperature

Answer 6

temperature where crystals start to form

Question 7

solubility curves show

Answer 7

the relationship between solubiliity and temperature

Question 8

what are the two ways crystallisation can occur

Answer 8

cooling a saturated solution or evaporating the solvent from a solution

Question 9

how does cooling a saturated solution produce crystals

Answer 9

at lower temps the solubility of the solute is reduced and crystals can form

Question 10

when is evaporatig the solvent from a solution to produce crystals used

Answer 10

when salts are wanting to be produced, particuraly mineral salts

Question 11

when temperature increases, the solubility of gases

Answer 11

decreases unlike soolid or lliquid substances

Question 12

why does subility increase as temp increases with solid and liquids

Answer 12

because as temp increases, both the solute and solvent have more energy to overcoe]me tthe forces of attraction that hold the particles together

Question 13

g/100g means

Answer 13

grams of solute per 100g of solvent

Question 14

ppm means

Answer 14

number oof parts of solute per 1 million parts of solvent

Question 15

mgKG-1 means

Answer 15

milligrams of solute per kilograms of solvent

Question 16

% w/w

Answer 16

weight, grams of solute per 100g of solvent

Question 17

% v/v

Answer 17

volume, mL of solute per 100mL of solvent

Question 18

% w/v

Answer 18

grams of solvent per 100 ml of solvent

Question 19

Molarity of a solution means

Answer 19

moles of solute per litre of solution

Question 20

molarity units

Answer 20

mol/L oor mol L-1 or M

Question 21

formula for calculating moles

Answer 21

mass (g)/ molar mass (g/mol)

Question 22

formula to calculate molarity of a solution

Answer 22

molarity (M) = moles of solute / 1 litre of solution

Question 23

how to calculate moles of a solute in a soolution of known concentration

Answer 23

moles = concentraion (mol/litre or M) x V (in litres)

Question 24

how to calculate the concentration of a solution

Answer 24

C=n/V

Question 25

C

Answer 25

concentration in M or mols per litre

Question 26

n

Answer 26

number of mols

Question 27

V

Answer 27

volume in litres

Question 28

how to convert grams per litre into moles per litre

Answer 28

divide by concentration/molarity/M

Question 29

how to convert mole per litre to grams per litre

Answer 29

multiply by concentration/molarity/M

Question 30

formula for concentration in ppm

Answer 30

mass of solute (mg)/ mass of solution (Kg)

Question 31

when are dilutions used

Answer 31

when chemists are given stock solutions and are required to dilute this down to an appropraite strength for use

Question 32

what remains constant when a solution is diluted

Answer 32

the composition of the solution remaains the same aand the number of mols of solute remains the same

Question 33

what changes when a solution is diluted

Answer 33

the concentraion of the solution and the space between the particles of solute increases

Question 34

formula to calculate concentraions or volumes of a solution when it is diluted

Answer 34

C1x V1 = C2 x V2

Question 35

C1

Answer 35

original concentraion of solution

Question 36

V1

Answer 36

original volume of solution

Question 37

C2

Answer 37

concentration of newly diluted solution

Question 38

V2

Answer 38

volume of newly diluted solution