Solution Preparation ( Experiment 4)

Question 1

____________ concentration can be expressed in a number of ways.

Answer 1

Solutions

Question 2

Some concentrations are express in ____________________, such as in percentage composition and molarity.

Answer 2

• amount of per solute per amount of solution

Question 3

It can also be expressed in _________________ such as in molality.

Answer 3

• Amount of per solute per amount of solvent.

Question 4

Other expressions such as ___________, _____________, and ___________

Answer 4

Mole fraction, Normality, Formality

Question 5

In some solutions that are very dilute, expressions such as; _________, ________ and _____ as more convienient.

Answer 5

parts per thousand, parts per millions and parts per billons

Question 6

Weight percentage Formula

Answer 6

%W/W= (Mass of Solute)/(Mass of Solution) x 100

Question 7

Volume Percentage Formula

Answer 7

%v/v = (Volume of Solute)/ (Volume of Solution) x 100

Question 8

Parts Per Million Formula

Answer 8

ppm = amount of solute / amount of solution x10^6

Question 9

Volume Unit Parts Per Million Formula

Answer 9

ppm = milligram of solute(mg) / Liter of Solution (L)

Question 10

Molarity Formula

Answer 10

M = mole of solute (mol) / liter of solution (L)

Question 11

Molality Formula

Answer 11

m - mole of solute (mol) / kilograms of solvent (kg)

Question 12

________________ is the process of reducing the concentration of a solution by the addition of more solvent.

Answer 12

Dilution

Question 13

Usually, this is done with ___________, though it is not limited to this.

Answer 13

Dilution
Aqueous Solution

Question 14

Dilution Formula

Answer 14

C1V1 = C2V2

Question 15

C1

Answer 15

Initial concentration oof the stock solution

Question 16

V1

Answer 16

Initial Volume obtained from the stock solution

Question 17

C2

Answer 17

Desired Concentration

Question 18

V2

Answer 18

Desired total volume of the solution

Question 19

The students need to bring the following:

Answer 19

2 Plastic Bottles (250mL per bottle)

Question 20

Reagents:

Answer 20

Sodium Hydroxide Pallets (NAOH)
conc. hydrochloric acid (HCl)

Question 21

Instrument

Answer 21

Top-loading balance

Question 22

Molar mass of NaOH is

Answer 22

40.00 g/mol

Question 23

Concentrated HCl is equivalent to

Answer 23

11.65 M

Question 24

Take note that NaOH pelletes are _____ and _________

Answer 24

hygroscopic and corrosive

Question 25

Measure the calcualted volume of concentrated HCl needed in the solution preparatrion, using _____________.

Answer 25

Serological Pipet

Question 26

Be sure not to allow the acid to reach the ___________

Answer 26

rubber aspirator

Question 27

Procedures:

Answer 27

• Calculation for solutions Preparations
• Preparing 0.100M NaOH
• Preparing 0.100M HCl