Siti Aminah Ppt Lp Kd 3.1 About Molarity

8/13/2019 Siti Aminah Ppt Lp Kd 3.1 About Molarity

1/18

1Copyright@2013 Siti aminah 06101010009


2/18

2

REACTIONSRATE

MOLARITY

trialtime change

tempraturecatalyticSurfacearea

Concentrationof reactants

Influence by:

reaction order


3/18

Reaction rateReaction rate or speed of reactionstating the number of chemical

reactions that take place per unittime. The reaction rate expressed inmolarity of solute reactiongenerated every second reaction.

3


4/18

Explain the meaning and usefulnessmolarity

Calculate the concentration of thesolutionCreate a solution with a certain molarity

4

Check TheIndicators


5/18

Concentrations of Solutions

Water must be tested continually toensure that the concentrations ofcontaminants do not exceed establishedlimits.These contaminants include metals,pesticides, bacteria, and even the by-products of water treatment. You willlearn how solution concentrations arecalculated.

(molarity)

16.2


6/18

6

The mole is a unit of amount ofsubstance which specifies the number ofa substance (atoms, molecules, or otherparticles). One mole is defined as theamount of substance that contains asmany particles of the substancecontained in the 12,000 atom gram atom

C-12.


7/18

7

- A measurement of theconcentration of asolution

- Molarity ( M) is equal tothe moles of solute (n)per liter of solution (V)

mL1000

moles

Liter

moles M M= m x 1000

Mr V (mL)


8/18

8

Massof Solute

Molarity

Molof Solute


9/18

Example of Calculating Molarity

Determine the molarity of a solution prepared bydissolving 4 grams of NaOH into the water, in order toobtain 200 mL of solution. (Mr NaOH =40)An alys is of the problem:

known mass of solute and volume of solution, thenyou are asked to determine the molarity of the solution.Molarity is the number of moles of solute divided by thevolume of the solution. so all you have to do is:

g of NaOH moles of NaOH molarity

9


10/18

LecturePLUS Timberlake 10

Learning Check Moles of NaOH, n = m = 0,4 gr =0,1 mol

Mr 40 gr/mol Solutions Volume = 200 mL = 0,2 LSo, The molarity Is :M = n = 0,1 mol = 0,5 mol L -1

V 0,2 L


11/18

Molarity Vs Dilution

In a dilution ,water is addedvolume increases

concentration of solute decreases

11


12/18

Initial and Diluted Solutions

In the initial and diluted solution,the moles of solute are the samethe concentrations and volumes are related

by the following equations:For molarity

M1V 1 = M 2V 2Concentra ted Dilutedso lu t ion so lu t ion

12


13/18

16.4


14/18


15/18

Relat ionsh ip B etween m olar ity wi th leve ls ofso lu t ion

M = x 10 x dMr

with M = molarity, d = levels (%) solution, =density of the solution and

Mr = relative molecular mass of the solute insolution is concerned. 15


16/18

Example

Calculate the molarity of sulfuricacid containing 96 H 2 SO 4 ,density of 1.8 kg L -1

16


17/18

M = x 10 x %

Mr

M = 1,8 kg /L x 10 x 96 %98 gr/molM= 17,63 m0l/ L

17


18/18

18

Siti Aminah Ppt Lp Kd 3.1 About Molarity

Documents

Transcript of Siti Aminah Ppt Lp Kd 3.1 About Molarity