titration agenda check molarity worksheet notes on titration partners work on titrations

Titration

Agenda

Check molarity worksheet

Notes on titration

Partners work on titrations.

1. A sample of 0.0341 mol iron(III) chloride was dissolved in water to give 25.0mL of solution. What is the molarity of the solution?

0.0341 mol FeCl3 = 1.36 M FeCl3

0.025 L

2. An aqueous solution is made from 0.798g of potassium permanganate, KMnO4. If the volume of

solution is 50.0mL, what is the molarity of KMnO4

in the solution?

0.798 g KMnO4 | 1 mol KMnO4 |

| 158.04 g KMnO4 | 0.0500

L

= 0.100 M KMnO4

3. What volume of 0.120 M CuSO4 is

required to give 0.150 mol CuSO4?

0.150 mol CuSO4 | 1 L CuSO4

| 0.120 M CuSO4

= 1.25 M CuSO4

5. Heme, obtained from red blood cells, binds oxygen, O2. How many moles of heme are there in

25 mL of 0.0019M heme solution?

0.025 L heme | 0.0019 Mol heme| 1 L heme

= 4.8*10-5 mol heme

6. How many grams of sodium dichromate should be added to a 50.0 mL volumetric flask to prepare 0.250 M Na2Cr2O7 when the flask is filled to the mark with water?

0.05 L Na2Cr2O7 |0.250 Mol Na2Cr2O7 |261.97g Na2Cr2O7

|1 L Na2Cr2O7 | 1 mol Na2Cr2O7

= 3.27 g

7. If 56.7g of Na2CrO4 is dissolved in 547

mL, what will be the molarity of this solution?

56.7 g Na2CrO4 | 1 mol Na2CrO4 |

| 162 g Na2CrO4 | 0.547 L

= 0.640 M

9. How many grams of CaCl2 must be dissolved in

water in order to create 751 mL of 4.2 M CaCl2?

0.751 L CaCl2 |4.2 Mol CaCl2 |110.9 g CaCl2

|1 L CaCl2 |1 mol CaCl2

= 350. g CaCl2

10. You wish to prepare 1.00 L of 1.2M HNO3 from a stock solution of nitric acid

that is 15.8M. How many milliliter of stock solution do you require to the dilute solution?

(1.2 M)(1.00 L) = (15.8 M)(V2) V2 =

76 mL

11. You wish to prepare 150 mL of 4.5 M HNO3 from a stock solution of nitric acid.

How many milliliters of 15M HNO3 are

necessary?

(4.5 M)(150 mL) = (15 M)(V2)

V2 = 45 mL

12. You wish to prepare 150 mL of 3.0 M H2SO4 from a stock solution of sulfuric

acid. How many milliliters of 12 M H2SO4

are necessary to create the solution?

(3.0 M)(150 mL) = (12 M)(V2)

V2 = 38 mL

13. You wish to prepare 25.0 mL of 5.0 M H2SO4 from a stock solution of sulfuric acid

that is 18M. How many milliliters of stock solution are needed?

(5.0 M)(25.0 mL) = (18 M)(V2)

V2 = 6.9 mL

14. You wish to prepare 25 mL of 1.5 M HC2H3O2 from a stock solution of acetic acid. How many milliliters of 12M HC2H3O2 are necessary?

(1.5 M)(25 mL) = (12 M)(V2)V2 = 3.1 mL

15. You wish to prepare 655 mL of 0.50 M NaOH. How many milliliters of 6.0M NaOH need to be diluted to create this solution?

(0.5 M)(655 mL) = (6.0 M)(V2)

V2 = 55 mL

Titration

January 10, 2008

Definition

A procedure for determining the amount of substance A by adding a carefully measured volume of a solution with known concentration of B until the reaction of A and B is just complete.

Sometimes called volumetric analysis

What is it?

Titration is putting molarity and stoichiometry together.

Our titrations will primarily deal with acids and bases.

What do you know about acids and bases?

Acids and Bases Song

Chorus:

Acids and bases have two different faces,

Two different personalities,

And you gotta find out what they’re all about,

If you want to learn chemistry.

Now the first thing you gotta get straight in your head,Acids turn blue litmus paper to red.They react with metals with awesome power,They neutralize bases and taste very sour.

Chorus:Acids and bases have two different faces,Two different personalities,And you gotta find out what they’re all about,If you want to learn chemistry.

Bases are different from acids, it’s true,Bases turn litmus paper to blue.They neutralize acids, fell slippery on skin,they taste sorta bitter, and are called alkaline.


Well, there’s even more to this wonderful tale,Something we call a pH scale.It numbers from zero up to fourteen,Those are powers of then, if you know what I mean.


When the pH is 7, then it’s a case,Where the sample is neither acid nor base.But less then 7?...it’s an acid we say,More then 7?...it’s a base all the way.


Acids and bases?...now why should you care?‘Cause acids and bases are everywhere.You put them on salads, and they get in the rain, They settle your tummy, and clean out your drain


So the next time you’re sitting under some shade,And you’re sipping a glass full of real lemonade,You’ll notice the sour taste and think in your head,I bet it turns blue litmus paper to red.


Acids

Start with H

Taste sour

Turn litmus paper red

pH 0 – 7

Bases

Contain OH

Taste bitter

Turn litmus paper blue

pH 7 – 14

Acid-Base Indicators

A dye used to distinguish between acidic and basic solutions by means of the color changes it undergoes in these solutions.

titration agenda check molarity worksheet notes on titration partners work on titrations

Documents