Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of...
-
Upload
christiana-brown -
Category
Documents
-
view
220 -
download
1
Transcript of Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of...
![Page 1: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/1.jpg)
Today:
Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1
![Page 2: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/2.jpg)
Molarity Problems 11. 0.0066 mol Na+ ions
2. 0.120 M KMnO4
3. 5.61 g (6 grams KMnO4)
4. 139 mL CaCl25. 0.44 g NaCl
6. a) 207 g Ca3(PO4)2
b) Na3PO4
c) 0.0340M
7. 49.2 %
![Page 3: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/3.jpg)
Diluting a Stock Solution
To make a solution LESS Concentrated:Add solventNumber of moles of solute does not changeUse formula: M1V1 = M2V2
![Page 4: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/4.jpg)
Molarity
Molarity = concentration term used to describe an amount of solute dissolved in a given amount of solution
Stock solution = concentrated solution. This contains large quantities of solute dissolved in solution
Dilute solution = contains small amounts of solute dissolved in solution
![Page 5: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/5.jpg)
Molarity
Take 2.00 grams of CuSO4 and dissolve it into 100. mL of water.
Calculate the molarity (M) of the stock solution.
0.125 M CuSO4 = stock solution How was the stock solution prepared?
![Page 6: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/6.jpg)
Preparation of Stock Solution
1. Weigh out 2.00 grams of copper(II) sulfate
2. Fill a 100. mL volumetric flask approximately ½ way with water.
3. Add in the solute (2.00 g)
4. Agitate until solute is completely dissolved.
5. Add water (solvent) until the solution reaches the line (score mark).
![Page 7: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/7.jpg)
Preparation of diluted solution
Take 3.00 mL of the stock solution and add it to a 25 mL volumetric flask; dilute to the line.
What is the molarity (M) of the diluted solution?
Use this formula: M1V1 = M2V2
![Page 8: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/8.jpg)
Dilution
M1 = 0.125 M
V1 = 3 mL
M2 = ?
V2 = 25 mL
M2 = 0.0150 M How was the dilution prepared?
![Page 9: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/9.jpg)
Preparation of diluted solution
Take 3.00 mL of the stock solution using a volumetric pipette.
Add to a 25 mL volumetric flask. Dilute with water until the solution reaches
the line. Mix the solution.
![Page 10: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/10.jpg)
Molarity and Dilution
1. 0.031 M
2. 5 Liters
3. 0.76 L
4.24 L evaporated
4. 102 gramsBy Monday – fish will die – you must come in! (0.0366 M)
5. a. Bert
b. 0.164 M = Hank; 0.193 M = Bert
c. 28 mL
![Page 11: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/11.jpg)
Molarity
M1V1 = M2V2
Prepare 25 mL of 0.35M solution NaHCO3 from a stock solution which is 0.97M. How would you prepare the solution?
![Page 12: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/12.jpg)
Molality (m)
Concentration term that does not contain volume
Amount (mol) of solute / mass (kg) of solvent
SOLVENT not SOLUTION
![Page 13: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/13.jpg)
MOLALITY (molality)
What is the molality of a solution prepared by dissolving 32.0 g of CaCl2 in 217 g of water?
![Page 14: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/14.jpg)
Molarity and Dilution ProblemsProblem 6
a. 94 moles
b. 5.5 L pure alcohol
Problem 7
0.137 M
Problem 8
a. Weigh out 2205 grams of K2Cr2O7. Add it to a 5L volumetric flask that is ½ filled with water. Agitate to dissolve. Fill to the line with water.
b. Take 30. mL of stock solution using a volumetric pipette. Add it to a 450mL volumetric flask. Fill to the line with water. Shake.
![Page 15: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/15.jpg)
Molarity and Dilution Problems
Problem 9
a. 1.2 x 10-6 M
b. 2.08 x 10-6 grams
![Page 16: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/16.jpg)
Mass Percent
% (w/w)Percent ratio as weights
100 X solution of mass
solute of mass
![Page 17: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/17.jpg)
Mass Percent
Mass percent = g solute x 100
(g solute + g solvent)
Mass percent = g solute x 100
g solution
![Page 18: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/18.jpg)
Mass %
What is the mass percent of sodium hydroxide in a solution that is made by dissolving 8.00 g NaOH in 50.0 g H2O?
![Page 19: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/19.jpg)
Mass %
What masses of potassium chloride and water are needed to make 250. g of 5.00% solution?
![Page 20: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/20.jpg)
VOLUME PERCENT
% v/vPercent volumes most often used
for liquids and gases
100 X solution of Volume
solute of Volume
![Page 21: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/21.jpg)
Concentration in Parts per volume
The label on a 0.750-L bottle of Italian chiante indicates “11.5% alcohol by volume.” How many liters of alcohol does the wine contain?
![Page 22: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/22.jpg)
% By Volume
What is the % by volume of ethanol (C2H6O) in the final solution when 75 mL of ethanol is diluted to a volume of 250 mL with water?
![Page 23: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/23.jpg)
Homework
Read Pages: 477-479 WS: 17B Properties of solutions Chapter 17 Practice Exam – For your review Quiz Thurs/Fri May 27and 28 Test June 7/8 Mon / Tuesday
![Page 24: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/24.jpg)
ppm (parts per million)
Parts per million (ppm) =
ppm = g solute x 1,000,000
g solution
![Page 25: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/25.jpg)
Concentration in parts by mass
Find the concentration of calcium in parts per million (ppm) in a 3.50 g pill that contains 40.5 mg of Ca
![Page 26: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/26.jpg)
Mole Fraction (Χ)
Χ (chi)Ratio of number of solute moles to
the total number of moles (solute plus solvent)
solvent of mol solute of mol
solute of mol
![Page 27: Today: Quiz Thursday / Friday May 16/17 HW – Read pages 257-258 Worksheet – Concentrations of solutions Worksheet - Molarity Problems 1.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649dfe5503460f94ae65ad/html5/thumbnails/27.jpg)
Mole Fraction
A sample of rubbing alcohol contains 142 g of isopropyl alcohol (C3H7OH) and 58.0 g of water. What are the mole fractions of alcohol and water?