Chemistry 2202 Worksheet - Weebly



Chemistry 2202 Worksheet Concentration

Concentration from Moles and Volume:

1. Copper (II) sulfate is used in copper electroplating cells, and to kill algae in swimming pools and water reservoirs. What is the molar concentration of an electroplating solution in which 1.50 mol of copper (II) sulfate are dissolved to make 2.00 L of solution?

2. What is the molar concentration of a solution in which 0.240 mol of washing soda, Na2SO4 10H2O, is dissolved to make 480 mL of a solution for softening wash water?

3. Iron (II) sulfate is used in making ink. What is the molar concentration of an ink solution that contains 0.210 mol of iron (II) sulfate dissolved to form 840 mL of solution?

4. Since a saturated solution of calcium chloride does not freeze until –550C, calcium chloride can be used to melt ice on roads and walks. What is the molar concentration of a saturated solution in which 35.5 mol of CaCl2 is dissolved in water to make 5.00 L of solution?

5. Sulfuric acid is an important industrial chemical and is used in car batteries. Calculate the molar concentration of a battery acid solution which contains 9.25 mol of H2SO4 dissolved to form 1.80 L of solution.

Concentration from Mass and Volume:

6. Household ammonia often contains 156 g of NH3(g) dissolved in water to form 2.00 L of solution. What is the molar concentration of the household ammonia solution?

7. When 11.0 g of glacial (pure) acetic acid is dissolved in water to make 250.0 mL of vinegar solution, what is the molar concentration of vinegar?

8. What is the molar concentration of 500 mL of a solution that contains 12.7 g of swimming pool chlorinator, Ca(OCl)2?

9. A solution for water proof concrete may be made by dissolving 200 g of ammonium stearate in water to make 5.00 L of solution. Determine the molar concentration of the solution.

10. A car battery terminal protective coating can be made by dissolving 24.0 g of sodium silicate in water to make 250 mL of solution. What is the molar concentration of the solution?

Moles from Volume and Concentration:

11. Sodium bicarbonate is used medicinally to counteract excess stomach acidity. How may moles of solid bicarbonate would be needed to make 100 mL of a 0.600 mol/L solution suitable for use as an antacid?

12. TSP, sodium phosphate, is a useful tile and household cleaner. Find the number of moles of sodium phosphate in 2.00 L of a 0.100 mol/L Na3PO4(aq) cleaning solution prepared for use at home.

13. A rust stain remover may be prepared by dissolving potassium persulfate (K2SO5) in water. How many moles of potassium persulfate are there in 500 mL of a 0.242 mol/L solution suitable for removing rust stains.

14. Hydrochloric acid solutions can be used to remove rust of steal, in etching concrete before painting and preparing articles before galvanizing, electroplating, and tinning. Find the number of moles of hydrogen chloride in 75.0 mL of 0.100 mol/L hydrochloric acid cleaning solution.

15. Common salt, NaCl, has numerous domestic and industrial uses. It is also a source from which many valuable sodium compounds are derived. How many moles of NaCl are needed to prepare 500 mL of saturated 5.30 mol/L solution?

Mass from Volume and Concentration:

16. A toilet bowl cleaner may be prepared by mixing sodium bicarbonate (baking soda) and sodium hydroxide (lye).

a) What mass of lye (NaOH) must be added to a 2.50 L bowl to obtain a 0.075 mol/L solution?

b) What mass of sodium bicarbonate must be added to the bowl if the concentration of sodium bicarbonate must be 0.150 mol/L?

17. Sodium silicate, Na2SiO3, is very soluble in water. Its concentrated solution is sold commercially as water glass. Sodium silicate may be mixed with an equal mass of sodium phosphate and half the mass of sodium metaphosphate to prepare a water softener for dishes and laundry. What mass of sodium silicate is necessary to prepare 10.0 L of a 0.00500 mol/L water softening solution?

18. A hydrate of sodium thiosulfate known as hypo (Na2S2O3 5H2O) is used as a fixer in photography because it readily dissolves silver compounds. What mass is required to make 100 mL of a 0.120 mol/L hypo solution?

Volume from Moles and Concentration:

19. Sodium phosphate may be used to remove scale deposits from a car radiator. What volume of 0.075 mol/L solution would contain the necessary 1.10 mol of sodium phosphate to remove the radiator scales?

20. A perspiration stain remover may be prepared from sodium perborate, NaBO2 H2O2 3H2O. Calculate the volume of 0.600 mol/L perspiration stain remover that would be prepared from 0.300 mol of sodium perborate trihydrate.

21. Caustic soda, NaOH, is useful for dissolving great and matter of plant and animal origin. Calculate the volume of 0.100 mol/L caustic soda solution that contains 3.60 mol of sodium hydroxide.

22. Silver nitrate is used extensively in making photographic plates and films. What volume of 0.320 mol/L silver nitrate solution would contain 0.240 mol of silver nitrate?

23. Sodium bicarbonate is used in baking as baking soda. What volume of solution can be made from 0.821 mol/L saturated solution of sodium bicarbonate using 1.64 mol of solid sodium bicarbonate?

Volume from Mass and Concentration:

24. Chlorine bleach in its solution form is usually sold as a 5% solution of sodium hypochlorite. How many litres of 0.800 mol/L solution would contain 119.2 g of NaOCl?

25. A 0.700 mol/L solution of sodium phosphate makes an efficient cleaner for old brushes hardened with pain. What volume of the solution can be prepared from 126 g of Na3PO4?

26. Corrosion of battery terminals can be prevented by painting the terminals with a protective coating of concentrated sodium silicate, Na2SiO3. What volume of a 8.20 mol/L coating can be prepared from 240 g of sodium silicate?

27. Pots, kettles, frying pans and other non-aluminum household utensils can be cleaned of grease and baked on food by using a solution of lye (NaOH). What volume of this cleaner can be prepared if a 0.100 mol/L solution is made using 10.0 g of solid sodium hydroxide?

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